https://wiki.math.wisc.edu/api.php?action=feedcontributions&user=Nagreen&feedformat=atomUW-Math Wiki - User contributions [en]2022-08-15T07:02:04ZUser contributionsMediaWiki 1.35.6https://wiki.math.wisc.edu/index.php?title=Computer_Help&diff=23300Computer Help2022-06-29T16:19:59Z<p>Nagreen: /* E-mail Web Forms */ changed forms information</p>
<hr />
<div>'''Computer Help'''<br />
This is a guide to the computer facilities, services and software available at the Math department of the University of Wisconsin. Most of the facilities are for department's the faculty, graduate students and staff. <br />
<br />
==How to report an issue==<br />
* https://go.wisc.edu/mathit<br />
<br />
== Accounts and Policies ==<br />
* [[Math Accounts]]<br />
* [[Math Computer Policies]]<br />
* [[Quotas]]<br />
* [[University Computer Policies]]<br />
* [[Math Apps]]<br />
<br />
=== Account Set Up ===<br />
Every person in the math department should be provided the opportunity to set up an account. That account is used for ...<br />
<br />
* computer login for math department computers<br />
* the ability to print to department printers<br />
* file storage on the department file server<br />
* access to math department servers for math software<br />
* the ability to login to various department web pages<br />
<br />
This is different from your WiscMail account, which is used for <br />
<br />
* payroll<br />
* access to Canvas<br />
* access to UW system level IT resources such as Google Apps and UWNet wireless<br />
* your UW wiscmail account<br />
* login to various UW protected webpages hosted throughout the university<br />
* WiscVPN<br />
<br />
==== Changing your Math Dept. Account Password ====<br />
You can reset or change your account password any time:<br />
# Go to [https://web.math.wisc.edu/help/ https://web.math.wisc.edu/help/]<br />
# Click "Forgot Password"<br />
# Click the link you will receive in your email.<br />
<br />
=== Dealing With Spam ===<br />
<br />
The University runs Office 365, which has some spam controls built in. <br />
<br />
There's two parts to the UW's spam control.<br />
<br />
* [https://kb.wisc.edu/page.php?id=53321 The Clutter Folder]<br />
* [https://kb.wisc.edu/page.php?id=45051 The Junk Mail folder]<br />
<br />
Questions regarding these two methods should be directed to the DoIT Help Desk. (264-HELP, 4357)<br />
<br />
=== Vacation Mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=32606 How to set up an auto-reply.] <br />
<br />
=== Forwarding your e-mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=36539 Set/Manage a Forward on a NetID or Service Account]<br />
<br />
=== Leaving the Department ===<br />
If you leave the Math Department, we will occasionally remove old accounts. In some cases, we can leave an account in place for <br />
<br />
#) users that are continuing to collaborate with faculty or staff for research<br />
#) users that wish to continue to receive mail under their math account for a time. <br />
<br />
While we can't guarantee infinite continuation of your email account because that is controlled by DoIT, we do have some methods at our command to make this more streamlined and less prone to being deactivated.<br />
<br />
Generally, we remove accounts in October and March. In most cases, you'll be told in an email that we intend on doing this.<br />
<br />
If you feel you fall under either of the two case scenarios listed above, please email nagreen@math.wisc.edu.<br />
<br />
=== E-mail Web Forms ===<br />
<br />
If you need to have someone contact you via your website, it is better to use a Google Form. <br />
<br />
https://kb.wisc.edu/104251 has information for creating a google form for use in a class, but you can adapt those instructions to create forms for almost any use case. The responses are collected in Google, but you can set up a notification to send you an email when you receive a response.<br />
<br />
== Facilities ==<br />
<br />
The facilities and equipment described below are for use by UW Math department faculty and graduate students on the UW Madison Campus and, preferably, in Van Vleck hall.<br />
<br />
===Mobile Computers and Projectors===<br />
Instructors may borrow laptop computers and projectors for demonstrations in any Van Vleck classroom. This equipment is kept in the AMP Library in Chamberlin Hall. You may check them out for up to 4 hours using your UW ID card. The math library also has an assortment of VGA and HDMI video cables which can be used to connect a PC, Macintosh computer or iPad to a projector. One of the projectors has built in speakers and a DVD player. It also has two microphones which can be connected to it. WARNING: the laptops available for check out are somewhat old and have only basic software (MS Office, TeX) on them. It is far better to use your own computer with the Department's projectors.<br />
<br />
===Ceiling Mounted Projectors===<br />
<br />
Classrooms B102, B107, B130, B215, B231 and B223, B239, the 901 seminar room, and the 911 Lounge each have a ceiling mounted projector. These projectors provide better displays than the mobile units. They can be used with a laptop computer. If you want to reserve one of these rooms, contact Sharon Paulson at paulson@math.wisc.edu. Keep in mind, though, that they're heavily booked and usually only available at the beginning or end of the day.<br />
<br />
The Math Department's computer staff maintain the projectors in 901 and 911. All the others are maintained by the UW Physical Plant. Please contact Derek Dombrowski about them. You will need an access code to use them and a key if you want to use the document camera or microphone with them.<br />
Here is Derek's contact information:<br />
Derek Dombrowski<br />
373A BASCOM HALL<br />
ddombrowski@fpm.wisc.edu<br />
(608) 265-9697<br />
(608) 516-5993<br />
<br />
===Scanners ===<br />
[[Scanners]]<br />
<br />
= Printing =<br />
<br />
==Math Dept Printers==<br />
{| class="wikitable"<br />
! Location<br />
! PrinterName<br />
! Printer Type<br />
|-<br />
|3rd hall<br />
|3<br />
|Ricoh IMC6000<br />
|-<br />
|4th hall<br />
|4<br />
|Ricoh IMC6000<br />
|-<br />
|5th hall<br />
|5<br />
|Ricoh IMC6000<br />
|-<br />
|6th hall<br />
|6<br />
|Ricoh IMC6000<br />
|-<br />
|7th hall<br />
|7<br />
|Ricoh IMC6000<br />
|-<br />
|8th hall<br />
|8<br />
|Ricoh IMC6000<br />
|-<br />
|101B VV<br />
|a<br />
|HP LaserJet 600 M601<br />
|}<br />
<br />
During the summer of 2020, new Ricoh IMC 6000 printers were placed on floors 3-8. We will also switched from LPRNG to CUPS (the Common Unix Printing System) on our unix print servers. <br />
<br />
As of 2014, we stopped charging for overages in printing, but want people to consider carefully the costs of consumables and paper, and the impact on the climate from overuse of paper. Please limit your use of our copiers to fewer than 250 pages a month.<br />
<br />
== Supplies ==<br />
If the printers run out of paper, please get more paper from the Copy Center on the second floor<br />
and place it in the printers. If you are unsure how to do this, ask the computer staff for assistance. For assistance with other problems (no toner, paper jams, etc. ) see Henry Mayes in 507 (for issues with the Ricoh copiers) and Sharon Paulson in 220 (for help with the printers in B127 and 101b). <br />
<br />
See the [http://www.cups.org/ cups guide] for more detailed information on printing with cups.<br />
Click on the links below to learn how to use each function with the Ricoh copiers.<br />
<br />
== Ricoh Copier ==<br />
<br />
[[Ricoh Copier FAQ]]<br />
<br />
Only people with computer accounts in the UW Math Department will be allowed to use the Van Vleck Ricoh copiers. If you have a math account, you will receive a code to use for copying. These <br />
codes will be mailed out once a year in September after old accounts are deleted and new ones added. '''NOTE''': if you forget your copier code, login to one of<br />
the math department linux PCs and type '''whatsmypin'''.<br />
<br />
* You copier code is only required for copying. Although the default display shows the copier login, you do not have to login in order to print or scan. Just push the buttons at the left to select the scanner or printer function.<br />
<br />
* Your code can be used on any of the copiers on floors 3-8. Do not use the copiers on the second floor. They are reserved for the administrative staff.<br />
<br />
* After you have finished copying, do not touch the display. Your login will time out after 60 seconds.<br />
<br />
* Everyone with a math dept account is urged to keep their printing at fewer than 250 pages a month. The Math Department does keep a count of printing totals. You may receive a report each month on your total printing. At the end of the month, these are zeroed out.<br />
<br />
* How to create a multi-page PDF document: Most people will want to create a multipage PDF scan of their document (instead of the default which is a single page TIFF document). To do this press the SCANNER button to the left of the display. Select SEND FILE TYPE/NAME in the left hand column of the display, then select MULTI-PAGE -> PDF<br />
<br />
== Ricoh Printing FAQ ==<br />
* [[Ricoh Printing FAQ]]<br />
* [[Using the Ricoh with Linux]] (command line printing)<br />
* [[Using a Ricoh Printer on a Macintosh]]<br />
* [[Using a Ricoh Printer on a PC]]<br />
* [[Troubleshooting]]<br />
<br />
== Ricoh Scanner FAQ ==<br />
[[Ricoh Scanner FAQ]]<br />
<br />
= Remote Access =<br />
<br />
[https://www.math.wisc.edu/wiki/index.php/Accessing_your_Math_department_network_space | Using ssh, sftp, and Sshfs]<br />
<br />
= TeX/LaTeX =<br />
TeX and LaTeX are supported on the Math Department computers. To learn more about<br />
Typesetting with LaTeX we recommend the following [http://www.latex-project.org/guides/books.html site]. Mediawiki has some support for LaTeX<br />
as the following example shows:<br />
<br />
<math><br />
\int_{[0, 1]^n} <br />
\left| \sum_{k = 1}^n \mathrm{e}^{2 \pi \mathrm{i} \, x_k} \right|^s \mathrm{d}\boldsymbol{x}<br />
</math><br />
<br />
= Unix =<br />
<br />
==Manipulating PDF files ==<br />
<br />
The ''pdftk'' toolkit provides several useful tools for manipulating PDF files without using<br />
Adobe Acrobat Pro. Here are some examples:<br />
<br />
1. This command will split off the first 15 pages of the file NSFProposal.pdf and save it to 'front.pdf'. Substituting 'cat 16-end' for 'cat 1-15' will save the second half of the file.<br />
<br />
pdftk NSFProposal.pdf cat 1-15 output front.pdf<br />
<br />
2. This command will merge two (or more) pdf files:<br />
<br />
pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf<br />
<br />
You can find more examples at [http://www.pdflabs.com/docs/pdftk-cli-examples/ pdftk-examples]<br />
= Troubleshooting =<br />
Answers to some common computer problems<br />
<br />
1. If you forgot the code you need to use the copiers, login to one of the department's linux PCs, open a terminal window and type 'whatsmypin'.<br />
<br />
2. 'Macintosh users'. Sometimes the internet connection on a Mac will <br />
freeze. If this happens, click on the following"<br />
System Preferences -> Network -> DCHP -> Advanced -> renew DHCP lease</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminarindex.html&diff=22951SIAM Student Chapter Seminarindex.html2022-03-09T18:49:24Z<p>Nagreen: Redirected page to SIAM Student Chapter Seminar</p>
<hr />
<div>#REDIRECT [[SIAM_Student_Chapter_Seminar]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminarindex.html&diff=22950SIAM Student Chapter Seminarindex.html2022-03-09T18:49:11Z<p>Nagreen: </p>
<hr />
<div>REDIRECT [[SIAM_Student_Chapter_Seminar]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminarindex.html&diff=22949SIAM Student Chapter Seminarindex.html2022-03-09T18:48:07Z<p>Nagreen: Created page with "This link goes to https://hilbert.math.wisc.edu/wiki/index.php/SIAM_Student_Chapter_Seminar"</p>
<hr />
<div>This link goes to https://hilbert.math.wisc.edu/wiki/index.php/SIAM_Student_Chapter_Seminar</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Math_Computer_Policies&diff=22797Math Computer Policies2022-02-21T18:19:35Z<p>Nagreen: </p>
<hr />
<div>Here are the Official Math Computer Policies<br />
<br />
=== Account Policies ===<br />
<br />
Computer Account Policy<br />
<br />
The following Resolution was proposed and approved by the Mathematics<br />
Department on September 23, 1993 and revised on July, 1998 and August, 2005.<br />
<br />
<br />
1. The computing facilities are for the use of members of the department,<br />
specifically, for Math Department faculty (including emeriti and visitors), <br />
staff, and current graduate students.<br />
<br />
2. Accounts of people no longer members of the department (in the sense of 1.)<br />
will be removed after a suitable grace period to allow them time transfer <br />
their files to their new accounts.<br />
The timetable for removal is given by the following guidelines (3,4,5):<br />
<br />
3. Normally, accounts of people who leave will be deleted on October 1 <br />
following the time of their departure. Former members who need extra time <br />
to relocate may request a temporary 6 month extension of their accounts.<br />
<br />
4. Students who earned their PhDs during the past academic year and Van Vleck<br />
Professors whose appointments have ended may request a 1 year extension of <br />
their accounts. <br />
<br />
5. In special circumstances, someone not a member of the department may<br />
be given temporary access to the departmental computing facilities, for the<br />
purpose of facilitating joint work with a faculty member of the department.<br />
A department member may also request a temporary web site for a math-related<br />
function such as a conference. These web sites should have a clear end date.<br />
The department member involved should contact the IT Manager explaining the <br />
particular need, and will bear full responsibility<br />
for that account. Such accounts and web sites will be reviewed periodically <br />
and terminated with warning when they are no longer active. <br />
<br />
6. In individual cases where the application of 3,4,5 is unclear, the IT Manager will decide when to remove an account.<br />
<br />
=== Web Services and Scripting Policies ===<br />
<br />
<br />
Policy on Web Servers, Web Services<br />
<br />
In order to ensure the security and integrity of<br />
the Van Vleck computer network, all web servers in Van Vleck <br />
will be managed by the Math Department's computer staff. <br />
They will set up and maintain them to make sure that they<br />
meet University security and privacy standards. <br />
<br />
These web servers and the services they offer must serve<br />
legitimate Math Department functions (for example,<br />
instruction, research support and outreach) and<br />
must comply with University policies for appropriate<br />
use and FERPA policies for privacy.<br />
<br />
Forms, if needed, are best accomplished via Google Forms.<br />
[https://sites.google.com/a/wisc.edu/use-cases-for-google-forms/]<br />
<br />
If the web application requires specialized scripts please<br />
confer with the computer staff first.<br />
<br />
=== Laptop Policies ===<br />
<br />
You are welcome to bring your laptop in to the Department in order<br />
to do Mathematical work. However, if you connect it to the network<br />
via either the Wireless network or a cable, you are responsible for<br />
<br />
* Making sure that it is virus and spyware free. University members can pick up a free CD with virus protection software from DoIT or download it [https://it.wisc.edu/services/antivirus-software/ here]<br />
<br />
* The Math Department's computer staff is primarily responsible for installing, maintaining and upgrading the computers in Van Vleck with belong to the Department. They may help you set up your computer initially or troubleshoot hardware and software problems, but '''only if they have extra time'''. [http://www.doit.wisc.edu DoIT] provides computer repair services for a fee.<br />
<br />
=== University Computer Policies ===<br />
<br />
The University of Wisconsin has it's own policies for IT, and we must follow them.<br />
https://policy.wisc.edu<br />
<br />
The Math Department users must also follow these guidelines.<br />
<br />
=== University Computer Policies ===<br />
<br />
The IT staff will occasionally scan for sensitive data on our servers, and may contact users on how to best dispose of sensitive data on their network shares. Sensitive data includes a class of personal identifying information, but in our case is mostly Social Security Numbers. <br />
<br />
It is best to NEVER store a Social Security Number on your electronic media. If one is found on your system, you'll be asked on how you'd prefer to dispose of it; either by deletion or by transferring to an encrypted service such as box.com. Dropbox is not encrypted and not an appropriate storage mechanism for sensitive data. <br />
<br />
If you have questions on what is sensitive data, how we identify sensitive data or anything thing else related to IT security, please ask the IT Staff (staff@math.wisc.edu)</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Math_Accounts&diff=22796Math Accounts2022-02-21T18:15:24Z<p>Nagreen: </p>
<hr />
<div>==Math Department Computer Accounts==<br />
<br />
The Math Department computing facilities are only for the faculty, staff and graduate students of the Math Department. This web site assumes that you are a faculty member or a graduate student of the Math Department.<br />
<br />
You should have been given an authorized Math Department computer account, i.e. a username and password. With an authorized account you're free to use the Math Department's computing facilities described on this site's index page. If you didn't get a username and password, come see the Math Department's computer staff, in room 507 or 515.<br />
<br />
Computer accounts of people no longer members of the Math Department in the above sense will be deleted after a short grace period. During that period, such users can save their user files elsewhere. Here are a few more details on this topic.<br />
<br />
* In exceptional circumstances, someone not a member of the Department may be given temporary access to the departmental computing facilities, for the purpose of facilitating joint work with a faculty member of the Department. The faculty member involved should email the IT Manager (nagreen@math.wisc.edu) explaining the particular need, and will bear full responsibility for that account. Such requests will be reviewed yearly.<br />
* Normally, accounts of people who leave will be deleted on Octber 1 following the time of their departure. Former members who need extra time to relocate may request a temporary (6 month extension) of their accounts.<br />
* Students who earned their PhDs during the past academic year may request a one year extension of their accounts.<br />
* In cases of former Math Department members that don't fit the above guidelines, the IT Manager will decide when to remove an account.<br />
* The Math Department maintains several e-mail lists. Some of them (faculty, graduate, supportstaff) are used primarily to notify people about matters related to their jobs and, hence, users can neither subscribe to nor unsubscribe from these lists. The lists will be reviewed twice a year to make sure that the people on them are members of the Math Department. If someone wants to remain on a list, they may request this from the IT Manager.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Computer_Help&diff=22795Computer Help2022-02-21T18:13:23Z<p>Nagreen: /* Accounts and Policies */</p>
<hr />
<div>'''Computer Help'''<br />
This is a guide to the computer facilities, services and software available at the Math department of the University of Wisconsin. Most of the facilities are for department's the faculty, graduate students and staff. <br />
<br />
==How to report an issue==<br />
* https://go.wisc.edu/mathit<br />
<br />
== Accounts and Policies ==<br />
* [[Math Accounts]]<br />
* [[Math Computer Policies]]<br />
* [[Quotas]]<br />
* [[University Computer Policies]]<br />
* [[Math Apps]]<br />
<br />
=== Account Set Up ===<br />
Every person in the math department should be provided the opportunity to set up an account. That account is used for ...<br />
<br />
* computer login for math department computers<br />
* the ability to print to department printers<br />
* file storage on the department file server<br />
* access to math department servers for math software<br />
* the ability to login to various department web pages<br />
<br />
This is different from your WiscMail account, which is used for <br />
<br />
* payroll<br />
* access to Canvas<br />
* access to UW system level IT resources such as Google Apps and UWNet wireless<br />
* your UW wiscmail account<br />
* login to various UW protected webpages hosted throughout the university<br />
* WiscVPN<br />
<br />
=== Dealing With Spam ===<br />
<br />
The University runs Office 365, which has some spam controls built in. <br />
<br />
There's two parts to the UW's spam control.<br />
<br />
* the Clutter Folder [https://kb.wisc.edu/page.php?id=53321]<br />
* the Junk Mail folder [https://kb.wisc.edu/page.php?id=45051]<br />
<br />
Questions regarding these two methods should be directed to the DoIT Help Desk. (264-HELP, 4357)<br />
<br />
=== Vacation Mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=32606] How to set up an auto-reply. <br />
<br />
=== Forwarding your e-mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=36539]<br />
<br />
=== Leaving the Department ===<br />
If you leave the Math Department, we will occasionally remove old accounts. In some cases, we can leave an account in place for <br />
<br />
#) users that are continuing to collaborate with faculty or staff for research<br />
#) users that wish to continue to receive mail under their math account for a time. <br />
<br />
While we can't guarantee infinite continuation of your email account because that is controlled by DoIT, we do have some methods at our command to make this more streamlined and less prone to being deactivated.<br />
<br />
Generally, we remove accounts in October and March. In most cases, you'll be told in an email that we intend on doing this.<br />
<br />
If you feel you fall under either of the two case scenarios listed above, please email nagreen@math.wisc.edu.<br />
<br />
=== E-mail Web Forms ===<br />
<br />
You can create a web page in your server space.<br />
Here's how: [https://sites.google.com/a/wisc.edu/math-intranet/home/computing/html]<br />
<br />
== '''Facilities''' ==<br />
<br />
The facilities and equipment described below are for use by UW Math department faculty and graduate students on the UW Madison Campus and, preferably, in Van Vleck hall.<br />
<br />
* '''Mobile Computers and Projectors''' <br><br />
Instructors may borrow laptop computers and projectors for demonstrations in any Van Vleck classroom. This equipment is kept in the AMP Library in Chamberlin Hall. You may check them out for up to 4 hours using your UW ID card. The math library also has an assortment of VGA and HDMI video cables which can be used to connect a PC, Macintosh computer or iPad to a projector. One of the projectors has built in speakers and a DVD player. It also has two microphones which can be connected to it. WARNING: the laptops available for check out are somewhat old and have only basic software (MS Office, TeX) on them. It is far better to use your own computer with the Department's projectors.<br />
<br />
* '''Ceiling Mounted Projectors''' <br><br />
<br />
Classrooms B102, B107, B130, B215, B231 and B223, B239, the 901 seminar room, and the 911 Lounge each have a ceiling mounted projector. These projectors provide better displays than the mobile units. They can be used with a laptop computer. If you want to reserve one of these rooms, contact Sharon Paulson at paulson@math.wisc.edu. Keep in mind, though, that they're heavily booked and usually only available at the beginning or end of the day.<br />
<br />
The Math Department's computer staff maintain the projectors in 901 and 911. All the others are maintained by the UW Physical Plant. Please contact Derek Dombrowski about them. You will need an access code to use them and a key if you want to use the document camera or microphone with them.<br />
Here is Derek's contact information:<br />
Derek Dombrowski<br />
373A BASCOM HALL<br />
ddombrowski@fpm.wisc.edu<br />
(608) 265-9697<br />
(608) 516-5993<br />
<br />
* [[Scanners]]<br />
<br />
= Printing =<br />
<br />
Math Dept Printers<br />
{|<br />
! Location<br />
! PrinterName<br />
! Printer Type<br />
|-<br />
|3rd hall<br />
|3<br />
|Ricoh IMC6000<br />
|-<br />
|4th hall<br />
|4<br />
|Ricoh IMC6000<br />
|-<br />
|5th hall<br />
|5<br />
|Ricoh IMC6000<br />
|-<br />
|6th hall<br />
|6<br />
|Ricoh IMC6000<br />
|-<br />
|7th hall<br />
|7<br />
|Ricoh IMC6000<br />
|-<br />
|8th hall<br />
|8<br />
|Ricoh IMC6000<br />
|-<br />
|101B VV<br />
|a<br />
|HP LaserJet 600 M601<br />
|}<br />
<br />
During the summer of 2020, new Ricoh IMC 6000 printers were placed on floors 3-8. We will also switched from LPRNG to CUPS (the Common Unix Printing System) on our unix print servers. <br />
<br />
As of 2014, we stopped charging for overages in printing, but want people to consider carefully the costs of consumables and paper, and the impact on the climate from overuse of paper. Please limit your use of our copiers to fewer than 250 pages a month.<br />
<br />
== Supplies ==<br />
If the printers run out of paper, please get more paper from the Copy Center on the second floor<br />
and place it in the printers. If you are unsure how to do this, ask the computer staff for assistance. For assistance with other problems (no toner, paper jams, etc. ) see Henry Mayes in 507 (for issues with the Ricoh copiers) and Sharon Paulson in 220 (for help with the printers in B127 and 101b). <br />
<br />
See the [http://www.cups.org/ cups guide] for more detailed information on printing with cups.<br />
Click on the links below to learn how to use each function with the Ricoh copiers.<br />
<br />
== [[Ricoh Copier FAQ]] ==<br />
<br />
Only people with computer accounts in the UW Math Department will be allowed to use the Van Vleck Ricoh copiers. If you have a math account, you will receive a code to use for copying. These <br />
codes will be mailed out once a year in September after old accounts are deleted and new ones added. '''NOTE''': if you forget your copier code, login to one of<br />
the math department linux PCs and type '''whatsmypin'''.<br />
<br />
1. You copier code is only required for copying. Although the<br />
default display shows the copier login, you do not have to login<br />
in order to print or scan. Just push the buttons at the left<br />
to select the scanner or printer function.<br />
<br />
2. Your code can be used on any of the copiers on floors 3-8.<br />
Do not use the copiers on the second floor. They are reserved<br />
for the administrative staff.<br />
<br />
3. After you have finished copying, do not touch the display.<br />
Your login will time out after 60 seconds.<br />
<br />
4. Everyone with a math dept account is urged to keep their printing <br />
at fewer than 250 pages a month. The Math Department does keep a count of <br />
printing totals. You may receive a report each month on your total printing. <br />
At the end of the month, these are zeroed out.<br />
<br />
5. How to create a multi-page PDF document: Most people will want<br />
to create a multipage PDF scan of their document (instead of the <br />
default which is a single page TIFF document). To do this press the<br />
SCANNER button to the left of the display. Select SEND FILE TYPE/NAME<br />
in the left hand column of the display, then select MULTI-PAGE -> PDF<br />
<br />
== [[Ricoh Printing FAQ]] ==<br />
<br />
* [[Using the Ricoh with Linux]] (command line printing)<br />
* [[Using a Ricoh Printer on a Macintosh]]<br />
* [[Using a Ricoh Printer on a PC]]<br />
* [[Troubleshooting]]<br />
<br />
== [[Ricoh Scanner FAQ]] ==<br />
<br />
= Remote Access =<br />
<br />
[https://www.math.wisc.edu/wiki/index.php/Accessing_your_Math_department_network_space | Using ssh, sftp, and Sshfs]<br />
<br />
= TeX/LaTeX =<br />
TeX and LaTeX are supported on the Math Department computers. To learn more about<br />
Typesetting with LaTeX we recommend the following [http://www.latex-project.org/guides/books.html site]. Mediawiki has some support for LaTeX<br />
as the following example shows:<br />
<br />
<math><br />
\int_{[0, 1]^n} <br />
\left| \sum_{k = 1}^n \mathrm{e}^{2 \pi \mathrm{i} \, x_k} \right|^s \mathrm{d}\boldsymbol{x}<br />
</math><br />
<br />
= Unix =<br />
<br />
==Manipulating PDF files ==<br />
<br />
The ''pdftk'' toolkit provides several useful tools for manipulating PDF files without using<br />
Adobe Acrobat Pro. Here are some examples:<br />
<br />
1. This command will split off the first 15 pages of the file NSFProposal.pdf and save it to 'front.pdf'. Substituting 'cat 16-end' for 'cat 1-15' will save the second half of the file.<br />
<br />
pdftk NSFProposal.pdf cat 1-15 output front.pdf<br />
<br />
2. This command will merge two (or more) pdf files:<br />
<br />
pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf<br />
<br />
You can find more examples at [http://www.pdflabs.com/docs/pdftk-cli-examples/ pdftk-examples]<br />
= Troubleshooting =<br />
Answers to some common computer problems<br />
<br />
1. If you forgot the code you need to use the copiers, login to one of the department's linux PCs, open a terminal window and type 'whatsmypin'.<br />
<br />
2. 'Macintosh users'. Sometimes the internet connection on a Mac will <br />
freeze. If this happens, click on the following"<br />
System Preferences -> Network -> DCHP -> Advanced -> renew DHCP lease<br />
<br />
3. [[Moving back to Debian from Ubuntu]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Computer_Help&diff=22793Computer Help2022-02-21T15:07:30Z<p>Nagreen: /* COVID Computing */</p>
<hr />
<div>'''Computer Help'''<br />
This is a guide to the computer facilities, services and software available at the Math department of the University of Wisconsin. Most of the facilities are for department's the faculty, graduate students and staff. <br />
<br />
==How to report an issue==<br />
* https://go.wisc.edu/mathit<br />
<br />
== Accounts and Policies ==<br />
* [[Math Accounts]]<br />
* [[Math Computer Policies]]<br />
* [[Quotas]]<br />
* [[University Computer Policies]]<br />
* [[Math Apps]]<br />
<br />
=== Account Set Up ===<br />
Every person in the math department should be provided the opportunity to set up an account. That account is used for ...<br />
<br />
* computer login for math department computers<br />
* the ability to print to department printers<br />
* file storage on the department file server<br />
* access to math department servers for math software<br />
* the ability to login to various department web pages<br />
<br />
This is different from your WiscMail account, which is used for <br />
<br />
* payroll<br />
* access to Canvas<br />
* access to UW system level IT resources such as Google Apps and UWNet wireless<br />
* your UW wiscmail account<br />
* login to various UW protected webpages hosted throughout the university<br />
* WiscVPN<br />
<br />
To set up your IMAP email client<br />
<br />
go to [https://kb.wisc.edu/page.php?id=28350]<br />
<br />
If you have problems with this, please let us know: staff@math.wisc.edu<br />
<br />
=== Dealing With Spam ===<br />
<br />
The University runs Office 365, which has some spam controls built in. <br />
<br />
There's two parts to the UW's spam control.<br />
<br />
* the Clutter Folder [https://kb.wisc.edu/page.php?id=53321]<br />
* the Junk Mail folder [https://kb.wisc.edu/page.php?id=45051]<br />
<br />
Questions regarding these two methods should be directed to the DoIT Help Desk. (264-HELP, 4357)<br />
<br />
=== Vacation Mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=32606]Head over to the UW KB.<br />
<br />
=== Forwarding your e-mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=36539]<br />
<br />
=== Leaving the Department ===<br />
If you leave the Math Department, we will occasionally remove old accounts. In some cases, we can leave an account in place for <br />
<br />
#) users that are continuing to collaborate with faculty or staff for research<br />
#) users that wish to continue to receive mail under their math account for a time. <br />
<br />
While we can't guarantee infinite continuation of your email account because that is controlled by DoIT, we do have some methods at our command to make this more streamlined and less prone to being deactivated.<br />
<br />
Generally, we remove accounts in October and March. In most cases, you'll be told in an email that we intend on doing this.<br />
<br />
If you feel you fall under either of the two case scenarios listed above, please email nagreen@math.wisc.edu.<br />
<br />
=== E-mail Web Forms ===<br />
<br />
You can create a web page in your server space.<br />
Here's how: [https://sites.google.com/a/wisc.edu/math-intranet/home/computing/html]<br />
<br />
== '''Facilities''' ==<br />
<br />
The facilities and equipment described below are for use by UW Math department faculty and graduate students on the UW Madison Campus and, preferably, in Van Vleck hall.<br />
<br />
* '''Mobile Computers and Projectors''' <br><br />
Instructors may borrow laptop computers and projectors for demonstrations in any Van Vleck classroom. This equipment is kept in the AMP Library in Chamberlin Hall. You may check them out for up to 4 hours using your UW ID card. The math library also has an assortment of VGA and HDMI video cables which can be used to connect a PC, Macintosh computer or iPad to a projector. One of the projectors has built in speakers and a DVD player. It also has two microphones which can be connected to it. WARNING: the laptops available for check out are somewhat old and have only basic software (MS Office, TeX) on them. It is far better to use your own computer with the Department's projectors.<br />
<br />
* '''Ceiling Mounted Projectors''' <br><br />
<br />
Classrooms B102, B107, B130, B215, B231 and B223, B239, the 901 seminar room, and the 911 Lounge each have a ceiling mounted projector. These projectors provide better displays than the mobile units. They can be used with a laptop computer. If you want to reserve one of these rooms, contact Sharon Paulson at paulson@math.wisc.edu. Keep in mind, though, that they're heavily booked and usually only available at the beginning or end of the day.<br />
<br />
The Math Department's computer staff maintain the projectors in 901 and 911. All the others are maintained by the UW Physical Plant. Please contact Derek Dombrowski about them. You will need an access code to use them and a key if you want to use the document camera or microphone with them.<br />
Here is Derek's contact information:<br />
Derek Dombrowski<br />
373A BASCOM HALL<br />
ddombrowski@fpm.wisc.edu<br />
(608) 265-9697<br />
(608) 516-5993<br />
<br />
* [[Scanners]]<br />
<br />
= Printing =<br />
<br />
Math Dept Printers<br />
{|<br />
! Location<br />
! PrinterName<br />
! Printer Type<br />
|-<br />
|3rd hall<br />
|3<br />
|Ricoh IMC6000<br />
|-<br />
|4th hall<br />
|4<br />
|Ricoh IMC6000<br />
|-<br />
|5th hall<br />
|5<br />
|Ricoh IMC6000<br />
|-<br />
|6th hall<br />
|6<br />
|Ricoh IMC6000<br />
|-<br />
|7th hall<br />
|7<br />
|Ricoh IMC6000<br />
|-<br />
|8th hall<br />
|8<br />
|Ricoh IMC6000<br />
|-<br />
|101B VV<br />
|a<br />
|HP LaserJet 600 M601<br />
|}<br />
<br />
During the summer of 2020, new Ricoh IMC 6000 printers were placed on floors 3-8. We will also switched from LPRNG to CUPS (the Common Unix Printing System) on our unix print servers. <br />
<br />
As of 2014, we stopped charging for overages in printing, but want people to consider carefully the costs of consumables and paper, and the impact on the climate from overuse of paper. Please limit your use of our copiers to fewer than 250 pages a month.<br />
<br />
== Supplies ==<br />
If the printers run out of paper, please get more paper from the Copy Center on the second floor<br />
and place it in the printers. If you are unsure how to do this, ask the computer staff for assistance. For assistance with other problems (no toner, paper jams, etc. ) see Henry Mayes in 507 (for issues with the Ricoh copiers) and Sharon Paulson in 220 (for help with the printers in B127 and 101b). <br />
<br />
See the [http://www.cups.org/ cups guide] for more detailed information on printing with cups.<br />
Click on the links below to learn how to use each function with the Ricoh copiers.<br />
<br />
== [[Ricoh Copier FAQ]] ==<br />
<br />
Only people with computer accounts in the UW Math Department will be allowed to use the Van Vleck Ricoh copiers. If you have a math account, you will receive a code to use for copying. These <br />
codes will be mailed out once a year in September after old accounts are deleted and new ones added. '''NOTE''': if you forget your copier code, login to one of<br />
the math department linux PCs and type '''whatsmypin'''.<br />
<br />
1. You copier code is only required for copying. Although the<br />
default display shows the copier login, you do not have to login<br />
in order to print or scan. Just push the buttons at the left<br />
to select the scanner or printer function.<br />
<br />
2. Your code can be used on any of the copiers on floors 3-8.<br />
Do not use the copiers on the second floor. They are reserved<br />
for the administrative staff.<br />
<br />
3. After you have finished copying, do not touch the display.<br />
Your login will time out after 60 seconds.<br />
<br />
4. Everyone with a math dept account is urged to keep their printing <br />
at fewer than 250 pages a month. The Math Department does keep a count of <br />
printing totals. You may receive a report each month on your total printing. <br />
At the end of the month, these are zeroed out.<br />
<br />
5. How to create a multi-page PDF document: Most people will want<br />
to create a multipage PDF scan of their document (instead of the <br />
default which is a single page TIFF document). To do this press the<br />
SCANNER button to the left of the display. Select SEND FILE TYPE/NAME<br />
in the left hand column of the display, then select MULTI-PAGE -> PDF<br />
<br />
== [[Ricoh Printing FAQ]] ==<br />
<br />
* [[Using the Ricoh with Linux]] (command line printing)<br />
* [[Using a Ricoh Printer on a Macintosh]]<br />
* [[Using a Ricoh Printer on a PC]]<br />
* [[Troubleshooting]]<br />
<br />
== [[Ricoh Scanner FAQ]] ==<br />
<br />
= Remote Access =<br />
<br />
[https://www.math.wisc.edu/wiki/index.php/Accessing_your_Math_department_network_space | Using ssh, sftp, and Sshfs]<br />
<br />
= TeX/LaTeX =<br />
TeX and LaTeX are supported on the Math Department computers. To learn more about<br />
Typesetting with LaTeX we recommend the following [http://www.latex-project.org/guides/books.html site]. Mediawiki has some support for LaTeX<br />
as the following example shows:<br />
<br />
<math><br />
\int_{[0, 1]^n} <br />
\left| \sum_{k = 1}^n \mathrm{e}^{2 \pi \mathrm{i} \, x_k} \right|^s \mathrm{d}\boldsymbol{x}<br />
</math><br />
<br />
= Unix =<br />
<br />
==Manipulating PDF files ==<br />
<br />
The ''pdftk'' toolkit provides several useful tools for manipulating PDF files without using<br />
Adobe Acrobat Pro. Here are some examples:<br />
<br />
1. This command will split off the first 15 pages of the file NSFProposal.pdf and save it to 'front.pdf'. Substituting 'cat 16-end' for 'cat 1-15' will save the second half of the file.<br />
<br />
pdftk NSFProposal.pdf cat 1-15 output front.pdf<br />
<br />
2. This command will merge two (or more) pdf files:<br />
<br />
pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf<br />
<br />
You can find more examples at [http://www.pdflabs.com/docs/pdftk-cli-examples/ pdftk-examples]<br />
= Troubleshooting =<br />
Answers to some common computer problems<br />
<br />
1. If you forgot the code you need to use the copiers, login to one of the department's linux PCs, open a terminal window and type 'whatsmypin'.<br />
<br />
2. 'Macintosh users'. Sometimes the internet connection on a Mac will <br />
freeze. If this happens, click on the following"<br />
System Preferences -> Network -> DCHP -> Advanced -> renew DHCP lease<br />
<br />
3. [[Moving back to Debian from Ubuntu]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=22651SIAM Student Chapter Seminar2022-02-03T18:33:02Z<p>Nagreen: </p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' Mondays at 4 PM<br />
*'''Where:''' See list of talks below <br />
*'''Organizers:''' [https://sites.google.com/wisc.edu/evan-sorensen Evan Sorensen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
==Spring 2022==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Feb 7, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 14, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 21, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
<br />
|}<br />
<br />
<br />
== Abstracts ==<br />
<br />
=== Feb 7 ===<br />
<br />
<br />
=== Feb 14 ===<br />
<br />
=== Feb 21 ===<br />
<br />
<br />
== Past Semesters ==<br />
*[[SIAM Student Chapter Seminar/Fall2021|Fall 2021]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar/Fall2021&diff=22650SIAM Student Chapter Seminar/Fall20212022-02-03T18:31:30Z<p>Nagreen: /* Fall 2021 */</p>
<hr />
<div>== Fall 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Sept 20, 4 PM<br />
| Ingraham 214<br />
| [https://sites.google.com/view/julialindberg/home/ Julia Lindberg] (Electrical and Computer Engineering)<br />
|''[[#Sept 20, Julia Lindberg |Polynomial system solving in applications]]''<br />
|-<br />
|-<br />
| Sept 27, 4 PM, <br />
| Zoom (refreshments and conference call in 307)<br />
| Wil Cocke (Developer for [https://www.arcyber.army.mil/ ARCYBER])<br />
| ''[[#Sept 27, Wil Cocke |Job talk-Software Development/Data Science]]''<br />
|<br />
|-<br />
|-<br />
| Oct 4, '''2:45 PM'''<br />
| B119 Van Vleck<br />
| [https://sites.google.com/wisc.edu/nair-anjali/home/ Anjali Nair] (Math)<br />
| ''[[#Oct 4, Anjali Nair|Reconstruction of Reflection Coefficients Using the Phonon Transport Equation]]''<br />
|<br />
|-<br />
|-<br />
| Oct 18, 4 PM<br />
| 6104 Social Sciences<br />
| [https://jasonltorchinsky.github.io/ Jason Tochinsky] (Math)<br />
| ''[[#Oct 18, Jason Torchinsky|Improving the Vertical Remapping Algorithm in the Department of Energy’s Energy Exascale Earth Systems Model]]''<br />
|<br />
|-<br />
|-<br />
| Oct 25, 4 PM,<br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/patricktbardsley/ Patrick Bardsley] (Senior Machine Learning Engineer at [https://www.cirrus.com/ Cirrus Logic])<br />
| ''[[#Oct 25, Patrick Bardsley|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 8, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/libanmohamed496/ Liban Mohamed] (Machine Learning Engineer at [https://www.mitre.org/ MITRE])<br />
| ''[[#Nov 8, Liban Mohamed|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 15, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/kurt-ehlert-320b8397/ Kurt Ehlert] (Trading Strategy Developer at [https://auros.global/about/ Auros])<br />
| ''[[#Nov 15, Kurt Ehlert|Job Talk-Cryptocurrency Trading]]''<br />
|<br />
|-<br />
|-<br />
| Nov 29, 4 PM<br />
| 9th floor lounge<br />
| [https://people.math.wisc.edu/~boakley/ Bryan Oakley] (Math)<br />
| ''[[#Nov 29, Bryan Oakley|Optimal Spatially Dependent Diffusion]]''<br />
|<br />
|-<br />
|-<br />
| Dec 6, 4 PM<br />
| 9th floor lounge<br />
| [https://sites.google.com/view/hongxuchen/ Hongxu Chen] (Math)<br />
| ''[[#Dec 6, Hongxu Chen|Boltzmann equation with Cercignani-Lampis boundary]]''<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== Sept 20, Julia Lindberg===<br />
Polynomial systems arise naturally in many applications in engineering and the sciences. This talk will outline classes of homotopy continuation algorithms used to solve them. I will then describe ways in which structures such as irreducibility, symmetry and sparsity can be used to improve computational speed. The efficacy of these algorithms will be demonstrated on systems in power systems engineering, statistics and optimization<br />
<br />
<br />
=== Sept 27, Wil Cocke ===<br />
I mostly work as a software developer with an emphasis on data science projects dealing with various Command specific projects. The data science life-cycle is fairly consistent across industries: collect, clean, explore, model, interpret, and repeat with a goal of providing insight to the organization. During my talk, I will share some lessons learned for mathematicians interested in transitioning to software development/ data science. <br />
<br />
<br />
=== Oct 4, Anjali Nair ===<br />
The phonon transport equation is used to model heat conduction in solid materials. I will talk about how we use it to solve an inverse problem to reconstruct the thermal reflection coefficient at an interface. This takes the framework of a PDE constrained optimization problem, and I will also mention the stochastic methods used to solve it.<br />
<br />
<br />
=== Oct 18, Jason Torchinsky ===<br />
A vertical Lagrangian coordinate has been used in global climate models for nearly two decades and has several advantages over other discretizations, including reducing the dimensionality of the physical problem. As the Lagrangian surfaces deform over time, it is necessary to accurately and conservatively remap the vertical Lagrangian coordinate back to a fixed Eulerian coordinate. A popular choice of remapping algorithm is the piecewise parabolic method, a modified version of which is used in the atmospheric component of the Department of Energy's Energy Exascale Earth System Model. However, this version of the remapping algorithm creates unwanted noise at the model top and planetary surface for several standard test cases. We explore four alternative modifications to the algorithm and show that the most accurate of these eliminates this noise. <br />
<br />
<br />
=== Oct 25, Patrick Bardsley ===<br />
During the course of a PhD, students typically enter a proverbial `coal mine’ to extract new information about one or more problems, and in the process become a domain expert in a small niche of the technical and scientific world. Upon leaving the academy, unless one lands a job in their niche domain, much of their problem- and domain-specific knowledge is no longer essential. However, mathematics is broad and general, arguably the most general of all scientific disciplines. This fact alone is a mathematician’s greatest asset and ‘leg-up’ when entering the industrial workforce. In this talk, I will discuss some details of my work, both inside and outside of the academy, with the goal of highlighting the skills and concepts that have been the most general and transferable for me. For example, my academic work on hyperbolic inverse problems helped me learn signal processing concepts I now use daily, while my studies on polycrystalline grain growth pushed me to learn thermodynamics, which translated well to the information theory concepts I now utilize. I will also give you some idea of my current day-to-day responsibilities, and close with my thoughts and suggestions on job searches.<br />
<br />
<br />
=== Nov 8, Liban Mohamed ===<br />
I work as a researcher at MITRE, a company that manages R&D contracts (FFRDCs) with federal agencies. I am nominally a machine learning engineer, but my department supports a diverse array of initiatives with the IRS. In this talk I'll give an overview of the FFRDC space, give a sketch of what I work on and how I spend my time, and share my thoughts about navigating the transition from academia to industry.<br />
<br />
<br />
=== Nov 15, Kurt Ehlert ===<br />
After graduating from the UW, I ventured into the world of trading. My first job was at Virtu, a high-frequency market-maker, and currently I work at Auros, which is a high-frequency trading firm that focuses on cryptocurrencies. During the talk, I will give an overview of the industry, job market, and interview process from the perspective of a "quant". Then I will describe the day-to-day work and give a high-level description of typical projects. <br />
<br />
<br />
=== Nov 29, Bryan Oakley ===<br />
The solution to the diffusion equation is known to converge exponentially to its steady state, and the rate is given by the spectral gap of the elliptic operator. Using variational techniques, we will maximize the spectral gap over choices of spatially dependent diffusion functions. Using this characterization, we can obtain bounds on the optimal rate of convergence.<br />
<br />
=== Dec 6, Hongxu Chen ===<br />
Boltzmann equation is a fundamental kinetic equation that describes the dynamics of dilute gas. In this talk I will focus on the boundary value problem of the Boltzmann equation and introduce the Cercignani-Lampis boundary, which is a physical boundary that describes the intermediate reflection law between diffuse reflection and specular reflection. <br />
<br />
<br />
<br />
<br></div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar/Fall2021&diff=22649SIAM Student Chapter Seminar/Fall20212022-02-03T18:30:57Z<p>Nagreen: Created page with "== Fall 2021 == {| cellpadding="8" !align="left" | date and time !align="left" | location !align="left" | speaker !align="left" | title |- | Sept 20, 4 PM | Ingraham 214 | [..."</p>
<hr />
<div>== Fall 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Sept 20, 4 PM<br />
| Ingraham 214<br />
| [https://sites.google.com/view/julialindberg/home/ Julia Lindberg] (Electrical and Computer Engineering)<br />
|''[[#Sept 20, Julia Lindberg |Polynomial system solving in applications]]''<br />
|-<br />
|-<br />
| Sept 27, 4 PM, <br />
| Zoom (refreshments and conference call in 307)<br />
| Wil Cocke (Developer for [https://www.arcyber.army.mil/ ARCYBER])<br />
| ''[[#Sept 27, Wil Cocke |Job talk-Software Development/Data Science]]''<br />
|<br />
|-<br />
|-<br />
| Oct 4, '''2:45 PM'''<br />
| B119 Van Vleck<br />
| [https://sites.google.com/wisc.edu/nair-anjali/home/ Anjali Nair] (Math)<br />
| ''[[#Oct 4, Anjali Nair|Reconstruction of Reflection Coefficients Using the Phonon Transport Equation]]''<br />
|<br />
|-<br />
|-<br />
| Oct 18, 4 PM<br />
| 6104 Social Sciences<br />
| [https://jasonltorchinsky.github.io/ Jason Tochinsky] (Math)<br />
| ''[[#Oct 18, Jason Torchinsky|Improving the Vertical Remapping Algorithm in the Department of Energy’s Energy Exascale Earth Systems Model]]''<br />
|<br />
|-<br />
|-<br />
| Oct 25, 4 PM,<br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/patricktbardsley/ Patrick Bardsley] (Senior Machine Learning Engineer at [https://www.cirrus.com/ Cirrus Logic])<br />
| ''[[#Oct 25, Patrick Bardsley|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 8, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/libanmohamed496/ Liban Mohamed] (Machine Learning Engineer at [https://www.mitre.org/ MITRE])<br />
| ''[[#Nov 8, Liban Mohamed|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 15, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/kurt-ehlert-320b8397/ Kurt Ehlert] (Trading Strategy Developer at [https://auros.global/about/ Auros])<br />
| ''[[#Nov 15, Kurt Ehlert|Job Talk-Cryptocurrency Trading]]''<br />
|<br />
|-<br />
|-<br />
| Nov 29, 4 PM<br />
| 9th floor lounge<br />
| [https://people.math.wisc.edu/~boakley/ Bryan Oakley] (Math)<br />
| ''[[#Nov 29, Bryan Oakley|Optimal Spatially Dependent Diffusion]]''<br />
|<br />
|-<br />
|-<br />
| Dec 6, 4 PM<br />
| 9th floor lounge<br />
| [https://sites.google.com/view/hongxuchen/ Hongxu Chen] (Math)<br />
| ''[[#Dec 6, Hongxu Chen|Boltzmann equation with Cercignani-Lampis boundary]]''<br />
|}</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=22648SIAM Student Chapter Seminar2022-02-03T18:30:36Z<p>Nagreen: /* Past Semesters */</p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' Mondays at 4 PM<br />
*'''Where:''' See list of talks below <br />
*'''Organizers:''' [https://sites.google.com/wisc.edu/evan-sorensen Evan Sorensen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
==Spring 2022==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Feb 7, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 14, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 21, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
<br />
|}<br />
<br />
== Fall 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Sept 20, 4 PM<br />
| Ingraham 214<br />
| [https://sites.google.com/view/julialindberg/home/ Julia Lindberg] (Electrical and Computer Engineering)<br />
|''[[#Sept 20, Julia Lindberg |Polynomial system solving in applications]]''<br />
|-<br />
|-<br />
| Sept 27, 4 PM, <br />
| Zoom (refreshments and conference call in 307)<br />
| Wil Cocke (Developer for [https://www.arcyber.army.mil/ ARCYBER])<br />
| ''[[#Sept 27, Wil Cocke |Job talk-Software Development/Data Science]]''<br />
|<br />
|-<br />
|-<br />
| Oct 4, '''2:45 PM'''<br />
| B119 Van Vleck<br />
| [https://sites.google.com/wisc.edu/nair-anjali/home/ Anjali Nair] (Math)<br />
| ''[[#Oct 4, Anjali Nair|Reconstruction of Reflection Coefficients Using the Phonon Transport Equation]]''<br />
|<br />
|-<br />
|-<br />
| Oct 18, 4 PM<br />
| 6104 Social Sciences<br />
| [https://jasonltorchinsky.github.io/ Jason Tochinsky] (Math)<br />
| ''[[#Oct 18, Jason Torchinsky|Improving the Vertical Remapping Algorithm in the Department of Energy’s Energy Exascale Earth Systems Model]]''<br />
|<br />
|-<br />
|-<br />
| Oct 25, 4 PM,<br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/patricktbardsley/ Patrick Bardsley] (Senior Machine Learning Engineer at [https://www.cirrus.com/ Cirrus Logic])<br />
| ''[[#Oct 25, Patrick Bardsley|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 8, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/libanmohamed496/ Liban Mohamed] (Machine Learning Engineer at [https://www.mitre.org/ MITRE])<br />
| ''[[#Nov 8, Liban Mohamed|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 15, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/kurt-ehlert-320b8397/ Kurt Ehlert] (Trading Strategy Developer at [https://auros.global/about/ Auros])<br />
| ''[[#Nov 15, Kurt Ehlert|Job Talk-Cryptocurrency Trading]]''<br />
|<br />
|-<br />
|-<br />
| Nov 29, 4 PM<br />
| 9th floor lounge<br />
| [https://people.math.wisc.edu/~boakley/ Bryan Oakley] (Math)<br />
| ''[[#Nov 29, Bryan Oakley|Optimal Spatially Dependent Diffusion]]''<br />
|<br />
|-<br />
|-<br />
| Dec 6, 4 PM<br />
| 9th floor lounge<br />
| [https://sites.google.com/view/hongxuchen/ Hongxu Chen] (Math)<br />
| ''[[#Dec 6, Hongxu Chen|Boltzmann equation with Cercignani-Lampis boundary]]''<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== Sept 20, Julia Lindberg===<br />
Polynomial systems arise naturally in many applications in engineering and the sciences. This talk will outline classes of homotopy continuation algorithms used to solve them. I will then describe ways in which structures such as irreducibility, symmetry and sparsity can be used to improve computational speed. The efficacy of these algorithms will be demonstrated on systems in power systems engineering, statistics and optimization<br />
<br />
<br />
=== Sept 27, Wil Cocke ===<br />
I mostly work as a software developer with an emphasis on data science projects dealing with various Command specific projects. The data science life-cycle is fairly consistent across industries: collect, clean, explore, model, interpret, and repeat with a goal of providing insight to the organization. During my talk, I will share some lessons learned for mathematicians interested in transitioning to software development/ data science. <br />
<br />
<br />
=== Oct 4, Anjali Nair ===<br />
The phonon transport equation is used to model heat conduction in solid materials. I will talk about how we use it to solve an inverse problem to reconstruct the thermal reflection coefficient at an interface. This takes the framework of a PDE constrained optimization problem, and I will also mention the stochastic methods used to solve it.<br />
<br />
<br />
=== Oct 18, Jason Torchinsky ===<br />
A vertical Lagrangian coordinate has been used in global climate models for nearly two decades and has several advantages over other discretizations, including reducing the dimensionality of the physical problem. As the Lagrangian surfaces deform over time, it is necessary to accurately and conservatively remap the vertical Lagrangian coordinate back to a fixed Eulerian coordinate. A popular choice of remapping algorithm is the piecewise parabolic method, a modified version of which is used in the atmospheric component of the Department of Energy's Energy Exascale Earth System Model. However, this version of the remapping algorithm creates unwanted noise at the model top and planetary surface for several standard test cases. We explore four alternative modifications to the algorithm and show that the most accurate of these eliminates this noise. <br />
<br />
<br />
=== Oct 25, Patrick Bardsley ===<br />
During the course of a PhD, students typically enter a proverbial `coal mine’ to extract new information about one or more problems, and in the process become a domain expert in a small niche of the technical and scientific world. Upon leaving the academy, unless one lands a job in their niche domain, much of their problem- and domain-specific knowledge is no longer essential. However, mathematics is broad and general, arguably the most general of all scientific disciplines. This fact alone is a mathematician’s greatest asset and ‘leg-up’ when entering the industrial workforce. In this talk, I will discuss some details of my work, both inside and outside of the academy, with the goal of highlighting the skills and concepts that have been the most general and transferable for me. For example, my academic work on hyperbolic inverse problems helped me learn signal processing concepts I now use daily, while my studies on polycrystalline grain growth pushed me to learn thermodynamics, which translated well to the information theory concepts I now utilize. I will also give you some idea of my current day-to-day responsibilities, and close with my thoughts and suggestions on job searches.<br />
<br />
<br />
=== Nov 8, Liban Mohamed ===<br />
I work as a researcher at MITRE, a company that manages R&D contracts (FFRDCs) with federal agencies. I am nominally a machine learning engineer, but my department supports a diverse array of initiatives with the IRS. In this talk I'll give an overview of the FFRDC space, give a sketch of what I work on and how I spend my time, and share my thoughts about navigating the transition from academia to industry.<br />
<br />
<br />
=== Nov 15, Kurt Ehlert ===<br />
After graduating from the UW, I ventured into the world of trading. My first job was at Virtu, a high-frequency market-maker, and currently I work at Auros, which is a high-frequency trading firm that focuses on cryptocurrencies. During the talk, I will give an overview of the industry, job market, and interview process from the perspective of a "quant". Then I will describe the day-to-day work and give a high-level description of typical projects. <br />
<br />
<br />
=== Nov 29, Bryan Oakley ===<br />
The solution to the diffusion equation is known to converge exponentially to its steady state, and the rate is given by the spectral gap of the elliptic operator. Using variational techniques, we will maximize the spectral gap over choices of spatially dependent diffusion functions. Using this characterization, we can obtain bounds on the optimal rate of convergence.<br />
<br />
=== Dec 6, Hongxu Chen ===<br />
Boltzmann equation is a fundamental kinetic equation that describes the dynamics of dilute gas. In this talk I will focus on the boundary value problem of the Boltzmann equation and introduce the Cercignani-Lampis boundary, which is a physical boundary that describes the intermediate reflection law between diffuse reflection and specular reflection. <br />
<br />
<br />
<br />
<br><br />
<br />
== Past Semesters ==<br />
*[[SIAM Student Chapter Seminar/Fall2021|Fall 2021]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=22647SIAM Student Chapter Seminar2022-02-03T18:29:44Z<p>Nagreen: /* Spring 2022 */</p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' Mondays at 4 PM<br />
*'''Where:''' See list of talks below <br />
*'''Organizers:''' [https://sites.google.com/wisc.edu/evan-sorensen Evan Sorensen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
==Spring 2022==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Feb 7, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 14, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 21, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person | Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
<br />
|}<br />
<br />
== Fall 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Sept 20, 4 PM<br />
| Ingraham 214<br />
| [https://sites.google.com/view/julialindberg/home/ Julia Lindberg] (Electrical and Computer Engineering)<br />
|''[[#Sept 20, Julia Lindberg |Polynomial system solving in applications]]''<br />
|-<br />
|-<br />
| Sept 27, 4 PM, <br />
| Zoom (refreshments and conference call in 307)<br />
| Wil Cocke (Developer for [https://www.arcyber.army.mil/ ARCYBER])<br />
| ''[[#Sept 27, Wil Cocke |Job talk-Software Development/Data Science]]''<br />
|<br />
|-<br />
|-<br />
| Oct 4, '''2:45 PM'''<br />
| B119 Van Vleck<br />
| [https://sites.google.com/wisc.edu/nair-anjali/home/ Anjali Nair] (Math)<br />
| ''[[#Oct 4, Anjali Nair|Reconstruction of Reflection Coefficients Using the Phonon Transport Equation]]''<br />
|<br />
|-<br />
|-<br />
| Oct 18, 4 PM<br />
| 6104 Social Sciences<br />
| [https://jasonltorchinsky.github.io/ Jason Tochinsky] (Math)<br />
| ''[[#Oct 18, Jason Torchinsky|Improving the Vertical Remapping Algorithm in the Department of Energy’s Energy Exascale Earth Systems Model]]''<br />
|<br />
|-<br />
|-<br />
| Oct 25, 4 PM,<br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/patricktbardsley/ Patrick Bardsley] (Senior Machine Learning Engineer at [https://www.cirrus.com/ Cirrus Logic])<br />
| ''[[#Oct 25, Patrick Bardsley|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 8, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/libanmohamed496/ Liban Mohamed] (Machine Learning Engineer at [https://www.mitre.org/ MITRE])<br />
| ''[[#Nov 8, Liban Mohamed|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 15, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/kurt-ehlert-320b8397/ Kurt Ehlert] (Trading Strategy Developer at [https://auros.global/about/ Auros])<br />
| ''[[#Nov 15, Kurt Ehlert|Job Talk-Cryptocurrency Trading]]''<br />
|<br />
|-<br />
|-<br />
| Nov 29, 4 PM<br />
| 9th floor lounge<br />
| [https://people.math.wisc.edu/~boakley/ Bryan Oakley] (Math)<br />
| ''[[#Nov 29, Bryan Oakley|Optimal Spatially Dependent Diffusion]]''<br />
|<br />
|-<br />
|-<br />
| Dec 6, 4 PM<br />
| 9th floor lounge<br />
| [https://sites.google.com/view/hongxuchen/ Hongxu Chen] (Math)<br />
| ''[[#Dec 6, Hongxu Chen|Boltzmann equation with Cercignani-Lampis boundary]]''<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== Sept 20, Julia Lindberg===<br />
Polynomial systems arise naturally in many applications in engineering and the sciences. This talk will outline classes of homotopy continuation algorithms used to solve them. I will then describe ways in which structures such as irreducibility, symmetry and sparsity can be used to improve computational speed. The efficacy of these algorithms will be demonstrated on systems in power systems engineering, statistics and optimization<br />
<br />
<br />
=== Sept 27, Wil Cocke ===<br />
I mostly work as a software developer with an emphasis on data science projects dealing with various Command specific projects. The data science life-cycle is fairly consistent across industries: collect, clean, explore, model, interpret, and repeat with a goal of providing insight to the organization. During my talk, I will share some lessons learned for mathematicians interested in transitioning to software development/ data science. <br />
<br />
<br />
=== Oct 4, Anjali Nair ===<br />
The phonon transport equation is used to model heat conduction in solid materials. I will talk about how we use it to solve an inverse problem to reconstruct the thermal reflection coefficient at an interface. This takes the framework of a PDE constrained optimization problem, and I will also mention the stochastic methods used to solve it.<br />
<br />
<br />
=== Oct 18, Jason Torchinsky ===<br />
A vertical Lagrangian coordinate has been used in global climate models for nearly two decades and has several advantages over other discretizations, including reducing the dimensionality of the physical problem. As the Lagrangian surfaces deform over time, it is necessary to accurately and conservatively remap the vertical Lagrangian coordinate back to a fixed Eulerian coordinate. A popular choice of remapping algorithm is the piecewise parabolic method, a modified version of which is used in the atmospheric component of the Department of Energy's Energy Exascale Earth System Model. However, this version of the remapping algorithm creates unwanted noise at the model top and planetary surface for several standard test cases. We explore four alternative modifications to the algorithm and show that the most accurate of these eliminates this noise. <br />
<br />
<br />
=== Oct 25, Patrick Bardsley ===<br />
During the course of a PhD, students typically enter a proverbial `coal mine’ to extract new information about one or more problems, and in the process become a domain expert in a small niche of the technical and scientific world. Upon leaving the academy, unless one lands a job in their niche domain, much of their problem- and domain-specific knowledge is no longer essential. However, mathematics is broad and general, arguably the most general of all scientific disciplines. This fact alone is a mathematician’s greatest asset and ‘leg-up’ when entering the industrial workforce. In this talk, I will discuss some details of my work, both inside and outside of the academy, with the goal of highlighting the skills and concepts that have been the most general and transferable for me. For example, my academic work on hyperbolic inverse problems helped me learn signal processing concepts I now use daily, while my studies on polycrystalline grain growth pushed me to learn thermodynamics, which translated well to the information theory concepts I now utilize. I will also give you some idea of my current day-to-day responsibilities, and close with my thoughts and suggestions on job searches.<br />
<br />
<br />
=== Nov 8, Liban Mohamed ===<br />
I work as a researcher at MITRE, a company that manages R&D contracts (FFRDCs) with federal agencies. I am nominally a machine learning engineer, but my department supports a diverse array of initiatives with the IRS. In this talk I'll give an overview of the FFRDC space, give a sketch of what I work on and how I spend my time, and share my thoughts about navigating the transition from academia to industry.<br />
<br />
<br />
=== Nov 15, Kurt Ehlert ===<br />
After graduating from the UW, I ventured into the world of trading. My first job was at Virtu, a high-frequency market-maker, and currently I work at Auros, which is a high-frequency trading firm that focuses on cryptocurrencies. During the talk, I will give an overview of the industry, job market, and interview process from the perspective of a "quant". Then I will describe the day-to-day work and give a high-level description of typical projects. <br />
<br />
<br />
=== Nov 29, Bryan Oakley ===<br />
The solution to the diffusion equation is known to converge exponentially to its steady state, and the rate is given by the spectral gap of the elliptic operator. Using variational techniques, we will maximize the spectral gap over choices of spatially dependent diffusion functions. Using this characterization, we can obtain bounds on the optimal rate of convergence.<br />
<br />
=== Dec 6, Hongxu Chen ===<br />
Boltzmann equation is a fundamental kinetic equation that describes the dynamics of dilute gas. In this talk I will focus on the boundary value problem of the Boltzmann equation and introduce the Cercignani-Lampis boundary, which is a physical boundary that describes the intermediate reflection law between diffuse reflection and specular reflection. <br />
<br />
<br />
<br />
<br><br />
<br />
== Past Semesters ==<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=22646SIAM Student Chapter Seminar2022-02-03T18:29:14Z<p>Nagreen: /* Spring 2022 */</p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' Mondays at 4 PM<br />
*'''Where:''' See list of talks below <br />
*'''Organizers:''' [https://sites.google.com/wisc.edu/evan-sorensen Evan Sorensen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
==Spring 2022==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Feb 7, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person ] Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 14, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person ] Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|-<br />
| Feb 21, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person ] Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
<br />
|}<br />
<br />
== Fall 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Sept 20, 4 PM<br />
| Ingraham 214<br />
| [https://sites.google.com/view/julialindberg/home/ Julia Lindberg] (Electrical and Computer Engineering)<br />
|''[[#Sept 20, Julia Lindberg |Polynomial system solving in applications]]''<br />
|-<br />
|-<br />
| Sept 27, 4 PM, <br />
| Zoom (refreshments and conference call in 307)<br />
| Wil Cocke (Developer for [https://www.arcyber.army.mil/ ARCYBER])<br />
| ''[[#Sept 27, Wil Cocke |Job talk-Software Development/Data Science]]''<br />
|<br />
|-<br />
|-<br />
| Oct 4, '''2:45 PM'''<br />
| B119 Van Vleck<br />
| [https://sites.google.com/wisc.edu/nair-anjali/home/ Anjali Nair] (Math)<br />
| ''[[#Oct 4, Anjali Nair|Reconstruction of Reflection Coefficients Using the Phonon Transport Equation]]''<br />
|<br />
|-<br />
|-<br />
| Oct 18, 4 PM<br />
| 6104 Social Sciences<br />
| [https://jasonltorchinsky.github.io/ Jason Tochinsky] (Math)<br />
| ''[[#Oct 18, Jason Torchinsky|Improving the Vertical Remapping Algorithm in the Department of Energy’s Energy Exascale Earth Systems Model]]''<br />
|<br />
|-<br />
|-<br />
| Oct 25, 4 PM,<br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/patricktbardsley/ Patrick Bardsley] (Senior Machine Learning Engineer at [https://www.cirrus.com/ Cirrus Logic])<br />
| ''[[#Oct 25, Patrick Bardsley|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 8, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/libanmohamed496/ Liban Mohamed] (Machine Learning Engineer at [https://www.mitre.org/ MITRE])<br />
| ''[[#Nov 8, Liban Mohamed|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 15, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/kurt-ehlert-320b8397/ Kurt Ehlert] (Trading Strategy Developer at [https://auros.global/about/ Auros])<br />
| ''[[#Nov 15, Kurt Ehlert|Job Talk-Cryptocurrency Trading]]''<br />
|<br />
|-<br />
|-<br />
| Nov 29, 4 PM<br />
| 9th floor lounge<br />
| [https://people.math.wisc.edu/~boakley/ Bryan Oakley] (Math)<br />
| ''[[#Nov 29, Bryan Oakley|Optimal Spatially Dependent Diffusion]]''<br />
|<br />
|-<br />
|-<br />
| Dec 6, 4 PM<br />
| 9th floor lounge<br />
| [https://sites.google.com/view/hongxuchen/ Hongxu Chen] (Math)<br />
| ''[[#Dec 6, Hongxu Chen|Boltzmann equation with Cercignani-Lampis boundary]]''<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== Sept 20, Julia Lindberg===<br />
Polynomial systems arise naturally in many applications in engineering and the sciences. This talk will outline classes of homotopy continuation algorithms used to solve them. I will then describe ways in which structures such as irreducibility, symmetry and sparsity can be used to improve computational speed. The efficacy of these algorithms will be demonstrated on systems in power systems engineering, statistics and optimization<br />
<br />
<br />
=== Sept 27, Wil Cocke ===<br />
I mostly work as a software developer with an emphasis on data science projects dealing with various Command specific projects. The data science life-cycle is fairly consistent across industries: collect, clean, explore, model, interpret, and repeat with a goal of providing insight to the organization. During my talk, I will share some lessons learned for mathematicians interested in transitioning to software development/ data science. <br />
<br />
<br />
=== Oct 4, Anjali Nair ===<br />
The phonon transport equation is used to model heat conduction in solid materials. I will talk about how we use it to solve an inverse problem to reconstruct the thermal reflection coefficient at an interface. This takes the framework of a PDE constrained optimization problem, and I will also mention the stochastic methods used to solve it.<br />
<br />
<br />
=== Oct 18, Jason Torchinsky ===<br />
A vertical Lagrangian coordinate has been used in global climate models for nearly two decades and has several advantages over other discretizations, including reducing the dimensionality of the physical problem. As the Lagrangian surfaces deform over time, it is necessary to accurately and conservatively remap the vertical Lagrangian coordinate back to a fixed Eulerian coordinate. A popular choice of remapping algorithm is the piecewise parabolic method, a modified version of which is used in the atmospheric component of the Department of Energy's Energy Exascale Earth System Model. However, this version of the remapping algorithm creates unwanted noise at the model top and planetary surface for several standard test cases. We explore four alternative modifications to the algorithm and show that the most accurate of these eliminates this noise. <br />
<br />
<br />
=== Oct 25, Patrick Bardsley ===<br />
During the course of a PhD, students typically enter a proverbial `coal mine’ to extract new information about one or more problems, and in the process become a domain expert in a small niche of the technical and scientific world. Upon leaving the academy, unless one lands a job in their niche domain, much of their problem- and domain-specific knowledge is no longer essential. However, mathematics is broad and general, arguably the most general of all scientific disciplines. This fact alone is a mathematician’s greatest asset and ‘leg-up’ when entering the industrial workforce. In this talk, I will discuss some details of my work, both inside and outside of the academy, with the goal of highlighting the skills and concepts that have been the most general and transferable for me. For example, my academic work on hyperbolic inverse problems helped me learn signal processing concepts I now use daily, while my studies on polycrystalline grain growth pushed me to learn thermodynamics, which translated well to the information theory concepts I now utilize. I will also give you some idea of my current day-to-day responsibilities, and close with my thoughts and suggestions on job searches.<br />
<br />
<br />
=== Nov 8, Liban Mohamed ===<br />
I work as a researcher at MITRE, a company that manages R&D contracts (FFRDCs) with federal agencies. I am nominally a machine learning engineer, but my department supports a diverse array of initiatives with the IRS. In this talk I'll give an overview of the FFRDC space, give a sketch of what I work on and how I spend my time, and share my thoughts about navigating the transition from academia to industry.<br />
<br />
<br />
=== Nov 15, Kurt Ehlert ===<br />
After graduating from the UW, I ventured into the world of trading. My first job was at Virtu, a high-frequency market-maker, and currently I work at Auros, which is a high-frequency trading firm that focuses on cryptocurrencies. During the talk, I will give an overview of the industry, job market, and interview process from the perspective of a "quant". Then I will describe the day-to-day work and give a high-level description of typical projects. <br />
<br />
<br />
=== Nov 29, Bryan Oakley ===<br />
The solution to the diffusion equation is known to converge exponentially to its steady state, and the rate is given by the spectral gap of the elliptic operator. Using variational techniques, we will maximize the spectral gap over choices of spatially dependent diffusion functions. Using this characterization, we can obtain bounds on the optimal rate of convergence.<br />
<br />
=== Dec 6, Hongxu Chen ===<br />
Boltzmann equation is a fundamental kinetic equation that describes the dynamics of dilute gas. In this talk I will focus on the boundary value problem of the Boltzmann equation and introduce the Cercignani-Lampis boundary, which is a physical boundary that describes the intermediate reflection law between diffuse reflection and specular reflection. <br />
<br />
<br />
<br />
<br><br />
<br />
== Past Semesters ==<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=22645SIAM Student Chapter Seminar2022-02-03T18:28:38Z<p>Nagreen: </p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' Mondays at 4 PM<br />
*'''Where:''' See list of talks below <br />
*'''Organizers:''' [https://sites.google.com/wisc.edu/evan-sorensen Evan Sorensen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
==Spring 2022==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Feb 7, 4 PM<br />
| LOCATION<br />
| [HOMEPAGE | Person ] Department<br />
|''[[#DATE, PERSON |TITLE]]''<br />
|-<br />
|-<br />
|}<br />
== Fall 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date and time<br />
!align="left" | location<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
| Sept 20, 4 PM<br />
| Ingraham 214<br />
| [https://sites.google.com/view/julialindberg/home/ Julia Lindberg] (Electrical and Computer Engineering)<br />
|''[[#Sept 20, Julia Lindberg |Polynomial system solving in applications]]''<br />
|-<br />
|-<br />
| Sept 27, 4 PM, <br />
| Zoom (refreshments and conference call in 307)<br />
| Wil Cocke (Developer for [https://www.arcyber.army.mil/ ARCYBER])<br />
| ''[[#Sept 27, Wil Cocke |Job talk-Software Development/Data Science]]''<br />
|<br />
|-<br />
|-<br />
| Oct 4, '''2:45 PM'''<br />
| B119 Van Vleck<br />
| [https://sites.google.com/wisc.edu/nair-anjali/home/ Anjali Nair] (Math)<br />
| ''[[#Oct 4, Anjali Nair|Reconstruction of Reflection Coefficients Using the Phonon Transport Equation]]''<br />
|<br />
|-<br />
|-<br />
| Oct 18, 4 PM<br />
| 6104 Social Sciences<br />
| [https://jasonltorchinsky.github.io/ Jason Tochinsky] (Math)<br />
| ''[[#Oct 18, Jason Torchinsky|Improving the Vertical Remapping Algorithm in the Department of Energy’s Energy Exascale Earth Systems Model]]''<br />
|<br />
|-<br />
|-<br />
| Oct 25, 4 PM,<br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/patricktbardsley/ Patrick Bardsley] (Senior Machine Learning Engineer at [https://www.cirrus.com/ Cirrus Logic])<br />
| ''[[#Oct 25, Patrick Bardsley|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 8, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/libanmohamed496/ Liban Mohamed] (Machine Learning Engineer at [https://www.mitre.org/ MITRE])<br />
| ''[[#Nov 8, Liban Mohamed|Job Talk-Machine Learning]]''<br />
|<br />
|-<br />
|-<br />
| Nov 15, 4 PM, <br />
| Zoom (refreshments and conference call in 9th floor lounge)<br />
| [https://www.linkedin.com/in/kurt-ehlert-320b8397/ Kurt Ehlert] (Trading Strategy Developer at [https://auros.global/about/ Auros])<br />
| ''[[#Nov 15, Kurt Ehlert|Job Talk-Cryptocurrency Trading]]''<br />
|<br />
|-<br />
|-<br />
| Nov 29, 4 PM<br />
| 9th floor lounge<br />
| [https://people.math.wisc.edu/~boakley/ Bryan Oakley] (Math)<br />
| ''[[#Nov 29, Bryan Oakley|Optimal Spatially Dependent Diffusion]]''<br />
|<br />
|-<br />
|-<br />
| Dec 6, 4 PM<br />
| 9th floor lounge<br />
| [https://sites.google.com/view/hongxuchen/ Hongxu Chen] (Math)<br />
| ''[[#Dec 6, Hongxu Chen|Boltzmann equation with Cercignani-Lampis boundary]]''<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== Sept 20, Julia Lindberg===<br />
Polynomial systems arise naturally in many applications in engineering and the sciences. This talk will outline classes of homotopy continuation algorithms used to solve them. I will then describe ways in which structures such as irreducibility, symmetry and sparsity can be used to improve computational speed. The efficacy of these algorithms will be demonstrated on systems in power systems engineering, statistics and optimization<br />
<br />
<br />
=== Sept 27, Wil Cocke ===<br />
I mostly work as a software developer with an emphasis on data science projects dealing with various Command specific projects. The data science life-cycle is fairly consistent across industries: collect, clean, explore, model, interpret, and repeat with a goal of providing insight to the organization. During my talk, I will share some lessons learned for mathematicians interested in transitioning to software development/ data science. <br />
<br />
<br />
=== Oct 4, Anjali Nair ===<br />
The phonon transport equation is used to model heat conduction in solid materials. I will talk about how we use it to solve an inverse problem to reconstruct the thermal reflection coefficient at an interface. This takes the framework of a PDE constrained optimization problem, and I will also mention the stochastic methods used to solve it.<br />
<br />
<br />
=== Oct 18, Jason Torchinsky ===<br />
A vertical Lagrangian coordinate has been used in global climate models for nearly two decades and has several advantages over other discretizations, including reducing the dimensionality of the physical problem. As the Lagrangian surfaces deform over time, it is necessary to accurately and conservatively remap the vertical Lagrangian coordinate back to a fixed Eulerian coordinate. A popular choice of remapping algorithm is the piecewise parabolic method, a modified version of which is used in the atmospheric component of the Department of Energy's Energy Exascale Earth System Model. However, this version of the remapping algorithm creates unwanted noise at the model top and planetary surface for several standard test cases. We explore four alternative modifications to the algorithm and show that the most accurate of these eliminates this noise. <br />
<br />
<br />
=== Oct 25, Patrick Bardsley ===<br />
During the course of a PhD, students typically enter a proverbial `coal mine’ to extract new information about one or more problems, and in the process become a domain expert in a small niche of the technical and scientific world. Upon leaving the academy, unless one lands a job in their niche domain, much of their problem- and domain-specific knowledge is no longer essential. However, mathematics is broad and general, arguably the most general of all scientific disciplines. This fact alone is a mathematician’s greatest asset and ‘leg-up’ when entering the industrial workforce. In this talk, I will discuss some details of my work, both inside and outside of the academy, with the goal of highlighting the skills and concepts that have been the most general and transferable for me. For example, my academic work on hyperbolic inverse problems helped me learn signal processing concepts I now use daily, while my studies on polycrystalline grain growth pushed me to learn thermodynamics, which translated well to the information theory concepts I now utilize. I will also give you some idea of my current day-to-day responsibilities, and close with my thoughts and suggestions on job searches.<br />
<br />
<br />
=== Nov 8, Liban Mohamed ===<br />
I work as a researcher at MITRE, a company that manages R&D contracts (FFRDCs) with federal agencies. I am nominally a machine learning engineer, but my department supports a diverse array of initiatives with the IRS. In this talk I'll give an overview of the FFRDC space, give a sketch of what I work on and how I spend my time, and share my thoughts about navigating the transition from academia to industry.<br />
<br />
<br />
=== Nov 15, Kurt Ehlert ===<br />
After graduating from the UW, I ventured into the world of trading. My first job was at Virtu, a high-frequency market-maker, and currently I work at Auros, which is a high-frequency trading firm that focuses on cryptocurrencies. During the talk, I will give an overview of the industry, job market, and interview process from the perspective of a "quant". Then I will describe the day-to-day work and give a high-level description of typical projects. <br />
<br />
<br />
=== Nov 29, Bryan Oakley ===<br />
The solution to the diffusion equation is known to converge exponentially to its steady state, and the rate is given by the spectral gap of the elliptic operator. Using variational techniques, we will maximize the spectral gap over choices of spatially dependent diffusion functions. Using this characterization, we can obtain bounds on the optimal rate of convergence.<br />
<br />
=== Dec 6, Hongxu Chen ===<br />
Boltzmann equation is a fundamental kinetic equation that describes the dynamics of dilute gas. In this talk I will focus on the boundary value problem of the Boltzmann equation and introduce the Cercignani-Lampis boundary, which is a physical boundary that describes the intermediate reflection law between diffuse reflection and specular reflection. <br />
<br />
<br />
<br />
<br><br />
<br />
== Past Semesters ==<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Using_a_Ricoh_Printer_on_a_PC&diff=21654Using a Ricoh Printer on a PC2021-09-17T17:30:17Z<p>Nagreen: </p>
<hr />
<div>===Adding the Ricoh Printer===<br />
<br />
Use these instructions.<br />
<br />
[https://sites.google.com/a/wisc.edu/math-intranet/administrative-resources/computing/printing/windows-ip-printing-instructions PC printing setup instructions]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Using_a_Ricoh_Printer_on_a_Macintosh&diff=21653Using a Ricoh Printer on a Macintosh2021-09-17T16:45:35Z<p>Nagreen: </p>
<hr />
<div>Use these instructions on how to setup a printer on a Macintosh.<br />
<br />
[https://sites.google.com/a/wisc.edu/math-intranet/administrative-resources/computing/printing Setting up printing on your Mac]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Using_a_Ricoh_Printer_on_a_Macintosh&diff=21652Using a Ricoh Printer on a Macintosh2021-09-17T16:45:26Z<p>Nagreen: </p>
<hr />
<div>Use these instructions on how to setup a printer on a Macintosh.<br />
<br />
[https://sites.google.com/a/wisc.edu/math-intranet/administrative-resources/computing/printing | Setting up printing on your Mac]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Using_a_Ricoh_Printer_on_a_Macintosh&diff=21651Using a Ricoh Printer on a Macintosh2021-09-17T16:45:06Z<p>Nagreen: </p>
<hr />
<div>Use these instructions on how to setup a printer on a Macintosh.<br />
<br />
[https://sites.google.com/a/wisc.edu/math-intranet/administrative-resources/computing/printing]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Using_a_Ricoh_Printer_on_a_Macintosh&diff=21650Using a Ricoh Printer on a Macintosh2021-09-17T16:44:48Z<p>Nagreen: </p>
<hr />
<div>Use these instructions on how to setup a printer on a Macintosh.<br />
<br />
https://sites.google.com/a/wisc.edu/math-intranet/administrative-resources/computing/printing</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=21604SIAM Student Chapter Seminar2021-09-15T14:09:09Z<p>Nagreen: </p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' 3:30 pm<br />
*'''Where:''' Zoom <br />
*'''Organizers:''' [https://sites.google.com/wisc.edu/evan-sorensen Evan Sorensen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
== Fall 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
|<br />
|<br />
|<br />
|-<br />
|-<br />
|<br />
|<br />
|<br />
|-<br />
|-<br />
|<br />
|<br />
|<br />
|-<br />
|-<br />
|-<br />
|-<br />
|<br />
|<br />
|<br />
|-<br />
|-<br />
|<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
<br><br />
<br />
== Past Semesters ==<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar/Fall2020&diff=21603SIAM Student Chapter Seminar/Fall20202021-09-15T14:05:24Z<p>Nagreen: Created page with "== Fall 2020 == {| cellpadding="8" !align="left" | date !align="left" | speaker !align="left" | title |- |9/29 |Yu Feng (Math) |''#9/29, Yu Feng (Math)|Phase separation in..."</p>
<hr />
<div>== Fall 2020 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
|9/29<br />
|Yu Feng (Math)<br />
|''[[#9/29, Yu Feng (Math)|Phase separation in the advective Cahn--Hilliard equation]]''<br />
|-<br />
|-<br />
|10/14<br />
|Dongyu Chen (WPI)<br />
|''[[#10/14, Yuchen Dong (WPI)|A Half-order Numerical Scheme for Nonlinear SDEs with one-sided Lipschitz Drift and H\:{o}lder Continuous Diffusion Coefficients]]''<br />
|-<br />
|-<br />
|10/28<br />
|Evan Sorensen (math)<br />
|''[[#10/28, Evan Sorenson (math)|Unsupervised data classification via Bayesian inference]]''<br />
|-<br />
|-<br />
|-<br />
|-<br />
|11/23<br />
|Weijie Pang (McMaster University)<br />
|''[[#11/23, Weijie Pang (McMaster University)|Pandemic Model with Asymptomatic Viral Carriers and Health Policy]]''<br />
|-<br />
|-<br />
|<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== 9/29, Yu Feng (Math) ===<br />
'''Phase separation in the advective Cahn--Hilliard equation'''<br />
<br />
The Cahn--Hilliard equation is a classic model of phase separation in binary mixtures that exhibits spontaneous coarsening of the phases. We study the Cahn--Hilliard equation with an imposed advection term in order to model the stirring and eventual mixing of the phases. The main result is that if the imposed advection is sufficiently mixing then no phase separation occurs, and the solution instead converges exponentially to a homogeneous mixed state. The mixing effectiveness of the imposed drift is quantified in terms of the dissipation time of the associated advection-hyperdiffusion equation, and we produce examples of velocity fields with a small dissipation time. We also study the relationship between this quantity and the dissipation time of the standard advection-diffusion equation.<br />
<br />
<br />
=== 10/14, Yuchen Dong (WPI) ===<br />
'''A Half-order Numerical Scheme for Nonlinear SDEs with one-sided Lipschitz Drift and Hölder Continuous Diffusion Coefficients'''<br />
<br />
We consider positivity-preserving explicit schemes for one-dimensional nonlinear stochastic differential<br />
equations. The drift coefficients satisfy the one-sided Lipschitz condition, and the diffusion coefficients<br />
are Hölder continuous. To control the fast growth of moments of solutions, we introduce several explicit<br />
schemes including the tamed and truncated Euler schemes. The fundamental idea is to guarantee the<br />
non-negativity of solutions. The proofs rely on the boundedness for negative moments and exponential of<br />
negative moments. We present several numerical schemes for a modified Cox-Ingersoll-Ross model and a<br />
two-factor Heston model and demonstrate their half-order convergence rate.<br />
<br />
<br />
=== 10/28, Evan Sorensen (math) ===<br />
''' Unsupervised data classification via Bayesian inference'''<br />
<br />
Bayesian inference is a way of “updating” our current state of knowledge given some data. In this talk, I will discuss how one can use Bayesian inference to classify data into separate groups. Particularly, I will discuss an application of this to outlier detection in contamination control within semiconductor manufacturing. Time permitting, I will talk about some computational tools for these models.<br />
<br />
<br />
<br />
=== 11/23, Weijie Pang (McMaster University) ===<br />
<br />
'''Pandemic Model with Asymptomatic Viral Carriers and Health Policy '''<br />
<br />
By October 13, 2020, the total number of COVID-19 confirmed cases had been 37,880,040 with 1,081,857 death in the world. The speed, range and influence of this virus exceed any pandemic in history. To find reasons of this incredible fast spread, we introduce asymptomatic category into a SEIR pandemic model. Based on published data of Italy, we calibrated exposed rates of COVID-19 in this model and then simulated the spread of COVID-19 for different asymptomatic rates. To measure the effects of different types of public health policies on this pandemic, we construct a pandemic model including health policies. By the simulation of this model, we provide feasible suggestions of containment to regulators. <br />
<br />
<br />
<br />
<br></div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=21602SIAM Student Chapter Seminar2021-09-15T14:05:18Z<p>Nagreen: /* Past Semesters */</p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' 3:30 pm<br />
*'''Where:''' Zoom <br />
*'''Organizers:''' [http://www.math.wisc.edu/~xshen/ Xiao Shen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
== Fall 2020 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
|9/29<br />
|Yu Feng (Math)<br />
|''[[#9/29, Yu Feng (Math)|Phase separation in the advective Cahn--Hilliard equation]]''<br />
|-<br />
|-<br />
|10/14<br />
|Dongyu Chen (WPI)<br />
|''[[#10/14, Yuchen Dong (WPI)|A Half-order Numerical Scheme for Nonlinear SDEs with one-sided Lipschitz Drift and H\:{o}lder Continuous Diffusion Coefficients]]''<br />
|-<br />
|-<br />
|10/28<br />
|Evan Sorensen (math)<br />
|''[[#10/28, Evan Sorenson (math)|Unsupervised data classification via Bayesian inference]]''<br />
|-<br />
|-<br />
|-<br />
|-<br />
|11/23<br />
|Weijie Pang (McMaster University)<br />
|''[[#11/23, Weijie Pang (McMaster University)|Pandemic Model with Asymptomatic Viral Carriers and Health Policy]]''<br />
|-<br />
|-<br />
|<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== 9/29, Yu Feng (Math) ===<br />
'''Phase separation in the advective Cahn--Hilliard equation'''<br />
<br />
The Cahn--Hilliard equation is a classic model of phase separation in binary mixtures that exhibits spontaneous coarsening of the phases. We study the Cahn--Hilliard equation with an imposed advection term in order to model the stirring and eventual mixing of the phases. The main result is that if the imposed advection is sufficiently mixing then no phase separation occurs, and the solution instead converges exponentially to a homogeneous mixed state. The mixing effectiveness of the imposed drift is quantified in terms of the dissipation time of the associated advection-hyperdiffusion equation, and we produce examples of velocity fields with a small dissipation time. We also study the relationship between this quantity and the dissipation time of the standard advection-diffusion equation.<br />
<br />
<br />
=== 10/14, Yuchen Dong (WPI) ===<br />
'''A Half-order Numerical Scheme for Nonlinear SDEs with one-sided Lipschitz Drift and Hölder Continuous Diffusion Coefficients'''<br />
<br />
We consider positivity-preserving explicit schemes for one-dimensional nonlinear stochastic differential<br />
equations. The drift coefficients satisfy the one-sided Lipschitz condition, and the diffusion coefficients<br />
are Hölder continuous. To control the fast growth of moments of solutions, we introduce several explicit<br />
schemes including the tamed and truncated Euler schemes. The fundamental idea is to guarantee the<br />
non-negativity of solutions. The proofs rely on the boundedness for negative moments and exponential of<br />
negative moments. We present several numerical schemes for a modified Cox-Ingersoll-Ross model and a<br />
two-factor Heston model and demonstrate their half-order convergence rate.<br />
<br />
<br />
=== 10/28, Evan Sorensen (math) ===<br />
''' Unsupervised data classification via Bayesian inference'''<br />
<br />
Bayesian inference is a way of “updating” our current state of knowledge given some data. In this talk, I will discuss how one can use Bayesian inference to classify data into separate groups. Particularly, I will discuss an application of this to outlier detection in contamination control within semiconductor manufacturing. Time permitting, I will talk about some computational tools for these models.<br />
<br />
<br />
<br />
=== 11/23, Weijie Pang (McMaster University) ===<br />
<br />
'''Pandemic Model with Asymptomatic Viral Carriers and Health Policy '''<br />
<br />
By October 13, 2020, the total number of COVID-19 confirmed cases had been 37,880,040 with 1,081,857 death in the world. The speed, range and influence of this virus exceed any pandemic in history. To find reasons of this incredible fast spread, we introduce asymptomatic category into a SEIR pandemic model. Based on published data of Italy, we calibrated exposed rates of COVID-19 in this model and then simulated the spread of COVID-19 for different asymptomatic rates. To measure the effects of different types of public health policies on this pandemic, we construct a pandemic model including health policies. By the simulation of this model, we provide feasible suggestions of containment to regulators. <br />
<br />
<br />
<br />
<br><br />
<br />
== Past Semesters ==<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020|Fall 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=SIAM_Student_Chapter_Seminar&diff=21601SIAM Student Chapter Seminar2021-09-15T14:04:59Z<p>Nagreen: </p>
<hr />
<div>__NOTOC__<br />
<br />
*'''When:''' 3:30 pm<br />
*'''Where:''' Zoom <br />
*'''Organizers:''' [http://www.math.wisc.edu/~xshen/ Xiao Shen]<br />
*'''Faculty advisers:''' [http://www.math.wisc.edu/~jeanluc/ Jean-Luc Thiffeault], [http://pages.cs.wisc.edu/~swright/ Steve Wright] <br />
*'''To join the SIAM Chapter mailing list:''' email [mailto:siam-chapter+join@g-groups.wisc.edu siam-chapter+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
== Fall 2020 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
|-<br />
|9/29<br />
|Yu Feng (Math)<br />
|''[[#9/29, Yu Feng (Math)|Phase separation in the advective Cahn--Hilliard equation]]''<br />
|-<br />
|-<br />
|10/14<br />
|Dongyu Chen (WPI)<br />
|''[[#10/14, Yuchen Dong (WPI)|A Half-order Numerical Scheme for Nonlinear SDEs with one-sided Lipschitz Drift and H\:{o}lder Continuous Diffusion Coefficients]]''<br />
|-<br />
|-<br />
|10/28<br />
|Evan Sorensen (math)<br />
|''[[#10/28, Evan Sorenson (math)|Unsupervised data classification via Bayesian inference]]''<br />
|-<br />
|-<br />
|-<br />
|-<br />
|11/23<br />
|Weijie Pang (McMaster University)<br />
|''[[#11/23, Weijie Pang (McMaster University)|Pandemic Model with Asymptomatic Viral Carriers and Health Policy]]''<br />
|-<br />
|-<br />
|<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
=== 9/29, Yu Feng (Math) ===<br />
'''Phase separation in the advective Cahn--Hilliard equation'''<br />
<br />
The Cahn--Hilliard equation is a classic model of phase separation in binary mixtures that exhibits spontaneous coarsening of the phases. We study the Cahn--Hilliard equation with an imposed advection term in order to model the stirring and eventual mixing of the phases. The main result is that if the imposed advection is sufficiently mixing then no phase separation occurs, and the solution instead converges exponentially to a homogeneous mixed state. The mixing effectiveness of the imposed drift is quantified in terms of the dissipation time of the associated advection-hyperdiffusion equation, and we produce examples of velocity fields with a small dissipation time. We also study the relationship between this quantity and the dissipation time of the standard advection-diffusion equation.<br />
<br />
<br />
=== 10/14, Yuchen Dong (WPI) ===<br />
'''A Half-order Numerical Scheme for Nonlinear SDEs with one-sided Lipschitz Drift and Hölder Continuous Diffusion Coefficients'''<br />
<br />
We consider positivity-preserving explicit schemes for one-dimensional nonlinear stochastic differential<br />
equations. The drift coefficients satisfy the one-sided Lipschitz condition, and the diffusion coefficients<br />
are Hölder continuous. To control the fast growth of moments of solutions, we introduce several explicit<br />
schemes including the tamed and truncated Euler schemes. The fundamental idea is to guarantee the<br />
non-negativity of solutions. The proofs rely on the boundedness for negative moments and exponential of<br />
negative moments. We present several numerical schemes for a modified Cox-Ingersoll-Ross model and a<br />
two-factor Heston model and demonstrate their half-order convergence rate.<br />
<br />
<br />
=== 10/28, Evan Sorensen (math) ===<br />
''' Unsupervised data classification via Bayesian inference'''<br />
<br />
Bayesian inference is a way of “updating” our current state of knowledge given some data. In this talk, I will discuss how one can use Bayesian inference to classify data into separate groups. Particularly, I will discuss an application of this to outlier detection in contamination control within semiconductor manufacturing. Time permitting, I will talk about some computational tools for these models.<br />
<br />
<br />
<br />
=== 11/23, Weijie Pang (McMaster University) ===<br />
<br />
'''Pandemic Model with Asymptomatic Viral Carriers and Health Policy '''<br />
<br />
By October 13, 2020, the total number of COVID-19 confirmed cases had been 37,880,040 with 1,081,857 death in the world. The speed, range and influence of this virus exceed any pandemic in history. To find reasons of this incredible fast spread, we introduce asymptomatic category into a SEIR pandemic model. Based on published data of Italy, we calibrated exposed rates of COVID-19 in this model and then simulated the spread of COVID-19 for different asymptomatic rates. To measure the effects of different types of public health policies on this pandemic, we construct a pandemic model including health policies. By the simulation of this model, we provide feasible suggestions of containment to regulators. <br />
<br />
<br />
<br />
<br><br />
<br />
== Past Semesters ==<br />
*[[SIAM_Student_Chapter_Seminar/Fall2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2020|Spring 2020]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2019|Fall 2019]]<br />
*[[SIAM_Student_Chapter_Seminar/Fall2018|Fall 2018]]<br />
*[[SIAM_Student_Chapter_Seminar/Spring2017|Spring 2017]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Algebra_and_Algebraic_Geometry_Seminar_Fall_2021&diff=21490Algebra and Algebraic Geometry Seminar Fall 20212021-09-10T19:59:02Z<p>Nagreen: /* Spring 2021 Schedule */</p>
<hr />
<div>The Virtual Seminar will take place on Fridays at 2:30 pm via Zoom. We will also link to relevant or interesting Zoom talks outside of the seminar.<br />
<br />
==Algebra and Algebraic Geometry Mailing List==<br />
*Please join the AGS mailing list by sending an email to ags+join@g-groups.wisc.edu to hear about upcoming seminars, lunches, and other algebraic geometry events in the department (it is possible you must be on a math department computer to use this link).<br />
<br />
== COVID-19 Update ==<br />
As a result of Covid-19, the seminar for this semester will be a mix of virtual and in-person talks. The default Zoom link for the seminar is https://uwmadison.zoom.us/j/9502605167 (sometimes<br />
we will have to use a different meeting link, if Michael K cannot host that day).<br />
<br />
== Fall 2021 Schedule ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host/link to talk<br />
|-<br />
|September 10<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|September 17<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|September 24|<br />
|<br />
|<br />
|<br />
|-<br />
|October 1<br />
|Michael K Brown (Auburn University)<br />
|Something about toric varieties, probably<br />
|<br />
|Daniel<br />
|-<br />
|October 8<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|October 15<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|October 22<br />
|Ritvik Ramkumar (UC Berkeley)<br />
|Something about Hilbert schemes, probably<br />
|<br />
|Daniel<br />
|-<br />
|October 29<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|November 5<br />
|Eric Ramos<br />
|Equivariant log-concavity<br />
|<br />
|-<br />
|November 12<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|November 19<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|November 26<br />
|Thanksgiving<br />
|<br />
|<br />
|<br />
|-<br />
|December 3<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|December 10<br />
|<br />
|<br />
|<br />
|<br />
|-<br />
|}<br />
<br />
== Abstracts ==<br />
<br />
===Speaker Name===<br />
Title: <br />
<br />
Abstract:</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Fall_2021_and_Spring_2022_Analysis_Seminars&diff=21276Fall 2021 and Spring 2022 Analysis Seminars2021-08-09T17:20:17Z<p>Nagreen: </p>
<hr />
<div><br />
The 2021-2022 Analysis Seminar will be organized by David Beltran and Andreas Seeger.<br />
It will be online for the entire academic year. The regular time for the Seminar will be Tuesdays at 4:00 p.m. (in some cases we will schedule the seminar at different times, to accommodate speakers).<br />
<br />
Zoom links will be sent to those who have signed up for the Analysis Seminar List. If you would like to subscribe to the Analysis seminar list, send a blank email to analysis+join (at) g-groups (dot) wisc (dot) edu as well as an additional email to David and Andreas (dbeltran, seeger at math (dot) wisc (dot) edu) to notify the request.<br />
<br />
If you'd like to suggest speakers for the spring semester please contact David and Andreas.<br />
<br />
= Analysis Seminar Schedule =<br />
{| cellpadding="8"<br />
!align="left" | date <br />
!align="left" | speaker<br />
|align="left" | '''institution'''<br />
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|-<br />
|Date<br />
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|[[#linktoabstract | Title ]]<br />
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|[[#linktoabstract | Title ]]<br />
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|[[#linktoabstract | Title ]]<br />
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|[[#linktoabstract | Title ]]<br />
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|-<br />
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|[[#linktoabstract | Title ]]<br />
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|-<br />
|Date<br />
| Person<br />
| Institution<br />
|[[#linktoabstract | Title ]]<br />
| Sponsor<br />
|-<br />
<br />
|}<br />
<br />
=Abstracts=<br />
===Name===<br />
<br />
Title<br />
<br />
Abstract<br />
<br />
<br />
===Name===<br />
<br />
Title<br />
<br />
Abstract<br />
<br />
<br />
===Name===<br />
<br />
Title<br />
<br />
Abstract<br />
<br />
<br />
===Name===<br />
<br />
Title<br />
<br />
Abstract<br />
<br />
<br />
===Name===<br />
<br />
Title<br />
<br />
Abstract<br />
<br />
<br />
<br />
<br />
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<br />
<br />
<br />
=[[Previous_Analysis_seminars]]=<br />
<br />
https://www.math.wisc.edu/wiki/index.php/Previous_Analysis_seminars<br />
<br />
=Extras=<br />
<br />
[[Blank Analysis Seminar Template]]<br />
<br />
<br />
Graduate Student Seminar:<br />
<br />
https://www.math.wisc.edu/~sguo223/2020Fall_graduate_seminar.html</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Fall_2020_and_Spring_2021_Analysis_Seminars&diff=21275Fall 2020 and Spring 2021 Analysis Seminars2021-08-09T17:19:38Z<p>Nagreen: </p>
<hr />
<div>= Seminar Schedule =<br />
{| cellpadding="8"<br />
!align="left" | date <br />
!align="left" | speaker<br />
|align="left" | '''institution'''<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|September 22<br />
|Alexei Poltoratski<br />
|UW Madison<br />
|[[#Alexei Poltoratski | Dirac inner functions ]]<br />
| <br />
|-<br />
|September 29<br />
|Joris Roos<br />
|University of Massachusetts - Lowell<br />
|[[#Polona Durcik and Joris Rooslinktoabstract | A triangular Hilbert transform with curvature, I ]]<br />
| <br />
|-<br />
|Wednesday September 30, 4 p.m.<br />
|Polona Durcik<br />
|Chapman University<br />
|[[#Polona Durcik and Joris Roos | A triangular Hilbert transform with curvature, II ]]<br />
| <br />
|-<br />
|October 6<br />
|Andrew Zimmer<br />
|UW Madison<br />
|[[#Andrew Zimmer | Complex analytic problems on domains with good intrinsic geometry ]]<br />
| <br />
|-<br />
|October 13<br />
|Hong Wang <br />
|Princeton/IAS<br />
|[[#Hong Wang | Improved decoupling for the parabola ]]<br />
| <br />
|-<br />
|October 20<br />
|Kevin Luli<br />
|UC Davis<br />
|[[#Kevin Luli | Smooth Nonnegative Interpolation ]]<br />
| <br />
|-<br />
|October 21, 4.00 p.m.<br />
|Niclas Technau<br />
|UW Madison<br />
|[[#Niclas Technau | Number theoretic applications of oscillatory integrals ]]<br />
| <br />
|-<br />
|October 27<br />
|Terence Harris<br />
| Cornell University<br />
|[[#Terence Harris | Low dimensional pinned distance sets via spherical averages ]]<br />
| <br />
|-<br />
|Monday, November 2, 4 p.m.<br />
|Yuval Wigderson<br />
|Stanford University<br />
|[[#Yuval Wigderson | New perspectives on the uncertainty principle ]]<br />
| <br />
|-<br />
|November 10, 10 a.m. <br />
|Óscar Domínguez<br />
| Universidad Complutense de Madrid<br />
|[[#Oscar Dominguez | New Brezis--Van Schaftingen--Yung inequalities via maximal operators, Garsia inequalities and Caffarelli--Silvestre extensions ]]<br />
| <br />
|-<br />
|November 17<br />
|Tamas Titkos<br />
|BBS U of Applied Sciences and Renyi Institute<br />
|[[#Tamas Titkos | Isometries of Wasserstein spaces ]]<br />
| <br />
|-<br />
|November 24<br />
|Shukun Wu<br />
|University of Illinois (Urbana-Champaign)<br />
||[[#Shukun Wu | On the Bochner-Riesz operator and the maximal Bochner-Riesz operator ]] <br />
| <br />
|-<br />
|December 1<br />
| Jonathan Hickman<br />
| The University of Edinburgh<br />
|[[#Jonathan Hickman | Sobolev improving for averages over space curves ]]<br />
| <br />
|-<br />
|February 2, 7:00 p.m.<br />
|Hanlong Fang<br />
|UW Madison<br />
|[[#Hanlong Fang | Canonical blow-ups of Grassmann manifolds ]]<br />
| <br />
|-<br />
|February 9<br />
|Bingyang Hu<br />
|Purdue University<br />
|[[#Bingyang Hu | Some structure theorems on general doubling measures ]]<br />
| <br />
|-<br />
|February 16<br />
|Krystal Taylor<br />
|The Ohio State University<br />
|[[#Krystal Taylor | Quantifications of the Besicovitch Projection theorem in a nonlinear setting ]]<br />
|<br />
|-<br />
|February 23<br />
|Dominique Maldague<br />
|MIT<br />
|[[#Dominique Maldague | A new proof of decoupling for the parabola ]]<br />
|<br />
|-<br />
|March 2<br />
|Diogo Oliveira e Silva<br />
|University of Birmingham<br />
|[[#Diogo Oliveira e Silva | Global maximizers for spherical restriction ]]<br />
|<br />
|-<br />
|March 9<br />
|Oleg Safronov <br />
|University of North Carolina Charlotte<br />
|[[#Oleg Safronov | Relations between discrete and continuous spectra of differential operators ]]<br />
|<br />
|-<br />
|March 16<br />
|Ziming Shi<br />
|Rutgers University<br />
|[[#Ziming Shi | Sharp Sobolev 1/2-estimate for dbar equations on strictly pseudoconvex domains with C^2 boundary ]]<br />
|<br />
|-<br />
|March 23<br />
|Xiumin Du<br />
|Northwestern University<br />
|[[#Xiumin Du | Falconer's distance set problem ]]<br />
|<br />
|-<br />
|March 30, 10:00 a.m.<br />
|Etienne Le Masson<br />
|Cergy Paris University<br />
|[[#Etienne Le Masson | Quantum ergodicity for Eisenstein series on large genus hyperbolic surfaces ]]<br />
|<br />
|-<br />
|April 6<br />
|Theresa Anderson <br />
|Purdue University<br />
|[[#Theresa Anderson | Dyadic analysis (virtually) meets number theory ]]<br />
|<br />
|-<br />
|April 13<br />
|Nathan Wagner<br />
|Washington University St. Louis<br />
|[[#Nathan Wagner | Weighted Estimates for the Bergman and Szegő projections on strongly pseudoconvex domains with near minimal smoothness ]]<br />
|<br />
|-<br />
|April 20<br />
|David Beltran<br />
| UW Madison<br />
|[[#David Beltran | Sobolev improving for averages over curves in $\mathbb{R}^4$]]<br />
|<br />
|-<br />
|April 27<br />
|Yumeng Ou<br />
|University of Pennsylvania<br />
|[[#Yumeng Ou | On the multiparameter distance problem]]<br />
|<br />
|-<br />
|}<br />
<br />
=Abstracts=<br />
===Alexei Poltoratski===<br />
<br />
Title: Dirac inner functions<br />
<br />
Abstract: My talk will focus on some new (and old) complex analytic objects arising from Dirac systems of differential equations.<br />
We will discuss connections between problems in complex function theory, spectral and scattering problems for differential<br />
operators and the non-linear Fourier transform.<br />
<br />
===Polona Durcik and Joris Roos===<br />
<br />
Title: A triangular Hilbert transform with curvature, I & II.<br />
<br />
Abstract: The triangular Hilbert is a two-dimensional bilinear singular<br />
originating in time-frequency analysis. No Lp bounds are currently<br />
known for this operator.<br />
In these two talks we discuss a recent joint work with Michael Christ<br />
on a variant of the triangular Hilbert transform involving curvature.<br />
This object is closely related to the bilinear Hilbert transform with<br />
curvature and a maximally modulated singular integral of Stein-Wainger<br />
type. As an application we also discuss a quantitative nonlinear Roth<br />
type theorem on patterns in the Euclidean plane.<br />
The second talk will focus on the proof of a key ingredient, a certain<br />
regularity estimate for a local operator.<br />
<br />
===Andrew Zimmer===<br />
<br />
Title: Complex analytic problems on domains with good intrinsic geometry<br />
<br />
Abstract: In this talk, I will describe a new class of domains in complex Euclidean space which is defined in terms of the existence of a Kaehler metric with good geometric properties. This class is invariant under biholomorphism and includes many well-studied classes of domains such as strongly pseudoconvex domains, finite type domains in dimension two, convex domains, homogeneous domains, and embeddings of Teichmuller spaces. Further, certain analytic problems are tractable for domains in this family even when the boundary is non-smooth. In particular, it is possible to characterize the domains in this family where the dbar-Neumann operator on (0, q)-forms is compact (which generalizes an old result of Fu-Straube for convex domains).<br />
<br />
===Hong Wang===<br />
<br />
Title: Improved decoupling for the parabola<br />
<br />
Abstract: In 2014, Bourgain and Demeter proved the $l^2$ decoupling estimates for the paraboloid with constant $R^{\epsilon}$. <br />
We prove an $(l^2, L^6)$ decoupling inequality for the parabola with constant $(\log R)^c$. This is joint work with Larry Guth and Dominique Maldague.<br />
<br />
===Kevin Luli===<br />
<br />
Title: Smooth Nonnegative Interpolation<br />
<br />
Abstract: Suppose E is an arbitrary subset of R^n. Let f: E \rightarrow [0, \infty). How can we decide if f extends to a nonnegative function C^m function F defined on all of R^n? Suppose E is finite. Can we compute a nonnegative C^m function F on R^n that agrees with f on E with the least possible C^m norm? How many computer operations does this take? In this talk, I will explain recent results on these problems. Non-negativity is one of the most important shape preserving properties for interpolants. In real life applications, the range of the interpolant is imposed by nature. For example, probability density, the amount of snow, rain, humidity, chemical concentration are all nonnegative quantities and are of interest in natural sciences. Even in one dimension, the existing techniques can only handle nonnegative interpolation under special assumptions on the data set. Our results work without any assumptions on the data sets. <br />
<br />
===Niclas Technau===<br />
<br />
Title: Number theoretic applications of oscillatory integrals<br />
<br />
Abstract: We discuss how the analysis of oscillatory integrals can be used to solve number theoretic problems. More specifically, the focus will be on understanding fine-scale statistics of sequences on the unit circle. Further, we shall briefly explain a connection to quantum chaos.<br />
<br />
===Terence Harris===<br />
<br />
Title: Low dimensional pinned distance sets via spherical averages<br />
<br />
Abstract: An inequality is derived for the average t-energy of weighted pinned distance measures, where 0 < t < 1, in terms of the L^2 spherical averages of Fourier transforms of measures. This generalises the result of Liu (originally for Lebesgue measure) to pinned distance sets of dimension smaller than 1, and strengthens Mattila's result from 1987, originally for the full distance set.<br />
<br />
===Yuval Wigderson===<br />
<br />
Title: New perspectives on the uncertainty principle<br />
<br />
Abstract: The phrase ``uncertainty principle'' refers to a wide array of results in several disparate fields of mathematics, all of which capture the notion that a function and its Fourier transform cannot both be ``very localized''. The measure of localization varies from one uncertainty principle to the next, and well-studied notions include the variance (and higher moments), the entropy, the support-size, and the rate of decay at infinity. Similarly, the proofs of the various uncertainty principles rely on a range of tools, from the elementary to the very deep. In this talk, I'll describe how many of the uncertainty principles all follow from a single, simple result, whose proof uses only a basic property of the Fourier transform: that it and its inverse are bounded as operators $L^1 \to L^\infty$. Using this result, one can also prove new variants of the uncertainty principle, which apply to new measures of localization and to operators other than the Fourier transform. This is joint work with Avi Wigderson.<br />
<br />
===Oscar Dominguez===<br />
<br />
Title: New Brezis--Van Schaftingen--Yung inequalities via maximal operators, Garsia inequalities and Caffarelli--Silvestre extensions<br />
<br />
Abstract: The celebrated Bourgain--Brezis--Mironescu formula enables us to recover Sobolev spaces in terms of limits of Gagliardo seminorms. Very recently, Brezis, Van Schaftingen and Yung have proposed an alternative methodology to approach Sobolev spaces via limits of weak-type Gagliardo functionals. The goal of this talk is twofold. Firstly, we will show that the BvSY result is a special case of a more general phenomenon based on maximal inequalities. In particular, we shall derive not only analogs of the BvSY theorem for different kinds of function spaces (Lebesgue, Calderon, higher-order Sobolev, …), but also applications to ergodic theory, Fourier series, etc. In the second part of the talk, we shall investigate the fractional setting in the BvSY theorem. Our approach is based on new Garsia-type inequalities and an application of the Caffarelli--Silvestre extension. This is joint work with Mario Milman.<br />
<br />
===Tamas Titkos===<br />
<br />
Title: Isometries of Wasserstein spaces<br />
<br />
Abstract: Due to its nice theoretical properties and an astonishing number of<br />
applications via optimal transport problems, probably the most<br />
intensively studied metric nowadays is the p-Wasserstein metric. Given<br />
a complete and separable metric space $X$ and a real number $p\geq1$,<br />
one defines the p-Wasserstein space $\mathcal{W}_p(X)$ as the collection<br />
of Borel probability measures with finite $p$-th moment, endowed with a<br />
distance which is calculated by means of transport plans \cite{5}.<br />
<br />
The main aim of our research project is to reveal the structure of the<br />
isometry group $\mathrm{Isom}(\mathcal{W}_p(X))$. Although<br />
$\mathrm{Isom}(X)$ embeds naturally into<br />
$\mathrm{Isom}(\mathcal{W}_p(X))$ by push-forward, and this embedding<br />
turned out to be surjective in many cases (see e.g. [1]), these two<br />
groups are not isomorphic in general. Kloeckner in [2] described<br />
the isometry group of the quadratic Wasserstein space<br />
$\mathcal{W}_2(\mathbb{R}^n)$, and it turned out that the case of $n=1$<br />
is special in the sense that $\mathrm{Isom}(\mathcal{W}_2(\mathbb{R})$<br />
is extremely rich. Namely, it contains a large subgroup of wild behaving<br />
isometries that distort the shape of measures. Following this line of<br />
investigation, in \cite{3} we described<br />
$\mathrm{Isom}(\mathcal{W}_p(\mathbb{R}))$ and<br />
$\mathrm{Isom}(\mathcal{W}_p([0,1])$ for all $p\geq 1$.<br />
<br />
In this talk I will survey first some of the earlier results in the<br />
subject, and then I will present the key results of [3]. If time<br />
permits, I will also report on our most recent manuscript [4] in<br />
which we extended Kloeckner's multidimensional results. Joint work with Gy\"orgy P\'al Geh\'er (University of Reading)<br />
and D\'aniel Virosztek (IST Austria).<br />
<br />
[1] J. Bertrand and B. Kloeckner, \emph{A geometric study of Wasserstein<br />
spaces: isometric rigidity in negative curvature}, International<br />
Mathematics Research Notices, 2016 (5), 1368--1386.<br />
<br />
[2] B. Kloeckner, \emph{A geometric study of Wasserstein spaces: Euclidean<br />
spaces}, Annali della Scuola Normale Superiore di Pisa - Classe di<br />
Scienze, Serie 5, Tome 9 (2010) no. 2, 297--323.<br />
<br />
[3] Gy. P. Geh\'er, T. Titkos, D. Virosztek, \emph{Isometric study of<br />
Wasserstein spaces – the real line}, Trans. Amer. Math. Soc., 373<br />
(2020), 5855--5883.<br />
<br />
[4] Gy. P. Geh\'er, T. Titkos, D. Virosztek, \emph{The isometry group of<br />
Wasserstein spaces: The Hilbertian case}, submitted manuscript.<br />
<br />
[5] C. Villani, \emph{Optimal Transport: Old and New,}<br />
(Grundlehren der mathematischen Wissenschaften)<br />
Springer, 2009.<br />
<br />
===Shukun Wu===<br />
<br />
Title: On the Bochner-Riesz operator and the maximal Bochner-Riesz operator<br />
<br />
Abstract: The Bochner-Riesz problem is one of the most important problems in the field of Fourier analysis. It has a strong connection to other famous problems, such as the restriction conjecture and the Kakeya conjecture. In this talk, I will present some recent improvements to the Bochner-Riesz conjecture and the maximal Bochner-Riesz conjecture. The main methods we used are polynomial partitioning and the Bourgain Demeter l^2 decoupling theorem. <br />
<br />
<br />
===Jonathan Hickman===<br />
<br />
Title: Sobolev improving for averages over space curves<br />
<br />
Abstract: Consider the averaging operator given by convolution with arclength measure on compact piece of a smooth curve in R^n. A simple question is to precisely quantify the gain in regularity induced by this averaging, for instance by studying the L^p-Sobolev mapping properties of the operator. This talk will report on ongoing developments towards understanding this problem. In particular, we will explore some non-trivial necessary conditions on the gain in regularity. Joint with D. Beltran, S. Guo and A. Seeger.<br />
<br />
===Hanlong Fang===<br />
<br />
Title: Canonical blow-ups of Grassmann manifolds<br />
<br />
Abstract: We introduce certain canonical blow-ups \mathcal T_{s,p,n}, as well as their distinct submanifolds \mathcal M_{s,p,n}, of Grassmann manifolds G(p,n) by partitioning the Plücker coordinates with respect to a parameter s. Various geometric aspects of \mathcal T_{s,p,n} and \mathcal M_{s,p,n} are studied, for instance, the smoothness, the holomorphic symmetries, the (semi-)positivity of the anti-canonical bundles, the existence of Kähler-Einstein metrics, the functoriality, etc. In particular, we introduce the notion of homeward compactification, of which \mathcal T_{s,p,n} are examples, as a generalization of the wonderful compactification. <br />
<br />
===Bingyang Hu===<br />
<br />
Title: Some structure theorems on general doubling measures.<br />
<br />
Abstract: In this talk, we will first several structure theorems about general doubling measures. Secondly, we will include some main idea to prove one of these results. More precisely, we will focus on the construction of an explicit family of measures that are p-adic doubling for any finite set of primes, however, not doubling. This part generalizes the work by Boylan, Mills and Ward in 2019 in a highly non-trivial way. As some application, we apply these results (that is, the same construction) to show analogous statements for Muckenhoupt Ap weights and reverse Holder weights. This is a joint work with Tess Anderson.<br />
<br />
===Krystal Taylor===<br />
<br />
Title: Quantifications of the Besicovitch Projection theorem in a nonlinear setting <br />
<br />
Abstract: There are several classical results relating the geometry, dimension, and measure of a set to the structure of its orthogonal projections. <br />
It turns out that many nonlinear projection-type operators also have special geometry that allows us to build similar relationships between a set and its "projections", just as in the linear setting. We will discuss a series of recent results from both geometric and probabilistic vantage points. In particular, we will see that the multi-scale analysis techniques of Tao, as well as the energy techniques of Mattila, can be strengthened and generalized to projection-type operators satisfying a transversality condition. As an application, we address the Buffon curve problem, which is to find upper and lower bounds for the rate of decay of the Favard curve length of the four-corner Cantor set.<br />
<br />
===Dominique Maldague===<br />
<br />
Title: A new proof of decoupling for the parabola<br />
<br />
Abstract: Decoupling has to do with measuring the size of functions with specialized Fourier support (in our case, in a neighborhood of the truncated parabola). Bourgain and Demeter resolved the l^2 decoupling conjecture in 2014, using ingredients like the multilinear Kakeya inequality, L^2 orthogonality, and induction-on-scales. I will present the ideas that go into a new proof of decoupling and make some comparison between the two approaches. This is related to recent joint work with Larry Guth and Hong Wang, as well as forthcoming joint work with Yuqiu Fu and Larry Guth.<br />
<br />
===Diogo Oliveira e Silva===<br />
<br />
Title: Global maximizers for spherical restriction<br />
<br />
Abstract: We prove that constant functions are the unique real-valued maximizers for all $L^2-L^{2n}$ adjoint Fourier restriction inequalities on the unit sphere $\mathbb{S}^{d-1}\subset\mathbb{R}^d$, $d\in\{3,4,5,6,7\}$, where $n\geq 3$ is an integer. The proof uses tools from probability theory, Lie theory, functional analysis, and the theory of special functions. It also relies on general solutions of the underlying Euler--Lagrange equation being smooth, a fact of independent interest which we discuss. We further show that complex-valued maximizers coincide with nonnegative maximizers multiplied by the character $e^{i\xi\cdot\omega}$, for some $\xi$, thereby extending previous work of Christ & Shao (2012) to arbitrary dimensions $d\geq 2$ and general even exponents. This talk is based on results obtained with René Quilodrán.<br />
<br />
===Oleg Safronov===<br />
<br />
Title: Relations between discrete and continuous spectra of differential operators<br />
<br />
Abstract: We will discuss relations between different parts of spectra of differential operators. In particular, we will see that negative and positive spectra of Schroedinger operators are related to each other. However, there is a stipulation: one needs to consider two operators one of which is obtained from the other<br />
by flipping the sign of the potential at each point x. If one knows only that the negative spectra of the two operators are discrete, then their positive spectra do not have gaps. If one knows more about the rate of accumulation of the discrete negative eigenvalues to zero, then one can say more about the absolutely continuous component of the positive spectrum.<br />
<br />
===Ziming Shi===<br />
<br />
Title: Sharp Sobolev $1/2$-estimate for $\bar\partial$ equations on strictly pseudoconvex domains with $C^2$ boundary <br />
<br />
Abstract: We give a solution operator for $\bar\partial$ equation that gains the sharp $1/2$-derivative in the Sobolev space $H^{s,p}$ on any strictly pseudoconvex domain with $C^2$-boundary, for all $1< p < \infty$ and $s>1/p$. <br />
We also show that the same solution operator gains a $1/2$-derivative in the H\"older-Zygmund space $\Lambda^s$ for any $s>0$, where previously it was known for $s>1$ by work of X. Gong. <br />
The main ingredients used in our proof are a Hardy-Littlewood lemma of Sobolev type and a new commutator estimate. <br />
Joint work with Liding Yao.<br />
<br />
===Xiumin Du===<br />
<br />
Title: Falconer's distance set problem<br />
<br />
Abstract: A classical question in geometric measure theory, introduced by Falconer in the 80s is, how large does the Hausdorff dimension of a compact subset in Euclidean space need to be to ensure that the Lebesgue measure of its set of pairwise Euclidean distances is positive. In this talk, I'll report some recent progress on this problem, which combines several ingredients including Orponen's radial projection theorem, Liu's L^2 identity obtained using a group action argument, and the refined decoupling theory. This is based on joint work with Alex Iosevich, Yumeng Ou, Hong Wang, and Ruixiang Zhang.<br />
<br />
===Etienne Le Masson===<br />
<br />
Title: Quantum ergodicity for Eisenstein series on large genus hyperbolic surfaces<br />
<br />
Abstract: We will present a delocalisation result for eigenfunctions of the Laplacian on finite area hyperbolic surfaces of large genus. This is a quantum ergodicity result analogous to a theorem of Zelditch showing that the mass of most L2 eigenfunctions and Eisenstein series (eigenfunctions associated with the continuous spectrum) equidistributes when the eigenvalues tend to infinity. Here we will fix a bounded spectral window and look at a similar equidistribution phenomenon when the area/genus goes to infinity (more precisely the surfaces Benjamini-Schramm converge to the plane). The conditions we require on the surfaces are satisfied with high probability in the Weil-Petersson model of random surfaces introduced by Mirzakhani. They also apply to congruence covers of the modular surface, where we recover a result of Nelson on the equidistribution of Maass forms (with weaker convergence rate). The proof is based on ergodic theory methods.<br />
Joint work with Tuomas Sahlsten.<br />
<br />
===Theresa Anderson===<br />
<br />
Title: Dyadic analysis (virtually) meets number theory<br />
<br />
Abstract: In this talk we discuss two ways in which dyadic analysis and number theory share a rich interaction. The first, which we will spend the most time motivating and discussing, involves a complete classification of "distinct dyadic systems". These are sets of grids which allow one to compare any Euclidean ball nicely with any dyadic cube, and allow for showing that a large number of continuous objects and operators can be "replaced" with their easier dyadic counterparts. If time remains, secondly, we define and make progress on showing the (failure) of a "Hasse principle" in harmonic analysis; specifically, we discuss the interplay between number theory and dyadic analysis that allows us to construct a measure that is "p-adic" doubling for any prime p (in a finite set of primes), yet not doubling overall.<br />
<br />
===Nathan Wagner===<br />
<br />
Title: Weighted Estimates for the Bergman and Szegő projections on strongly pseudoconvex domains with near minimal smoothness <br />
<br />
Abstract: The Bergman and Szegő projections are fundamental operators in complex analysis in one and several complex variables. Consequently, the mapping properties of these operators on L^p and other function spaces have been extensively studied. In this talk, we discuss some recent results for these operators on strongly pseudoconvex domains with near minimal smoothness. In particular, weighted L^p estimates are obtained, where the weight belongs to a suitable generalization of the Békollé-Bonami or Muckenhoupt class. For these domains with less boundary regularity, we use an operator-theoretic technique that goes back to Kerzman and Stein. We also obtain weighted estimates for the endpoint p=1, including weighted weak-type (1,1) estimates. Here we use a modified version of singular-integral theory and a generalization of the Riesz-Kolmogorov characterization of precompact subsets of Lebesgue spaces. This talk is based on joint work with Brett Wick and Cody Stockdale.<br />
<br />
===David Beltran===<br />
<br />
Title: Sobolev improving for averages over curves in $\mathbb{R}^4$ <br />
<br />
Abstract: Given a smooth non-degenerate space curve (that is, a smooth curve whose n-1 curvature functions are non-vanishing), it is a classical question to study the smoothing properties of the averaging operators along a compact piece of such a curve. This question can be quantified, for example, by studying the $L^p$-Sobolev mapping properties of those operators. These are well understood in 2 and 3 dimensions, and in this talk, we present a new sharp result in 4 dimensions. We focus on the positive results; the non-trivial examples which show that our results are best possible were presented by Jonathan Hickman in December 1st. This is joint work with Shaoming Guo, Jonathan Hickman and Andreas Seeger.<br />
<br />
===Yumeng Ou===<br />
<br />
Title: On the multiparameter distance problem<br />
<br />
Abstract: In this talk, we will describe some recent progress on the Falconer distance problem in the multiparameter setting. The original Falconer conjecture (open in all dimensions) says that a compact set $E$ in $\mathbb{R}^d$ must have a distance set $\{|x-y|: x,y\in E\}$ with positive Lebesgue measure provided that the Hausdorff dimension of $E$ is greater than $d/2$. What if the distance set is replaced by a multiparameter distance set? We will discuss some recent work on this problem, which also includes some new results on the multiparameter radial projection theory of fractal measures. This is joint work with Xiumin Du and Ruixiang Zhang.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Fall_2021_and_Spring_2022_Analysis_Seminars&diff=21274Fall 2021 and Spring 2022 Analysis Seminars2021-08-09T17:19:20Z<p>Nagreen: /* Abstracts */</p>
<hr />
<div><br />
The 2020-2021 Analysis Seminar will be organized by David Beltran and Andreas Seeger.<br />
It will be online for the entire academic year. The regular time for the Seminar will be Tuesdays at 4:00 p.m. (in some cases we will schedule the seminar at different times, to accommodate speakers).<br />
<br />
Zoom links will be sent to those who have signed up for the Analysis Seminar List. If you would like to subscribe to the Analysis seminar list, send a blank email to analysis+join (at) g-groups (dot) wisc (dot) edu as well as an additional email to David and Andreas (dbeltran, seeger at math (dot) wisc (dot) edu) to notify the request.<br />
<br />
If you'd like to suggest speakers for the spring semester please contact David and Andreas.<br />
<br />
= Analysis Seminar Schedule =<br />
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=Abstracts=<br />
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=[[Previous_Analysis_seminars]]=<br />
<br />
https://www.math.wisc.edu/wiki/index.php/Previous_Analysis_seminars<br />
<br />
=Extras=<br />
[[Blank Analysis Seminar Template]]<br />
<br />
<br />
Graduate Student Seminar:<br />
<br />
https://www.math.wisc.edu/~sguo223/2020Fall_graduate_seminar.html</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Fall_2020_and_Spring_2021_Analysis_Seminars&diff=21273Fall 2020 and Spring 2021 Analysis Seminars2021-08-09T17:18:26Z<p>Nagreen: /* Fall 2020 and Spring 2021 Analysis Seminar Schedule */</p>
<hr />
<div>= Seminar Schedule =<br />
{| cellpadding="8"<br />
!align="left" | date <br />
!align="left" | speaker<br />
|align="left" | '''institution'''<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|September 22<br />
|Alexei Poltoratski<br />
|UW Madison<br />
|[[#Alexei Poltoratski | Dirac inner functions ]]<br />
| <br />
|-<br />
|September 29<br />
|Joris Roos<br />
|University of Massachusetts - Lowell<br />
|[[#Polona Durcik and Joris Rooslinktoabstract | A triangular Hilbert transform with curvature, I ]]<br />
| <br />
|-<br />
|Wednesday September 30, 4 p.m.<br />
|Polona Durcik<br />
|Chapman University<br />
|[[#Polona Durcik and Joris Roos | A triangular Hilbert transform with curvature, II ]]<br />
| <br />
|-<br />
|October 6<br />
|Andrew Zimmer<br />
|UW Madison<br />
|[[#Andrew Zimmer | Complex analytic problems on domains with good intrinsic geometry ]]<br />
| <br />
|-<br />
|October 13<br />
|Hong Wang <br />
|Princeton/IAS<br />
|[[#Hong Wang | Improved decoupling for the parabola ]]<br />
| <br />
|-<br />
|October 20<br />
|Kevin Luli<br />
|UC Davis<br />
|[[#Kevin Luli | Smooth Nonnegative Interpolation ]]<br />
| <br />
|-<br />
|October 21, 4.00 p.m.<br />
|Niclas Technau<br />
|UW Madison<br />
|[[#Niclas Technau | Number theoretic applications of oscillatory integrals ]]<br />
| <br />
|-<br />
|October 27<br />
|Terence Harris<br />
| Cornell University<br />
|[[#Terence Harris | Low dimensional pinned distance sets via spherical averages ]]<br />
| <br />
|-<br />
|Monday, November 2, 4 p.m.<br />
|Yuval Wigderson<br />
|Stanford University<br />
|[[#Yuval Wigderson | New perspectives on the uncertainty principle ]]<br />
| <br />
|-<br />
|November 10, 10 a.m. <br />
|Óscar Domínguez<br />
| Universidad Complutense de Madrid<br />
|[[#Oscar Dominguez | New Brezis--Van Schaftingen--Yung inequalities via maximal operators, Garsia inequalities and Caffarelli--Silvestre extensions ]]<br />
| <br />
|-<br />
|November 17<br />
|Tamas Titkos<br />
|BBS U of Applied Sciences and Renyi Institute<br />
|[[#Tamas Titkos | Isometries of Wasserstein spaces ]]<br />
| <br />
|-<br />
|November 24<br />
|Shukun Wu<br />
|University of Illinois (Urbana-Champaign)<br />
||[[#Shukun Wu | On the Bochner-Riesz operator and the maximal Bochner-Riesz operator ]] <br />
| <br />
|-<br />
|December 1<br />
| Jonathan Hickman<br />
| The University of Edinburgh<br />
|[[#Jonathan Hickman | Sobolev improving for averages over space curves ]]<br />
| <br />
|-<br />
|February 2, 7:00 p.m.<br />
|Hanlong Fang<br />
|UW Madison<br />
|[[#Hanlong Fang | Canonical blow-ups of Grassmann manifolds ]]<br />
| <br />
|-<br />
|February 9<br />
|Bingyang Hu<br />
|Purdue University<br />
|[[#Bingyang Hu | Some structure theorems on general doubling measures ]]<br />
| <br />
|-<br />
|February 16<br />
|Krystal Taylor<br />
|The Ohio State University<br />
|[[#Krystal Taylor | Quantifications of the Besicovitch Projection theorem in a nonlinear setting ]]<br />
|<br />
|-<br />
|February 23<br />
|Dominique Maldague<br />
|MIT<br />
|[[#Dominique Maldague | A new proof of decoupling for the parabola ]]<br />
|<br />
|-<br />
|March 2<br />
|Diogo Oliveira e Silva<br />
|University of Birmingham<br />
|[[#Diogo Oliveira e Silva | Global maximizers for spherical restriction ]]<br />
|<br />
|-<br />
|March 9<br />
|Oleg Safronov <br />
|University of North Carolina Charlotte<br />
|[[#Oleg Safronov | Relations between discrete and continuous spectra of differential operators ]]<br />
|<br />
|-<br />
|March 16<br />
|Ziming Shi<br />
|Rutgers University<br />
|[[#Ziming Shi | Sharp Sobolev 1/2-estimate for dbar equations on strictly pseudoconvex domains with C^2 boundary ]]<br />
|<br />
|-<br />
|March 23<br />
|Xiumin Du<br />
|Northwestern University<br />
|[[#Xiumin Du | Falconer's distance set problem ]]<br />
|<br />
|-<br />
|March 30, 10:00 a.m.<br />
|Etienne Le Masson<br />
|Cergy Paris University<br />
|[[#Etienne Le Masson | Quantum ergodicity for Eisenstein series on large genus hyperbolic surfaces ]]<br />
|<br />
|-<br />
|April 6<br />
|Theresa Anderson <br />
|Purdue University<br />
|[[#Theresa Anderson | Dyadic analysis (virtually) meets number theory ]]<br />
|<br />
|-<br />
|April 13<br />
|Nathan Wagner<br />
|Washington University St. Louis<br />
|[[#Nathan Wagner | Weighted Estimates for the Bergman and Szegő projections on strongly pseudoconvex domains with near minimal smoothness ]]<br />
|<br />
|-<br />
|April 20<br />
|David Beltran<br />
| UW Madison<br />
|[[#David Beltran | Sobolev improving for averages over curves in $\mathbb{R}^4$]]<br />
|<br />
|-<br />
|April 27<br />
|Yumeng Ou<br />
|University of Pennsylvania<br />
|[[#Yumeng Ou | On the multiparameter distance problem]]<br />
|<br />
|-<br />
|}</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Fall_2020_and_Spring_2021_Analysis_Seminars&diff=21272Fall 2020 and Spring 2021 Analysis Seminars2021-08-09T17:18:16Z<p>Nagreen: Created page with "= Fall 2020 and Spring 2021 Analysis Seminar Schedule = {| cellpadding="8" !align="left" | date !align="left" | speaker |align="left" | '''institution''' !align="left" | ti..."</p>
<hr />
<div>= Fall 2020 and Spring 2021 Analysis Seminar Schedule =<br />
{| cellpadding="8"<br />
!align="left" | date <br />
!align="left" | speaker<br />
|align="left" | '''institution'''<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|September 22<br />
|Alexei Poltoratski<br />
|UW Madison<br />
|[[#Alexei Poltoratski | Dirac inner functions ]]<br />
| <br />
|-<br />
|September 29<br />
|Joris Roos<br />
|University of Massachusetts - Lowell<br />
|[[#Polona Durcik and Joris Rooslinktoabstract | A triangular Hilbert transform with curvature, I ]]<br />
| <br />
|-<br />
|Wednesday September 30, 4 p.m.<br />
|Polona Durcik<br />
|Chapman University<br />
|[[#Polona Durcik and Joris Roos | A triangular Hilbert transform with curvature, II ]]<br />
| <br />
|-<br />
|October 6<br />
|Andrew Zimmer<br />
|UW Madison<br />
|[[#Andrew Zimmer | Complex analytic problems on domains with good intrinsic geometry ]]<br />
| <br />
|-<br />
|October 13<br />
|Hong Wang <br />
|Princeton/IAS<br />
|[[#Hong Wang | Improved decoupling for the parabola ]]<br />
| <br />
|-<br />
|October 20<br />
|Kevin Luli<br />
|UC Davis<br />
|[[#Kevin Luli | Smooth Nonnegative Interpolation ]]<br />
| <br />
|-<br />
|October 21, 4.00 p.m.<br />
|Niclas Technau<br />
|UW Madison<br />
|[[#Niclas Technau | Number theoretic applications of oscillatory integrals ]]<br />
| <br />
|-<br />
|October 27<br />
|Terence Harris<br />
| Cornell University<br />
|[[#Terence Harris | Low dimensional pinned distance sets via spherical averages ]]<br />
| <br />
|-<br />
|Monday, November 2, 4 p.m.<br />
|Yuval Wigderson<br />
|Stanford University<br />
|[[#Yuval Wigderson | New perspectives on the uncertainty principle ]]<br />
| <br />
|-<br />
|November 10, 10 a.m. <br />
|Óscar Domínguez<br />
| Universidad Complutense de Madrid<br />
|[[#Oscar Dominguez | New Brezis--Van Schaftingen--Yung inequalities via maximal operators, Garsia inequalities and Caffarelli--Silvestre extensions ]]<br />
| <br />
|-<br />
|November 17<br />
|Tamas Titkos<br />
|BBS U of Applied Sciences and Renyi Institute<br />
|[[#Tamas Titkos | Isometries of Wasserstein spaces ]]<br />
| <br />
|-<br />
|November 24<br />
|Shukun Wu<br />
|University of Illinois (Urbana-Champaign)<br />
||[[#Shukun Wu | On the Bochner-Riesz operator and the maximal Bochner-Riesz operator ]] <br />
| <br />
|-<br />
|December 1<br />
| Jonathan Hickman<br />
| The University of Edinburgh<br />
|[[#Jonathan Hickman | Sobolev improving for averages over space curves ]]<br />
| <br />
|-<br />
|February 2, 7:00 p.m.<br />
|Hanlong Fang<br />
|UW Madison<br />
|[[#Hanlong Fang | Canonical blow-ups of Grassmann manifolds ]]<br />
| <br />
|-<br />
|February 9<br />
|Bingyang Hu<br />
|Purdue University<br />
|[[#Bingyang Hu | Some structure theorems on general doubling measures ]]<br />
| <br />
|-<br />
|February 16<br />
|Krystal Taylor<br />
|The Ohio State University<br />
|[[#Krystal Taylor | Quantifications of the Besicovitch Projection theorem in a nonlinear setting ]]<br />
|<br />
|-<br />
|February 23<br />
|Dominique Maldague<br />
|MIT<br />
|[[#Dominique Maldague | A new proof of decoupling for the parabola ]]<br />
|<br />
|-<br />
|March 2<br />
|Diogo Oliveira e Silva<br />
|University of Birmingham<br />
|[[#Diogo Oliveira e Silva | Global maximizers for spherical restriction ]]<br />
|<br />
|-<br />
|March 9<br />
|Oleg Safronov <br />
|University of North Carolina Charlotte<br />
|[[#Oleg Safronov | Relations between discrete and continuous spectra of differential operators ]]<br />
|<br />
|-<br />
|March 16<br />
|Ziming Shi<br />
|Rutgers University<br />
|[[#Ziming Shi | Sharp Sobolev 1/2-estimate for dbar equations on strictly pseudoconvex domains with C^2 boundary ]]<br />
|<br />
|-<br />
|March 23<br />
|Xiumin Du<br />
|Northwestern University<br />
|[[#Xiumin Du | Falconer's distance set problem ]]<br />
|<br />
|-<br />
|March 30, 10:00 a.m.<br />
|Etienne Le Masson<br />
|Cergy Paris University<br />
|[[#Etienne Le Masson | Quantum ergodicity for Eisenstein series on large genus hyperbolic surfaces ]]<br />
|<br />
|-<br />
|April 6<br />
|Theresa Anderson <br />
|Purdue University<br />
|[[#Theresa Anderson | Dyadic analysis (virtually) meets number theory ]]<br />
|<br />
|-<br />
|April 13<br />
|Nathan Wagner<br />
|Washington University St. Louis<br />
|[[#Nathan Wagner | Weighted Estimates for the Bergman and Szegő projections on strongly pseudoconvex domains with near minimal smoothness ]]<br />
|<br />
|-<br />
|April 20<br />
|David Beltran<br />
| UW Madison<br />
|[[#David Beltran | Sobolev improving for averages over curves in $\mathbb{R}^4$]]<br />
|<br />
|-<br />
|April 27<br />
|Yumeng Ou<br />
|University of Pennsylvania<br />
|[[#Yumeng Ou | On the multiparameter distance problem]]<br />
|<br />
|-<br />
|}</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Previous_Analysis_seminars&diff=21271Previous Analysis seminars2021-08-09T17:17:59Z<p>Nagreen: </p>
<hr />
<div>[https://www.math.wisc.edu/wiki/index.php/Analysis_Seminar Current schedule]<br />
<br />
Past Analysis seminars:<br />
<br />
*[[Fall 2020 and Spring 2021 Analysis Seminars]]<br />
*[[Fall 2019 and Spring 2020 Analysis Seminars]]<br />
*[[Fall 2018 and Spring 2019 Analysis Seminars]]<br />
*[[Fall 2017 and Spring 2018 Analysis Seminars]]<br />
*[[Spring 2017 Analysis Seminars]]<br />
*[http://www.math.wisc.edu/~seeger/fall16.html Fall 2016]<br />
*[http://www.math.wisc.edu/~seeger/spring16.html Spring 2016]<br />
*[http://www.math.wisc.edu/~seeger/fall15.html Fall 2015]<br />
*[http://www.math.wisc.edu/~seeger/spring15.html Spring 2015]<br />
*[http://www.math.wisc.edu/~seeger/fall14.html Fall 2014]<br />
*[http://www.math.wisc.edu/~seeger/spring14.html Spring 2014]<br />
*[http://www.math.wisc.edu/~seeger/fall13.html Fall 2013]<br />
*[http://www.math.wisc.edu/~seeger/spring13.html Spring 2013]<br />
*[http://www.math.wisc.edu/~seeger/fall12.html Fall 2012]<br />
*[http://www.math.wisc.edu/~seeger/spring12.html Spring 2012]<br />
*[http://www.math.wisc.edu/~seeger/fall11.html Fall 2011]<br />
*[http://www.math.wisc.edu/~seeger/spring11.html Spring 2011]<br />
*[http://www.math.wisc.edu/~seeger/fall10.html Fall 2010]<br />
*[http://www.math.wisc.edu/~seeger/spring10.html Spring 2010]<br />
*[http://www.math.wisc.edu/~seeger/fall09.html Fall 2009]<br />
*[http://www.math.wisc.edu/~seeger/spring09.html Spring 2009]<br />
*[http://www.math.wisc.edu/~seeger/fall08.html Fall 2008]<br />
*[http://www.math.wisc.edu/~seeger/spring08.html Spring 2008]<br />
*[http://www.math.wisc.edu/~seeger/fall07.html Fall 2007]<br />
*[http://www.math.wisc.edu/~seeger/spring07.html Spring 2007]<br />
*[http://www.math.wisc.edu/~seeger/fall06.html Fall 2006]<br />
*[http://www.math.wisc.edu/~seeger/spring06.html Spring 2006]<br />
*[http://www.math.wisc.edu/~seeger/fall05.html Fall 2005]<br />
*[http://www.math.wisc.edu/~seeger/spring05.html Spring 2005]<br />
*[http://www.math.wisc.edu/~seeger/fall04.html Fall 2004]<br />
*[http://www.math.wisc.edu/~seeger/summer04.html Summer 2004]<br />
*[http://www.math.wisc.edu/~seeger/spring04.html Spring 2004]<br />
*[http://www.math.wisc.edu/~seeger/fall03.html Fall 2003]<br />
*[http://www.math.wisc.edu/~seeger/spring03.html Spring 2003]<br />
*[http://www.math.wisc.edu/~seeger/fall02.html Fall 2002]<br />
*[http://www.math.wisc.edu/~seeger/spring02.html Spring 2002]<br />
*[http://www.math.wisc.edu/~seeger/fall01.html Fall 2001]<br />
*[http://www.math.wisc.edu/~seeger/spring01.html Spring 2001]<br />
*[http://www.math.wisc.edu/~seeger/fall00.html Fall 2000]<br />
*[http://www.math.wisc.edu/~seeger/spring00.html Spring 2000]<br />
*[http://www.math.wisc.edu/~seeger/fall99.html Fall 1999]<br />
*[http://www.math.wisc.edu/~seeger/spring99.html Spring 1999]<br />
*[http://www.math.wisc.edu/~seeger/fall98 Fall 1998]<br />
*[http://www.math.wisc.edu/~seeger/spring98.html Spring 1998]<br />
*[http://www.math.wisc.edu/~seeger/fall97.html Fall 1997]<br />
*[http://www.math.wisc.edu/~seeger/spring97.html Spring 1997]<br />
*[http://www.math.wisc.edu/~seeger/fall96.html Fall 1996]<br />
*[http://www.math.wisc.edu/~seeger/spring96.html Spring 1996]<br />
*[http://www.math.wisc.edu/~seeger/fall95.html Fall 1995]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Fall_2021_and_Spring_2022_Analysis_Seminars&diff=21270Fall 2021 and Spring 2022 Analysis Seminars2021-08-09T17:17:24Z<p>Nagreen: /* Current Analysis Seminar Schedule */</p>
<hr />
<div><br />
The 2020-2021 Analysis Seminar will be organized by David Beltran and Andreas Seeger.<br />
It will be online for the entire academic year. The regular time for the Seminar will be Tuesdays at 4:00 p.m. (in some cases we will schedule the seminar at different times, to accommodate speakers).<br />
<br />
Zoom links will be sent to those who have signed up for the Analysis Seminar List. If you would like to subscribe to the Analysis seminar list, send a blank email to analysis+join (at) g-groups (dot) wisc (dot) edu as well as an additional email to David and Andreas (dbeltran, seeger at math (dot) wisc (dot) edu) to notify the request.<br />
<br />
If you'd like to suggest speakers for the spring semester please contact David and Andreas.<br />
<br />
= Analysis Seminar Schedule =<br />
{| cellpadding="8"<br />
!align="left" | date <br />
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<br />
=Abstracts=<br />
===Name===<br />
<br />
Title<br />
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===Name===<br />
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Title<br />
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===Name===<br />
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Title<br />
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Abstract<br />
<br />
<br />
===Name===<br />
<br />
Title<br />
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Abstract<br />
<br />
<br />
===Name===<br />
<br />
Title<br />
<br />
Abstract<br />
<br />
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<br />
=[[Previous_Analysis_seminars]]=<br />
<br />
https://www.math.wisc.edu/wiki/index.php/Previous_Analysis_seminars<br />
<br />
=Abstracts=<br />
===Alexei Poltoratski===<br />
<br />
Title: Dirac inner functions<br />
<br />
Abstract: My talk will focus on some new (and old) complex analytic objects arising from Dirac systems of differential equations.<br />
We will discuss connections between problems in complex function theory, spectral and scattering problems for differential<br />
operators and the non-linear Fourier transform.<br />
<br />
===Polona Durcik and Joris Roos===<br />
<br />
Title: A triangular Hilbert transform with curvature, I & II.<br />
<br />
Abstract: The triangular Hilbert is a two-dimensional bilinear singular<br />
originating in time-frequency analysis. No Lp bounds are currently<br />
known for this operator.<br />
In these two talks we discuss a recent joint work with Michael Christ<br />
on a variant of the triangular Hilbert transform involving curvature.<br />
This object is closely related to the bilinear Hilbert transform with<br />
curvature and a maximally modulated singular integral of Stein-Wainger<br />
type. As an application we also discuss a quantitative nonlinear Roth<br />
type theorem on patterns in the Euclidean plane.<br />
The second talk will focus on the proof of a key ingredient, a certain<br />
regularity estimate for a local operator.<br />
<br />
===Andrew Zimmer===<br />
<br />
Title: Complex analytic problems on domains with good intrinsic geometry<br />
<br />
Abstract: In this talk, I will describe a new class of domains in complex Euclidean space which is defined in terms of the existence of a Kaehler metric with good geometric properties. This class is invariant under biholomorphism and includes many well-studied classes of domains such as strongly pseudoconvex domains, finite type domains in dimension two, convex domains, homogeneous domains, and embeddings of Teichmuller spaces. Further, certain analytic problems are tractable for domains in this family even when the boundary is non-smooth. In particular, it is possible to characterize the domains in this family where the dbar-Neumann operator on (0, q)-forms is compact (which generalizes an old result of Fu-Straube for convex domains).<br />
<br />
===Hong Wang===<br />
<br />
Title: Improved decoupling for the parabola<br />
<br />
Abstract: In 2014, Bourgain and Demeter proved the $l^2$ decoupling estimates for the paraboloid with constant $R^{\epsilon}$. <br />
We prove an $(l^2, L^6)$ decoupling inequality for the parabola with constant $(\log R)^c$. This is joint work with Larry Guth and Dominique Maldague.<br />
<br />
===Kevin Luli===<br />
<br />
Title: Smooth Nonnegative Interpolation<br />
<br />
Abstract: Suppose E is an arbitrary subset of R^n. Let f: E \rightarrow [0, \infty). How can we decide if f extends to a nonnegative function C^m function F defined on all of R^n? Suppose E is finite. Can we compute a nonnegative C^m function F on R^n that agrees with f on E with the least possible C^m norm? How many computer operations does this take? In this talk, I will explain recent results on these problems. Non-negativity is one of the most important shape preserving properties for interpolants. In real life applications, the range of the interpolant is imposed by nature. For example, probability density, the amount of snow, rain, humidity, chemical concentration are all nonnegative quantities and are of interest in natural sciences. Even in one dimension, the existing techniques can only handle nonnegative interpolation under special assumptions on the data set. Our results work without any assumptions on the data sets. <br />
<br />
===Niclas Technau===<br />
<br />
Title: Number theoretic applications of oscillatory integrals<br />
<br />
Abstract: We discuss how the analysis of oscillatory integrals can be used to solve number theoretic problems. More specifically, the focus will be on understanding fine-scale statistics of sequences on the unit circle. Further, we shall briefly explain a connection to quantum chaos.<br />
<br />
===Terence Harris===<br />
<br />
Title: Low dimensional pinned distance sets via spherical averages<br />
<br />
Abstract: An inequality is derived for the average t-energy of weighted pinned distance measures, where 0 < t < 1, in terms of the L^2 spherical averages of Fourier transforms of measures. This generalises the result of Liu (originally for Lebesgue measure) to pinned distance sets of dimension smaller than 1, and strengthens Mattila's result from 1987, originally for the full distance set.<br />
<br />
===Yuval Wigderson===<br />
<br />
Title: New perspectives on the uncertainty principle<br />
<br />
Abstract: The phrase ``uncertainty principle'' refers to a wide array of results in several disparate fields of mathematics, all of which capture the notion that a function and its Fourier transform cannot both be ``very localized''. The measure of localization varies from one uncertainty principle to the next, and well-studied notions include the variance (and higher moments), the entropy, the support-size, and the rate of decay at infinity. Similarly, the proofs of the various uncertainty principles rely on a range of tools, from the elementary to the very deep. In this talk, I'll describe how many of the uncertainty principles all follow from a single, simple result, whose proof uses only a basic property of the Fourier transform: that it and its inverse are bounded as operators $L^1 \to L^\infty$. Using this result, one can also prove new variants of the uncertainty principle, which apply to new measures of localization and to operators other than the Fourier transform. This is joint work with Avi Wigderson.<br />
<br />
===Oscar Dominguez===<br />
<br />
Title: New Brezis--Van Schaftingen--Yung inequalities via maximal operators, Garsia inequalities and Caffarelli--Silvestre extensions<br />
<br />
Abstract: The celebrated Bourgain--Brezis--Mironescu formula enables us to recover Sobolev spaces in terms of limits of Gagliardo seminorms. Very recently, Brezis, Van Schaftingen and Yung have proposed an alternative methodology to approach Sobolev spaces via limits of weak-type Gagliardo functionals. The goal of this talk is twofold. Firstly, we will show that the BvSY result is a special case of a more general phenomenon based on maximal inequalities. In particular, we shall derive not only analogs of the BvSY theorem for different kinds of function spaces (Lebesgue, Calderon, higher-order Sobolev, …), but also applications to ergodic theory, Fourier series, etc. In the second part of the talk, we shall investigate the fractional setting in the BvSY theorem. Our approach is based on new Garsia-type inequalities and an application of the Caffarelli--Silvestre extension. This is joint work with Mario Milman.<br />
<br />
===Tamas Titkos===<br />
<br />
Title: Isometries of Wasserstein spaces<br />
<br />
Abstract: Due to its nice theoretical properties and an astonishing number of<br />
applications via optimal transport problems, probably the most<br />
intensively studied metric nowadays is the p-Wasserstein metric. Given<br />
a complete and separable metric space $X$ and a real number $p\geq1$,<br />
one defines the p-Wasserstein space $\mathcal{W}_p(X)$ as the collection<br />
of Borel probability measures with finite $p$-th moment, endowed with a<br />
distance which is calculated by means of transport plans \cite{5}.<br />
<br />
The main aim of our research project is to reveal the structure of the<br />
isometry group $\mathrm{Isom}(\mathcal{W}_p(X))$. Although<br />
$\mathrm{Isom}(X)$ embeds naturally into<br />
$\mathrm{Isom}(\mathcal{W}_p(X))$ by push-forward, and this embedding<br />
turned out to be surjective in many cases (see e.g. [1]), these two<br />
groups are not isomorphic in general. Kloeckner in [2] described<br />
the isometry group of the quadratic Wasserstein space<br />
$\mathcal{W}_2(\mathbb{R}^n)$, and it turned out that the case of $n=1$<br />
is special in the sense that $\mathrm{Isom}(\mathcal{W}_2(\mathbb{R})$<br />
is extremely rich. Namely, it contains a large subgroup of wild behaving<br />
isometries that distort the shape of measures. Following this line of<br />
investigation, in \cite{3} we described<br />
$\mathrm{Isom}(\mathcal{W}_p(\mathbb{R}))$ and<br />
$\mathrm{Isom}(\mathcal{W}_p([0,1])$ for all $p\geq 1$.<br />
<br />
In this talk I will survey first some of the earlier results in the<br />
subject, and then I will present the key results of [3]. If time<br />
permits, I will also report on our most recent manuscript [4] in<br />
which we extended Kloeckner's multidimensional results. Joint work with Gy\"orgy P\'al Geh\'er (University of Reading)<br />
and D\'aniel Virosztek (IST Austria).<br />
<br />
[1] J. Bertrand and B. Kloeckner, \emph{A geometric study of Wasserstein<br />
spaces: isometric rigidity in negative curvature}, International<br />
Mathematics Research Notices, 2016 (5), 1368--1386.<br />
<br />
[2] B. Kloeckner, \emph{A geometric study of Wasserstein spaces: Euclidean<br />
spaces}, Annali della Scuola Normale Superiore di Pisa - Classe di<br />
Scienze, Serie 5, Tome 9 (2010) no. 2, 297--323.<br />
<br />
[3] Gy. P. Geh\'er, T. Titkos, D. Virosztek, \emph{Isometric study of<br />
Wasserstein spaces – the real line}, Trans. Amer. Math. Soc., 373<br />
(2020), 5855--5883.<br />
<br />
[4] Gy. P. Geh\'er, T. Titkos, D. Virosztek, \emph{The isometry group of<br />
Wasserstein spaces: The Hilbertian case}, submitted manuscript.<br />
<br />
[5] C. Villani, \emph{Optimal Transport: Old and New,}<br />
(Grundlehren der mathematischen Wissenschaften)<br />
Springer, 2009.<br />
<br />
===Shukun Wu===<br />
<br />
Title: On the Bochner-Riesz operator and the maximal Bochner-Riesz operator<br />
<br />
Abstract: The Bochner-Riesz problem is one of the most important problems in the field of Fourier analysis. It has a strong connection to other famous problems, such as the restriction conjecture and the Kakeya conjecture. In this talk, I will present some recent improvements to the Bochner-Riesz conjecture and the maximal Bochner-Riesz conjecture. The main methods we used are polynomial partitioning and the Bourgain Demeter l^2 decoupling theorem. <br />
<br />
<br />
===Jonathan Hickman===<br />
<br />
Title: Sobolev improving for averages over space curves<br />
<br />
Abstract: Consider the averaging operator given by convolution with arclength measure on compact piece of a smooth curve in R^n. A simple question is to precisely quantify the gain in regularity induced by this averaging, for instance by studying the L^p-Sobolev mapping properties of the operator. This talk will report on ongoing developments towards understanding this problem. In particular, we will explore some non-trivial necessary conditions on the gain in regularity. Joint with D. Beltran, S. Guo and A. Seeger.<br />
<br />
===Hanlong Fang===<br />
<br />
Title: Canonical blow-ups of Grassmann manifolds<br />
<br />
Abstract: We introduce certain canonical blow-ups \mathcal T_{s,p,n}, as well as their distinct submanifolds \mathcal M_{s,p,n}, of Grassmann manifolds G(p,n) by partitioning the Plücker coordinates with respect to a parameter s. Various geometric aspects of \mathcal T_{s,p,n} and \mathcal M_{s,p,n} are studied, for instance, the smoothness, the holomorphic symmetries, the (semi-)positivity of the anti-canonical bundles, the existence of Kähler-Einstein metrics, the functoriality, etc. In particular, we introduce the notion of homeward compactification, of which \mathcal T_{s,p,n} are examples, as a generalization of the wonderful compactification. <br />
<br />
===Bingyang Hu===<br />
<br />
Title: Some structure theorems on general doubling measures.<br />
<br />
Abstract: In this talk, we will first several structure theorems about general doubling measures. Secondly, we will include some main idea to prove one of these results. More precisely, we will focus on the construction of an explicit family of measures that are p-adic doubling for any finite set of primes, however, not doubling. This part generalizes the work by Boylan, Mills and Ward in 2019 in a highly non-trivial way. As some application, we apply these results (that is, the same construction) to show analogous statements for Muckenhoupt Ap weights and reverse Holder weights. This is a joint work with Tess Anderson.<br />
<br />
===Krystal Taylor===<br />
<br />
Title: Quantifications of the Besicovitch Projection theorem in a nonlinear setting <br />
<br />
Abstract: There are several classical results relating the geometry, dimension, and measure of a set to the structure of its orthogonal projections. <br />
It turns out that many nonlinear projection-type operators also have special geometry that allows us to build similar relationships between a set and its "projections", just as in the linear setting. We will discuss a series of recent results from both geometric and probabilistic vantage points. In particular, we will see that the multi-scale analysis techniques of Tao, as well as the energy techniques of Mattila, can be strengthened and generalized to projection-type operators satisfying a transversality condition. As an application, we address the Buffon curve problem, which is to find upper and lower bounds for the rate of decay of the Favard curve length of the four-corner Cantor set.<br />
<br />
===Dominique Maldague===<br />
<br />
Title: A new proof of decoupling for the parabola<br />
<br />
Abstract: Decoupling has to do with measuring the size of functions with specialized Fourier support (in our case, in a neighborhood of the truncated parabola). Bourgain and Demeter resolved the l^2 decoupling conjecture in 2014, using ingredients like the multilinear Kakeya inequality, L^2 orthogonality, and induction-on-scales. I will present the ideas that go into a new proof of decoupling and make some comparison between the two approaches. This is related to recent joint work with Larry Guth and Hong Wang, as well as forthcoming joint work with Yuqiu Fu and Larry Guth.<br />
<br />
===Diogo Oliveira e Silva===<br />
<br />
Title: Global maximizers for spherical restriction<br />
<br />
Abstract: We prove that constant functions are the unique real-valued maximizers for all $L^2-L^{2n}$ adjoint Fourier restriction inequalities on the unit sphere $\mathbb{S}^{d-1}\subset\mathbb{R}^d$, $d\in\{3,4,5,6,7\}$, where $n\geq 3$ is an integer. The proof uses tools from probability theory, Lie theory, functional analysis, and the theory of special functions. It also relies on general solutions of the underlying Euler--Lagrange equation being smooth, a fact of independent interest which we discuss. We further show that complex-valued maximizers coincide with nonnegative maximizers multiplied by the character $e^{i\xi\cdot\omega}$, for some $\xi$, thereby extending previous work of Christ & Shao (2012) to arbitrary dimensions $d\geq 2$ and general even exponents. This talk is based on results obtained with René Quilodrán.<br />
<br />
===Oleg Safronov===<br />
<br />
Title: Relations between discrete and continuous spectra of differential operators<br />
<br />
Abstract: We will discuss relations between different parts of spectra of differential operators. In particular, we will see that negative and positive spectra of Schroedinger operators are related to each other. However, there is a stipulation: one needs to consider two operators one of which is obtained from the other<br />
by flipping the sign of the potential at each point x. If one knows only that the negative spectra of the two operators are discrete, then their positive spectra do not have gaps. If one knows more about the rate of accumulation of the discrete negative eigenvalues to zero, then one can say more about the absolutely continuous component of the positive spectrum.<br />
<br />
===Ziming Shi===<br />
<br />
Title: Sharp Sobolev $1/2$-estimate for $\bar\partial$ equations on strictly pseudoconvex domains with $C^2$ boundary <br />
<br />
Abstract: We give a solution operator for $\bar\partial$ equation that gains the sharp $1/2$-derivative in the Sobolev space $H^{s,p}$ on any strictly pseudoconvex domain with $C^2$-boundary, for all $1< p < \infty$ and $s>1/p$. <br />
We also show that the same solution operator gains a $1/2$-derivative in the H\"older-Zygmund space $\Lambda^s$ for any $s>0$, where previously it was known for $s>1$ by work of X. Gong. <br />
The main ingredients used in our proof are a Hardy-Littlewood lemma of Sobolev type and a new commutator estimate. <br />
Joint work with Liding Yao.<br />
<br />
===Xiumin Du===<br />
<br />
Title: Falconer's distance set problem<br />
<br />
Abstract: A classical question in geometric measure theory, introduced by Falconer in the 80s is, how large does the Hausdorff dimension of a compact subset in Euclidean space need to be to ensure that the Lebesgue measure of its set of pairwise Euclidean distances is positive. In this talk, I'll report some recent progress on this problem, which combines several ingredients including Orponen's radial projection theorem, Liu's L^2 identity obtained using a group action argument, and the refined decoupling theory. This is based on joint work with Alex Iosevich, Yumeng Ou, Hong Wang, and Ruixiang Zhang.<br />
<br />
===Etienne Le Masson===<br />
<br />
Title: Quantum ergodicity for Eisenstein series on large genus hyperbolic surfaces<br />
<br />
Abstract: We will present a delocalisation result for eigenfunctions of the Laplacian on finite area hyperbolic surfaces of large genus. This is a quantum ergodicity result analogous to a theorem of Zelditch showing that the mass of most L2 eigenfunctions and Eisenstein series (eigenfunctions associated with the continuous spectrum) equidistributes when the eigenvalues tend to infinity. Here we will fix a bounded spectral window and look at a similar equidistribution phenomenon when the area/genus goes to infinity (more precisely the surfaces Benjamini-Schramm converge to the plane). The conditions we require on the surfaces are satisfied with high probability in the Weil-Petersson model of random surfaces introduced by Mirzakhani. They also apply to congruence covers of the modular surface, where we recover a result of Nelson on the equidistribution of Maass forms (with weaker convergence rate). The proof is based on ergodic theory methods.<br />
Joint work with Tuomas Sahlsten.<br />
<br />
===Theresa Anderson===<br />
<br />
Title: Dyadic analysis (virtually) meets number theory<br />
<br />
Abstract: In this talk we discuss two ways in which dyadic analysis and number theory share a rich interaction. The first, which we will spend the most time motivating and discussing, involves a complete classification of "distinct dyadic systems". These are sets of grids which allow one to compare any Euclidean ball nicely with any dyadic cube, and allow for showing that a large number of continuous objects and operators can be "replaced" with their easier dyadic counterparts. If time remains, secondly, we define and make progress on showing the (failure) of a "Hasse principle" in harmonic analysis; specifically, we discuss the interplay between number theory and dyadic analysis that allows us to construct a measure that is "p-adic" doubling for any prime p (in a finite set of primes), yet not doubling overall.<br />
<br />
===Nathan Wagner===<br />
<br />
Title: Weighted Estimates for the Bergman and Szegő projections on strongly pseudoconvex domains with near minimal smoothness <br />
<br />
Abstract: The Bergman and Szegő projections are fundamental operators in complex analysis in one and several complex variables. Consequently, the mapping properties of these operators on L^p and other function spaces have been extensively studied. In this talk, we discuss some recent results for these operators on strongly pseudoconvex domains with near minimal smoothness. In particular, weighted L^p estimates are obtained, where the weight belongs to a suitable generalization of the Békollé-Bonami or Muckenhoupt class. For these domains with less boundary regularity, we use an operator-theoretic technique that goes back to Kerzman and Stein. We also obtain weighted estimates for the endpoint p=1, including weighted weak-type (1,1) estimates. Here we use a modified version of singular-integral theory and a generalization of the Riesz-Kolmogorov characterization of precompact subsets of Lebesgue spaces. This talk is based on joint work with Brett Wick and Cody Stockdale.<br />
<br />
===David Beltran===<br />
<br />
Title: Sobolev improving for averages over curves in $\mathbb{R}^4$ <br />
<br />
Abstract: Given a smooth non-degenerate space curve (that is, a smooth curve whose n-1 curvature functions are non-vanishing), it is a classical question to study the smoothing properties of the averaging operators along a compact piece of such a curve. This question can be quantified, for example, by studying the $L^p$-Sobolev mapping properties of those operators. These are well understood in 2 and 3 dimensions, and in this talk, we present a new sharp result in 4 dimensions. We focus on the positive results; the non-trivial examples which show that our results are best possible were presented by Jonathan Hickman in December 1st. This is joint work with Shaoming Guo, Jonathan Hickman and Andreas Seeger.<br />
<br />
===Yumeng Ou===<br />
<br />
Title: On the multiparameter distance problem<br />
<br />
Abstract: In this talk, we will describe some recent progress on the Falconer distance problem in the multiparameter setting. The original Falconer conjecture (open in all dimensions) says that a compact set $E$ in $\mathbb{R}^d$ must have a distance set $\{|x-y|: x,y\in E\}$ with positive Lebesgue measure provided that the Hausdorff dimension of $E$ is greater than $d/2$. What if the distance set is replaced by a multiparameter distance set? We will discuss some recent work on this problem, which also includes some new results on the multiparameter radial projection theory of fractal measures. This is joint work with Xiumin Du and Ruixiang Zhang.<br />
<br />
=Extras=<br />
[[Blank Analysis Seminar Template]]<br />
<br />
<br />
Graduate Student Seminar:<br />
<br />
https://www.math.wisc.edu/~sguo223/2020Fall_graduate_seminar.html</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Fall_2021_and_Spring_2022_Analysis_Seminars&diff=21269Fall 2021 and Spring 2022 Analysis Seminars2021-08-09T17:17:07Z<p>Nagreen: </p>
<hr />
<div><br />
The 2020-2021 Analysis Seminar will be organized by David Beltran and Andreas Seeger.<br />
It will be online for the entire academic year. The regular time for the Seminar will be Tuesdays at 4:00 p.m. (in some cases we will schedule the seminar at different times, to accommodate speakers).<br />
<br />
Zoom links will be sent to those who have signed up for the Analysis Seminar List. If you would like to subscribe to the Analysis seminar list, send a blank email to analysis+join (at) g-groups (dot) wisc (dot) edu as well as an additional email to David and Andreas (dbeltran, seeger at math (dot) wisc (dot) edu) to notify the request.<br />
<br />
If you'd like to suggest speakers for the spring semester please contact David and Andreas.<br />
<br />
= Analysis Seminar Schedule =<br />
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=Abstracts=<br />
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=[[Previous_Analysis_seminars]]=<br />
<br />
https://www.math.wisc.edu/wiki/index.php/Previous_Analysis_seminars<br />
<br />
= Current Analysis Seminar Schedule =<br />
{| cellpadding="8"<br />
!align="left" | date <br />
!align="left" | speaker<br />
|align="left" | '''institution'''<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|September 22<br />
|Alexei Poltoratski<br />
|UW Madison<br />
|[[#Alexei Poltoratski | Dirac inner functions ]]<br />
| <br />
|-<br />
|September 29<br />
|Joris Roos<br />
|University of Massachusetts - Lowell<br />
|[[#Polona Durcik and Joris Rooslinktoabstract | A triangular Hilbert transform with curvature, I ]]<br />
| <br />
|-<br />
|Wednesday September 30, 4 p.m.<br />
|Polona Durcik<br />
|Chapman University<br />
|[[#Polona Durcik and Joris Roos | A triangular Hilbert transform with curvature, II ]]<br />
| <br />
|-<br />
|October 6<br />
|Andrew Zimmer<br />
|UW Madison<br />
|[[#Andrew Zimmer | Complex analytic problems on domains with good intrinsic geometry ]]<br />
| <br />
|-<br />
|October 13<br />
|Hong Wang <br />
|Princeton/IAS<br />
|[[#Hong Wang | Improved decoupling for the parabola ]]<br />
| <br />
|-<br />
|October 20<br />
|Kevin Luli<br />
|UC Davis<br />
|[[#Kevin Luli | Smooth Nonnegative Interpolation ]]<br />
| <br />
|-<br />
|October 21, 4.00 p.m.<br />
|Niclas Technau<br />
|UW Madison<br />
|[[#Niclas Technau | Number theoretic applications of oscillatory integrals ]]<br />
| <br />
|-<br />
|October 27<br />
|Terence Harris<br />
| Cornell University<br />
|[[#Terence Harris | Low dimensional pinned distance sets via spherical averages ]]<br />
| <br />
|-<br />
|Monday, November 2, 4 p.m.<br />
|Yuval Wigderson<br />
|Stanford University<br />
|[[#Yuval Wigderson | New perspectives on the uncertainty principle ]]<br />
| <br />
|-<br />
|November 10, 10 a.m. <br />
|Óscar Domínguez<br />
| Universidad Complutense de Madrid<br />
|[[#Oscar Dominguez | New Brezis--Van Schaftingen--Yung inequalities via maximal operators, Garsia inequalities and Caffarelli--Silvestre extensions ]]<br />
| <br />
|-<br />
|November 17<br />
|Tamas Titkos<br />
|BBS U of Applied Sciences and Renyi Institute<br />
|[[#Tamas Titkos | Isometries of Wasserstein spaces ]]<br />
| <br />
|-<br />
|November 24<br />
|Shukun Wu<br />
|University of Illinois (Urbana-Champaign)<br />
||[[#Shukun Wu | On the Bochner-Riesz operator and the maximal Bochner-Riesz operator ]] <br />
| <br />
|-<br />
|December 1<br />
| Jonathan Hickman<br />
| The University of Edinburgh<br />
|[[#Jonathan Hickman | Sobolev improving for averages over space curves ]]<br />
| <br />
|-<br />
|February 2, 7:00 p.m.<br />
|Hanlong Fang<br />
|UW Madison<br />
|[[#Hanlong Fang | Canonical blow-ups of Grassmann manifolds ]]<br />
| <br />
|-<br />
|February 9<br />
|Bingyang Hu<br />
|Purdue University<br />
|[[#Bingyang Hu | Some structure theorems on general doubling measures ]]<br />
| <br />
|-<br />
|February 16<br />
|Krystal Taylor<br />
|The Ohio State University<br />
|[[#Krystal Taylor | Quantifications of the Besicovitch Projection theorem in a nonlinear setting ]]<br />
|<br />
|-<br />
|February 23<br />
|Dominique Maldague<br />
|MIT<br />
|[[#Dominique Maldague | A new proof of decoupling for the parabola ]]<br />
|<br />
|-<br />
|March 2<br />
|Diogo Oliveira e Silva<br />
|University of Birmingham<br />
|[[#Diogo Oliveira e Silva | Global maximizers for spherical restriction ]]<br />
|<br />
|-<br />
|March 9<br />
|Oleg Safronov <br />
|University of North Carolina Charlotte<br />
|[[#Oleg Safronov | Relations between discrete and continuous spectra of differential operators ]]<br />
|<br />
|-<br />
|March 16<br />
|Ziming Shi<br />
|Rutgers University<br />
|[[#Ziming Shi | Sharp Sobolev 1/2-estimate for dbar equations on strictly pseudoconvex domains with C^2 boundary ]]<br />
|<br />
|-<br />
|March 23<br />
|Xiumin Du<br />
|Northwestern University<br />
|[[#Xiumin Du | Falconer's distance set problem ]]<br />
|<br />
|-<br />
|March 30, 10:00 a.m.<br />
|Etienne Le Masson<br />
|Cergy Paris University<br />
|[[#Etienne Le Masson | Quantum ergodicity for Eisenstein series on large genus hyperbolic surfaces ]]<br />
|<br />
|-<br />
|April 6<br />
|Theresa Anderson <br />
|Purdue University<br />
|[[#Theresa Anderson | Dyadic analysis (virtually) meets number theory ]]<br />
|<br />
|-<br />
|April 13<br />
|Nathan Wagner<br />
|Washington University St. Louis<br />
|[[#Nathan Wagner | Weighted Estimates for the Bergman and Szegő projections on strongly pseudoconvex domains with near minimal smoothness ]]<br />
|<br />
|-<br />
|April 20<br />
|David Beltran<br />
| UW Madison<br />
|[[#David Beltran | Sobolev improving for averages over curves in $\mathbb{R}^4$]]<br />
|<br />
|-<br />
|April 27<br />
|Yumeng Ou<br />
|University of Pennsylvania<br />
|[[#Yumeng Ou | On the multiparameter distance problem]]<br />
|<br />
|-<br />
|}<br />
<br />
=Abstracts=<br />
===Alexei Poltoratski===<br />
<br />
Title: Dirac inner functions<br />
<br />
Abstract: My talk will focus on some new (and old) complex analytic objects arising from Dirac systems of differential equations.<br />
We will discuss connections between problems in complex function theory, spectral and scattering problems for differential<br />
operators and the non-linear Fourier transform.<br />
<br />
===Polona Durcik and Joris Roos===<br />
<br />
Title: A triangular Hilbert transform with curvature, I & II.<br />
<br />
Abstract: The triangular Hilbert is a two-dimensional bilinear singular<br />
originating in time-frequency analysis. No Lp bounds are currently<br />
known for this operator.<br />
In these two talks we discuss a recent joint work with Michael Christ<br />
on a variant of the triangular Hilbert transform involving curvature.<br />
This object is closely related to the bilinear Hilbert transform with<br />
curvature and a maximally modulated singular integral of Stein-Wainger<br />
type. As an application we also discuss a quantitative nonlinear Roth<br />
type theorem on patterns in the Euclidean plane.<br />
The second talk will focus on the proof of a key ingredient, a certain<br />
regularity estimate for a local operator.<br />
<br />
===Andrew Zimmer===<br />
<br />
Title: Complex analytic problems on domains with good intrinsic geometry<br />
<br />
Abstract: In this talk, I will describe a new class of domains in complex Euclidean space which is defined in terms of the existence of a Kaehler metric with good geometric properties. This class is invariant under biholomorphism and includes many well-studied classes of domains such as strongly pseudoconvex domains, finite type domains in dimension two, convex domains, homogeneous domains, and embeddings of Teichmuller spaces. Further, certain analytic problems are tractable for domains in this family even when the boundary is non-smooth. In particular, it is possible to characterize the domains in this family where the dbar-Neumann operator on (0, q)-forms is compact (which generalizes an old result of Fu-Straube for convex domains).<br />
<br />
===Hong Wang===<br />
<br />
Title: Improved decoupling for the parabola<br />
<br />
Abstract: In 2014, Bourgain and Demeter proved the $l^2$ decoupling estimates for the paraboloid with constant $R^{\epsilon}$. <br />
We prove an $(l^2, L^6)$ decoupling inequality for the parabola with constant $(\log R)^c$. This is joint work with Larry Guth and Dominique Maldague.<br />
<br />
===Kevin Luli===<br />
<br />
Title: Smooth Nonnegative Interpolation<br />
<br />
Abstract: Suppose E is an arbitrary subset of R^n. Let f: E \rightarrow [0, \infty). How can we decide if f extends to a nonnegative function C^m function F defined on all of R^n? Suppose E is finite. Can we compute a nonnegative C^m function F on R^n that agrees with f on E with the least possible C^m norm? How many computer operations does this take? In this talk, I will explain recent results on these problems. Non-negativity is one of the most important shape preserving properties for interpolants. In real life applications, the range of the interpolant is imposed by nature. For example, probability density, the amount of snow, rain, humidity, chemical concentration are all nonnegative quantities and are of interest in natural sciences. Even in one dimension, the existing techniques can only handle nonnegative interpolation under special assumptions on the data set. Our results work without any assumptions on the data sets. <br />
<br />
===Niclas Technau===<br />
<br />
Title: Number theoretic applications of oscillatory integrals<br />
<br />
Abstract: We discuss how the analysis of oscillatory integrals can be used to solve number theoretic problems. More specifically, the focus will be on understanding fine-scale statistics of sequences on the unit circle. Further, we shall briefly explain a connection to quantum chaos.<br />
<br />
===Terence Harris===<br />
<br />
Title: Low dimensional pinned distance sets via spherical averages<br />
<br />
Abstract: An inequality is derived for the average t-energy of weighted pinned distance measures, where 0 < t < 1, in terms of the L^2 spherical averages of Fourier transforms of measures. This generalises the result of Liu (originally for Lebesgue measure) to pinned distance sets of dimension smaller than 1, and strengthens Mattila's result from 1987, originally for the full distance set.<br />
<br />
===Yuval Wigderson===<br />
<br />
Title: New perspectives on the uncertainty principle<br />
<br />
Abstract: The phrase ``uncertainty principle'' refers to a wide array of results in several disparate fields of mathematics, all of which capture the notion that a function and its Fourier transform cannot both be ``very localized''. The measure of localization varies from one uncertainty principle to the next, and well-studied notions include the variance (and higher moments), the entropy, the support-size, and the rate of decay at infinity. Similarly, the proofs of the various uncertainty principles rely on a range of tools, from the elementary to the very deep. In this talk, I'll describe how many of the uncertainty principles all follow from a single, simple result, whose proof uses only a basic property of the Fourier transform: that it and its inverse are bounded as operators $L^1 \to L^\infty$. Using this result, one can also prove new variants of the uncertainty principle, which apply to new measures of localization and to operators other than the Fourier transform. This is joint work with Avi Wigderson.<br />
<br />
===Oscar Dominguez===<br />
<br />
Title: New Brezis--Van Schaftingen--Yung inequalities via maximal operators, Garsia inequalities and Caffarelli--Silvestre extensions<br />
<br />
Abstract: The celebrated Bourgain--Brezis--Mironescu formula enables us to recover Sobolev spaces in terms of limits of Gagliardo seminorms. Very recently, Brezis, Van Schaftingen and Yung have proposed an alternative methodology to approach Sobolev spaces via limits of weak-type Gagliardo functionals. The goal of this talk is twofold. Firstly, we will show that the BvSY result is a special case of a more general phenomenon based on maximal inequalities. In particular, we shall derive not only analogs of the BvSY theorem for different kinds of function spaces (Lebesgue, Calderon, higher-order Sobolev, …), but also applications to ergodic theory, Fourier series, etc. In the second part of the talk, we shall investigate the fractional setting in the BvSY theorem. Our approach is based on new Garsia-type inequalities and an application of the Caffarelli--Silvestre extension. This is joint work with Mario Milman.<br />
<br />
===Tamas Titkos===<br />
<br />
Title: Isometries of Wasserstein spaces<br />
<br />
Abstract: Due to its nice theoretical properties and an astonishing number of<br />
applications via optimal transport problems, probably the most<br />
intensively studied metric nowadays is the p-Wasserstein metric. Given<br />
a complete and separable metric space $X$ and a real number $p\geq1$,<br />
one defines the p-Wasserstein space $\mathcal{W}_p(X)$ as the collection<br />
of Borel probability measures with finite $p$-th moment, endowed with a<br />
distance which is calculated by means of transport plans \cite{5}.<br />
<br />
The main aim of our research project is to reveal the structure of the<br />
isometry group $\mathrm{Isom}(\mathcal{W}_p(X))$. Although<br />
$\mathrm{Isom}(X)$ embeds naturally into<br />
$\mathrm{Isom}(\mathcal{W}_p(X))$ by push-forward, and this embedding<br />
turned out to be surjective in many cases (see e.g. [1]), these two<br />
groups are not isomorphic in general. Kloeckner in [2] described<br />
the isometry group of the quadratic Wasserstein space<br />
$\mathcal{W}_2(\mathbb{R}^n)$, and it turned out that the case of $n=1$<br />
is special in the sense that $\mathrm{Isom}(\mathcal{W}_2(\mathbb{R})$<br />
is extremely rich. Namely, it contains a large subgroup of wild behaving<br />
isometries that distort the shape of measures. Following this line of<br />
investigation, in \cite{3} we described<br />
$\mathrm{Isom}(\mathcal{W}_p(\mathbb{R}))$ and<br />
$\mathrm{Isom}(\mathcal{W}_p([0,1])$ for all $p\geq 1$.<br />
<br />
In this talk I will survey first some of the earlier results in the<br />
subject, and then I will present the key results of [3]. If time<br />
permits, I will also report on our most recent manuscript [4] in<br />
which we extended Kloeckner's multidimensional results. Joint work with Gy\"orgy P\'al Geh\'er (University of Reading)<br />
and D\'aniel Virosztek (IST Austria).<br />
<br />
[1] J. Bertrand and B. Kloeckner, \emph{A geometric study of Wasserstein<br />
spaces: isometric rigidity in negative curvature}, International<br />
Mathematics Research Notices, 2016 (5), 1368--1386.<br />
<br />
[2] B. Kloeckner, \emph{A geometric study of Wasserstein spaces: Euclidean<br />
spaces}, Annali della Scuola Normale Superiore di Pisa - Classe di<br />
Scienze, Serie 5, Tome 9 (2010) no. 2, 297--323.<br />
<br />
[3] Gy. P. Geh\'er, T. Titkos, D. Virosztek, \emph{Isometric study of<br />
Wasserstein spaces – the real line}, Trans. Amer. Math. Soc., 373<br />
(2020), 5855--5883.<br />
<br />
[4] Gy. P. Geh\'er, T. Titkos, D. Virosztek, \emph{The isometry group of<br />
Wasserstein spaces: The Hilbertian case}, submitted manuscript.<br />
<br />
[5] C. Villani, \emph{Optimal Transport: Old and New,}<br />
(Grundlehren der mathematischen Wissenschaften)<br />
Springer, 2009.<br />
<br />
===Shukun Wu===<br />
<br />
Title: On the Bochner-Riesz operator and the maximal Bochner-Riesz operator<br />
<br />
Abstract: The Bochner-Riesz problem is one of the most important problems in the field of Fourier analysis. It has a strong connection to other famous problems, such as the restriction conjecture and the Kakeya conjecture. In this talk, I will present some recent improvements to the Bochner-Riesz conjecture and the maximal Bochner-Riesz conjecture. The main methods we used are polynomial partitioning and the Bourgain Demeter l^2 decoupling theorem. <br />
<br />
<br />
===Jonathan Hickman===<br />
<br />
Title: Sobolev improving for averages over space curves<br />
<br />
Abstract: Consider the averaging operator given by convolution with arclength measure on compact piece of a smooth curve in R^n. A simple question is to precisely quantify the gain in regularity induced by this averaging, for instance by studying the L^p-Sobolev mapping properties of the operator. This talk will report on ongoing developments towards understanding this problem. In particular, we will explore some non-trivial necessary conditions on the gain in regularity. Joint with D. Beltran, S. Guo and A. Seeger.<br />
<br />
===Hanlong Fang===<br />
<br />
Title: Canonical blow-ups of Grassmann manifolds<br />
<br />
Abstract: We introduce certain canonical blow-ups \mathcal T_{s,p,n}, as well as their distinct submanifolds \mathcal M_{s,p,n}, of Grassmann manifolds G(p,n) by partitioning the Plücker coordinates with respect to a parameter s. Various geometric aspects of \mathcal T_{s,p,n} and \mathcal M_{s,p,n} are studied, for instance, the smoothness, the holomorphic symmetries, the (semi-)positivity of the anti-canonical bundles, the existence of Kähler-Einstein metrics, the functoriality, etc. In particular, we introduce the notion of homeward compactification, of which \mathcal T_{s,p,n} are examples, as a generalization of the wonderful compactification. <br />
<br />
===Bingyang Hu===<br />
<br />
Title: Some structure theorems on general doubling measures.<br />
<br />
Abstract: In this talk, we will first several structure theorems about general doubling measures. Secondly, we will include some main idea to prove one of these results. More precisely, we will focus on the construction of an explicit family of measures that are p-adic doubling for any finite set of primes, however, not doubling. This part generalizes the work by Boylan, Mills and Ward in 2019 in a highly non-trivial way. As some application, we apply these results (that is, the same construction) to show analogous statements for Muckenhoupt Ap weights and reverse Holder weights. This is a joint work with Tess Anderson.<br />
<br />
===Krystal Taylor===<br />
<br />
Title: Quantifications of the Besicovitch Projection theorem in a nonlinear setting <br />
<br />
Abstract: There are several classical results relating the geometry, dimension, and measure of a set to the structure of its orthogonal projections. <br />
It turns out that many nonlinear projection-type operators also have special geometry that allows us to build similar relationships between a set and its "projections", just as in the linear setting. We will discuss a series of recent results from both geometric and probabilistic vantage points. In particular, we will see that the multi-scale analysis techniques of Tao, as well as the energy techniques of Mattila, can be strengthened and generalized to projection-type operators satisfying a transversality condition. As an application, we address the Buffon curve problem, which is to find upper and lower bounds for the rate of decay of the Favard curve length of the four-corner Cantor set.<br />
<br />
===Dominique Maldague===<br />
<br />
Title: A new proof of decoupling for the parabola<br />
<br />
Abstract: Decoupling has to do with measuring the size of functions with specialized Fourier support (in our case, in a neighborhood of the truncated parabola). Bourgain and Demeter resolved the l^2 decoupling conjecture in 2014, using ingredients like the multilinear Kakeya inequality, L^2 orthogonality, and induction-on-scales. I will present the ideas that go into a new proof of decoupling and make some comparison between the two approaches. This is related to recent joint work with Larry Guth and Hong Wang, as well as forthcoming joint work with Yuqiu Fu and Larry Guth.<br />
<br />
===Diogo Oliveira e Silva===<br />
<br />
Title: Global maximizers for spherical restriction<br />
<br />
Abstract: We prove that constant functions are the unique real-valued maximizers for all $L^2-L^{2n}$ adjoint Fourier restriction inequalities on the unit sphere $\mathbb{S}^{d-1}\subset\mathbb{R}^d$, $d\in\{3,4,5,6,7\}$, where $n\geq 3$ is an integer. The proof uses tools from probability theory, Lie theory, functional analysis, and the theory of special functions. It also relies on general solutions of the underlying Euler--Lagrange equation being smooth, a fact of independent interest which we discuss. We further show that complex-valued maximizers coincide with nonnegative maximizers multiplied by the character $e^{i\xi\cdot\omega}$, for some $\xi$, thereby extending previous work of Christ & Shao (2012) to arbitrary dimensions $d\geq 2$ and general even exponents. This talk is based on results obtained with René Quilodrán.<br />
<br />
===Oleg Safronov===<br />
<br />
Title: Relations between discrete and continuous spectra of differential operators<br />
<br />
Abstract: We will discuss relations between different parts of spectra of differential operators. In particular, we will see that negative and positive spectra of Schroedinger operators are related to each other. However, there is a stipulation: one needs to consider two operators one of which is obtained from the other<br />
by flipping the sign of the potential at each point x. If one knows only that the negative spectra of the two operators are discrete, then their positive spectra do not have gaps. If one knows more about the rate of accumulation of the discrete negative eigenvalues to zero, then one can say more about the absolutely continuous component of the positive spectrum.<br />
<br />
===Ziming Shi===<br />
<br />
Title: Sharp Sobolev $1/2$-estimate for $\bar\partial$ equations on strictly pseudoconvex domains with $C^2$ boundary <br />
<br />
Abstract: We give a solution operator for $\bar\partial$ equation that gains the sharp $1/2$-derivative in the Sobolev space $H^{s,p}$ on any strictly pseudoconvex domain with $C^2$-boundary, for all $1< p < \infty$ and $s>1/p$. <br />
We also show that the same solution operator gains a $1/2$-derivative in the H\"older-Zygmund space $\Lambda^s$ for any $s>0$, where previously it was known for $s>1$ by work of X. Gong. <br />
The main ingredients used in our proof are a Hardy-Littlewood lemma of Sobolev type and a new commutator estimate. <br />
Joint work with Liding Yao.<br />
<br />
===Xiumin Du===<br />
<br />
Title: Falconer's distance set problem<br />
<br />
Abstract: A classical question in geometric measure theory, introduced by Falconer in the 80s is, how large does the Hausdorff dimension of a compact subset in Euclidean space need to be to ensure that the Lebesgue measure of its set of pairwise Euclidean distances is positive. In this talk, I'll report some recent progress on this problem, which combines several ingredients including Orponen's radial projection theorem, Liu's L^2 identity obtained using a group action argument, and the refined decoupling theory. This is based on joint work with Alex Iosevich, Yumeng Ou, Hong Wang, and Ruixiang Zhang.<br />
<br />
===Etienne Le Masson===<br />
<br />
Title: Quantum ergodicity for Eisenstein series on large genus hyperbolic surfaces<br />
<br />
Abstract: We will present a delocalisation result for eigenfunctions of the Laplacian on finite area hyperbolic surfaces of large genus. This is a quantum ergodicity result analogous to a theorem of Zelditch showing that the mass of most L2 eigenfunctions and Eisenstein series (eigenfunctions associated with the continuous spectrum) equidistributes when the eigenvalues tend to infinity. Here we will fix a bounded spectral window and look at a similar equidistribution phenomenon when the area/genus goes to infinity (more precisely the surfaces Benjamini-Schramm converge to the plane). The conditions we require on the surfaces are satisfied with high probability in the Weil-Petersson model of random surfaces introduced by Mirzakhani. They also apply to congruence covers of the modular surface, where we recover a result of Nelson on the equidistribution of Maass forms (with weaker convergence rate). The proof is based on ergodic theory methods.<br />
Joint work with Tuomas Sahlsten.<br />
<br />
===Theresa Anderson===<br />
<br />
Title: Dyadic analysis (virtually) meets number theory<br />
<br />
Abstract: In this talk we discuss two ways in which dyadic analysis and number theory share a rich interaction. The first, which we will spend the most time motivating and discussing, involves a complete classification of "distinct dyadic systems". These are sets of grids which allow one to compare any Euclidean ball nicely with any dyadic cube, and allow for showing that a large number of continuous objects and operators can be "replaced" with their easier dyadic counterparts. If time remains, secondly, we define and make progress on showing the (failure) of a "Hasse principle" in harmonic analysis; specifically, we discuss the interplay between number theory and dyadic analysis that allows us to construct a measure that is "p-adic" doubling for any prime p (in a finite set of primes), yet not doubling overall.<br />
<br />
===Nathan Wagner===<br />
<br />
Title: Weighted Estimates for the Bergman and Szegő projections on strongly pseudoconvex domains with near minimal smoothness <br />
<br />
Abstract: The Bergman and Szegő projections are fundamental operators in complex analysis in one and several complex variables. Consequently, the mapping properties of these operators on L^p and other function spaces have been extensively studied. In this talk, we discuss some recent results for these operators on strongly pseudoconvex domains with near minimal smoothness. In particular, weighted L^p estimates are obtained, where the weight belongs to a suitable generalization of the Békollé-Bonami or Muckenhoupt class. For these domains with less boundary regularity, we use an operator-theoretic technique that goes back to Kerzman and Stein. We also obtain weighted estimates for the endpoint p=1, including weighted weak-type (1,1) estimates. Here we use a modified version of singular-integral theory and a generalization of the Riesz-Kolmogorov characterization of precompact subsets of Lebesgue spaces. This talk is based on joint work with Brett Wick and Cody Stockdale.<br />
<br />
===David Beltran===<br />
<br />
Title: Sobolev improving for averages over curves in $\mathbb{R}^4$ <br />
<br />
Abstract: Given a smooth non-degenerate space curve (that is, a smooth curve whose n-1 curvature functions are non-vanishing), it is a classical question to study the smoothing properties of the averaging operators along a compact piece of such a curve. This question can be quantified, for example, by studying the $L^p$-Sobolev mapping properties of those operators. These are well understood in 2 and 3 dimensions, and in this talk, we present a new sharp result in 4 dimensions. We focus on the positive results; the non-trivial examples which show that our results are best possible were presented by Jonathan Hickman in December 1st. This is joint work with Shaoming Guo, Jonathan Hickman and Andreas Seeger.<br />
<br />
===Yumeng Ou===<br />
<br />
Title: On the multiparameter distance problem<br />
<br />
Abstract: In this talk, we will describe some recent progress on the Falconer distance problem in the multiparameter setting. The original Falconer conjecture (open in all dimensions) says that a compact set $E$ in $\mathbb{R}^d$ must have a distance set $\{|x-y|: x,y\in E\}$ with positive Lebesgue measure provided that the Hausdorff dimension of $E$ is greater than $d/2$. What if the distance set is replaced by a multiparameter distance set? We will discuss some recent work on this problem, which also includes some new results on the multiparameter radial projection theory of fractal measures. This is joint work with Xiumin Du and Ruixiang Zhang.<br />
<br />
=Extras=<br />
[[Blank Analysis Seminar Template]]<br />
<br />
<br />
Graduate Student Seminar:<br />
<br />
https://www.math.wisc.edu/~sguo223/2020Fall_graduate_seminar.html</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Analysis&diff=21268Analysis2021-08-09T17:16:15Z<p>Nagreen: /* Seminars, Conferences, Other Activities */</p>
<hr />
<div>The members of the Analysis group work on a wide spectrum of topics. Our research interests include:<br />
<br />
Complex Analysis<br />
Harmonic Analysis<br />
Partial Differential Equations<br />
Mathematical Physics<br />
Approximation Theory<br />
Analysis on Lie groups<br />
Analytic Number Theory <br />
Special Functions <br />
Wavelets<br />
<br />
<br />
==[https://hilbert.math.wisc.edu/wiki/index.php/Analysis_Seminar Seminars], [http://www.math.wisc.edu/~seeger/pastconf.html Conferences], Other Activities==<br />
[https://hilbert.math.wisc.edu/wiki/index.php/Analysis_Seminar Analysis Seminar] usually meets on Tuesdays at 4:00 p.m. in B139 Van Vleck Hall. Here is a list of [http://www.math.wisc.edu/~seeger/pastsem.html past seminars].<br />
<br />
[http://www.math.wisc.edu/~seeger/pastconf.html Conferences and other events]<br />
<br />
[http://www.math.wisc.edu/apam/ RTG in Analysis and Applications]<br />
<br />
=='''Faculty'''==<br />
<br />
[[Image:Denissov.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~denissov Serguei Denissov]<br><br />
Moscow State University, 1999 <br><br />
Professor<br><br />
denissov at math.wisc.edu<br />
<br />
[[Image:Gong.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~gong Xianghong Gong]<br><br />
University of Chicago, 1994<br><br />
Professor<br><br />
gong at math.wisc.edu<br />
<br />
[[Image:Marshall.jpg|left|x110px|top]] <br />
[http://www.math.wisc.edu/~marshall Simon Marshall]<br><br />
Princeton University, 2010<br><br />
Assistant Professor<br><br />
marshall at math.wisc.edu<br />
<br />
[[Image:Amos_Ron.jpg|left|x110px|top]]<br />
[http://www.cs.wisc.edu/~amos Amos Ron]<br><br />
Tel Aviv University, 1987<br><br />
Professor<br><br />
amos at cs.wisc.edu<br />
<br />
[[Image:Seeger.jpg|left|x110px|top]] <br />
[http://www.math.wisc.edu/~seeger Andreas Seeger]<br><br />
Technical University, Darmstadt, 1985<br><br />
Professor<br><br />
seeger at math.wisc.edu<br />
<br />
[[Image:Stovall.jpg|left|x110px|top]] <br />
[http://www.math.wisc.edu/~stovall Betsy Stovall]<br><br />
UC Berkeley, 2009<br><br />
Assistant Professor<br><br />
stovall at math.wisc.edu<br />
<br />
[[Image:Street.jpg|left|x110px|top]] <br />
[http://www.math.wisc.edu/~street Brian Street]<br><br />
Princeton University, 2007<br><br />
Assistant Professor<br><br />
street at math.wisc.edu<br />
<br />
[[Image:Zlatos.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~zlatos Andrej Zlatoš]<br><br />
Caltech, 2003<br><br />
Professor<br><br />
zlatos at math.wisc.edu<br />
<br />
=='''Postdocs'''==<br />
<br />
[[Image:Beichman.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~beichman Jennifer Beichman]<br><br />
University of Michigan, 2013<br><br />
Van Vleck Assistant Professor<br><br />
beichman at math.wisc.edu<br />
<br />
[[Image:Benguria.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~benguria Soledad Benguria]<br><br />
University of Wisconsin, 2014<br><br />
Van Vleck Assistant Professor<br><br />
benguria at math.wisc.edu<br />
<br />
[[Image:Choi.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~kchoi Kyudong Choi]<br><br />
University of Texas, 2012<br><br />
Van Vleck Assistant Professor<br><br />
kchoi at math.wisc.edu<br />
<br />
[[Image:Cook.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~bcook Brian Cook]<br><br />
University of British Columbia, 2010<br><br />
Van Vleck Assistant Professor<br><br />
bcook at math.wisc.edu<br />
<br />
[[Image:Lin.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~jessica Jessica Lin]<br><br />
University of Chicago, 2014<br><br />
Van Vleck Assistant Professor<br><br />
jessica at math.wisc.edu<br />
<br />
[[Image:Yao.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~yaoyao Yao Yao]<br><br />
UCLA, 2012<br><br />
Van Vleck Assistant Professor<br><br />
yaoyao at math.wisc.edu<br />
<br />
=='''[[Emeriti]]'''==<br />
<br />
[[Image:Wainger.jpg|left|x100px|top]]<br />
Stephen Wainger<br><br />
University of Chicago, 1961<br><br />
Professor Emeritus<br><br />
wainger at math.wisc.edu<br />
<br />
[[Image:anagel1.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~nagel Alexander Nagel]<br><br />
Columbia University, 1971<br><br />
Professor Emeritus<br><br />
nagel at math.wisc.edu<br />
<br />
=='''[[Former Members]]'''==<br />
<br />
[[Image:Ionescu.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~ionescu Alexandru Ionescu]<br><br />
Princeton University, 1999<br><br />
<br />
[[Image:Nazarov.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~nazarov Fëdor Nazarov]<br><br />
St. Petersburg State University, 1993<br><br />
<br />
[[Image:Kiselev.jpg|left|x110px|top]]<br />
[http://www.math.wisc.edu/~kiselev Alexander Kiselev]<br><br />
Caltech, 1996<br></div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Dynamics&diff=21255Dynamics2021-07-21T15:28:21Z<p>Nagreen: Created page with "The Dynamics Caucus. Content goes here."</p>
<hr />
<div>The Dynamics Caucus. <br />
<br />
Content goes here.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Main_Page&diff=21254Main Page2021-07-21T15:27:50Z<p>Nagreen: /* Math Seminars at UW-Madison */</p>
<hr />
<div><br />
== Welcome to the University of Wisconsin Math Department Wiki ==<br />
<br />
This site is by and for the faculty, students and staff of the UW Mathematics Department. It contains useful information about the department, not always available from other sources. Pages can only be edited by members of the department but are viewable by everyone. <br />
<br />
*[[Getting Around Van Vleck]]<br />
<br />
*[[Computer Help]] <br />
<br />
*[[Connecting/Using our research servers]]<br />
<br />
*[[Graduate Student Guide]]<br />
<br />
*[[Teaching Resources]]<br />
<br />
== Research groups at UW-Madison ==<br />
<br />
*[[Algebra]]<br />
*[[Analysis]]<br />
*[[Applied|Applied Mathematics]]<br />
*[https://www.math.wisc.edu/wiki/index.php/Research_at_UW-Madison_in_DifferentialEquations Differential Equations]<br />
*[[Dynamics]]<br />
*[[Geometry and Topology]]<br />
* [http://www.math.wisc.edu/~lempp/logic.html Logic]<br />
*[[Probability]]<br />
<br />
== Math Seminars at UW-Madison ==<br />
<br />
*[[Colloquia|Colloquium]]<br />
*[[Algebra_and_Algebraic_Geometry_Seminar|Algebra and Algebraic Geometry Seminar]]<br />
*[[Algebra_in_Statistics_and_Computation_Seminar|Algebra in Statistics and Computation Seminar]]<br />
*[[Analysis_Seminar|Analysis Seminar]]<br />
*[[Applied/ACMS|Applied and Computational Math Seminar]]<br />
*[https://www.math.wisc.edu/wiki/index.php/Applied_Algebra_Seminar_Spring_2020 Applied Algebra Seminar]<br />
*[[Cookie_seminar|Cookie Seminar]]<br />
*[[Dynamics Special Lecture]]<br />
*[[Geometry_and_Topology_Seminar|Geometry and Topology Seminar]]<br />
*[[Group_Theory_Seminar|Group Theory Seminar]]<br />
*[[Matroids_seminar|Matroids seminar]]<br />
*[[Networks_Seminar|Networks Seminar]]<br />
*[[NTS|Number Theory Seminar]]<br />
*[[PDE_Geometric_Analysis_seminar| PDE and Geometric Analysis Seminar]]<br />
*[[Probability_Seminar|Probability Seminar]]<br />
* [http://www.math.wisc.edu/~lempp/conf/swlc.html Southern Wisconsin Logic Colloquium]<br />
*[[Research Recruitment Seminar]]<br />
*[[Topology and Singularities Seminar]]<br />
<br />
=== Graduate Student Seminars ===<br />
<br />
*[[AMS_Student_Chapter_Seminar|AMS Student Chapter Seminar]]<br />
*[[Graduate_Algebraic_Geometry_Seminar|Graduate Algebraic Geometry Seminar]]<br />
*[[Graduate_Applied_Algebra_Seminar|Graduate Applied Algebra Seminar]]<br />
*[[Applied/GPS| GPS Applied Math Seminar]]<br />
*[[NTSGrad_Fall_2020|Graduate Number Theory/Representation Theory Seminar]]<br />
*[[Symplectic_Geometry_Seminar|Symplectic Geometry Seminar]]<br />
*[[Math843Seminar| Math 843 Homework Seminar]]<br />
*[[Graduate_student_reading_seminar|Graduate Probability Reading Seminar]]<br />
*[[Summer_stacks|Summer 2012 Stacks Reading Group]]<br />
*[[Graduate_Student_Singularity_Theory]]<br />
*[[Graduate/Postdoc Topology and Singularities Seminar]]<br />
*[[Shimura Varieties Reading Group]]<br />
*[[Summer graduate harmonic analysis seminar]]<br />
*[[Graduate Logic Seminar]]<br />
*[[SIAM Student Chapter Seminar]]<br />
*[[Summer 2019 Algebraic Geometry Reading Group]]<br />
*[[CCA Reading Group]]<br />
<br />
=== Other ===<br />
*[https://sites.google.com/site/uwmadisondrp/home Directed Reading Program]<br />
*[[Madison Math Circle]]<br />
*[[High School Math Night]]<br />
*[http://www.siam-uw.org/ UW-Madison SIAM Student Chapter]<br />
*[http://www.math.wisc.edu/%7Emathclub/ UW-Madison Math Club]<br />
*[[Putnam Club]]<br />
*[[Undergraduate Math Competition]]<br />
*[[Basic Linux Seminar]]<br />
*[[Basic HTML Seminar]]<br />
<br />
== Graduate Program ==<br />
<br />
* [[Algebra Qualifying Exam]]<br />
* [[Analysis Qualifying Exam]]<br />
* [[Topology Qualifying Exam]]<br />
<br />
== Undergraduate Program ==<br />
<br />
* [[Overview of the undergraduate math program|Overview]]<br />
* [[Groups looking to hire students as tutors]]<br />
<br />
== Getting started with Wiki-stuff ==<br />
<br />
Consult the [http://meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.<br />
* [http://www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]<br />
* [http://www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]<br />
* [http://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Main_Page&diff=21253Main Page2021-07-21T15:27:31Z<p>Nagreen: /* Research groups at UW-Madison */</p>
<hr />
<div><br />
== Welcome to the University of Wisconsin Math Department Wiki ==<br />
<br />
This site is by and for the faculty, students and staff of the UW Mathematics Department. It contains useful information about the department, not always available from other sources. Pages can only be edited by members of the department but are viewable by everyone. <br />
<br />
*[[Getting Around Van Vleck]]<br />
<br />
*[[Computer Help]] <br />
<br />
*[[Connecting/Using our research servers]]<br />
<br />
*[[Graduate Student Guide]]<br />
<br />
*[[Teaching Resources]]<br />
<br />
== Research groups at UW-Madison ==<br />
<br />
*[[Algebra]]<br />
*[[Analysis]]<br />
*[[Applied|Applied Mathematics]]<br />
*[https://www.math.wisc.edu/wiki/index.php/Research_at_UW-Madison_in_DifferentialEquations Differential Equations]<br />
*[[Dynamics]]<br />
*[[Geometry and Topology]]<br />
* [http://www.math.wisc.edu/~lempp/logic.html Logic]<br />
*[[Probability]]<br />
<br />
== Math Seminars at UW-Madison ==<br />
<br />
*[[Colloquia|Colloquium]]<br />
*[[Algebra_and_Algebraic_Geometry_Seminar|Algebra and Algebraic Geometry Seminar]]<br />
*[[Algebra_in_Statistics_and_Computation_Seminar|Algebra in Statistics and Computation Seminar]]<br />
*[[Analysis_Seminar|Analysis Seminar]]<br />
*[[Applied/ACMS|Applied and Computational Math Seminar]]<br />
*[https://www.math.wisc.edu/wiki/index.php/Applied_Algebra_Seminar_Spring_2020 Applied Algebra Seminar]<br />
*[[Cookie_seminar|Cookie Seminar]]<br />
*[[Geometry_and_Topology_Seminar|Geometry and Topology Seminar]]<br />
*[[Group_Theory_Seminar|Group Theory Seminar]]<br />
*[[Matroids_seminar|Matroids seminar]]<br />
*[[Networks_Seminar|Networks Seminar]]<br />
*[[NTS|Number Theory Seminar]]<br />
*[[PDE_Geometric_Analysis_seminar| PDE and Geometric Analysis Seminar]]<br />
*[[Probability_Seminar|Probability Seminar]]<br />
* [http://www.math.wisc.edu/~lempp/conf/swlc.html Southern Wisconsin Logic Colloquium]<br />
*[[Research Recruitment Seminar]]<br />
*[[Topology and Singularities Seminar]]<br />
<br />
=== Graduate Student Seminars ===<br />
<br />
*[[AMS_Student_Chapter_Seminar|AMS Student Chapter Seminar]]<br />
*[[Graduate_Algebraic_Geometry_Seminar|Graduate Algebraic Geometry Seminar]]<br />
*[[Graduate_Applied_Algebra_Seminar|Graduate Applied Algebra Seminar]]<br />
*[[Applied/GPS| GPS Applied Math Seminar]]<br />
*[[NTSGrad_Fall_2020|Graduate Number Theory/Representation Theory Seminar]]<br />
*[[Symplectic_Geometry_Seminar|Symplectic Geometry Seminar]]<br />
*[[Math843Seminar| Math 843 Homework Seminar]]<br />
*[[Graduate_student_reading_seminar|Graduate Probability Reading Seminar]]<br />
*[[Summer_stacks|Summer 2012 Stacks Reading Group]]<br />
*[[Graduate_Student_Singularity_Theory]]<br />
*[[Graduate/Postdoc Topology and Singularities Seminar]]<br />
*[[Shimura Varieties Reading Group]]<br />
*[[Summer graduate harmonic analysis seminar]]<br />
*[[Graduate Logic Seminar]]<br />
*[[SIAM Student Chapter Seminar]]<br />
*[[Summer 2019 Algebraic Geometry Reading Group]]<br />
*[[CCA Reading Group]]<br />
<br />
=== Other ===<br />
*[https://sites.google.com/site/uwmadisondrp/home Directed Reading Program]<br />
*[[Madison Math Circle]]<br />
*[[High School Math Night]]<br />
*[http://www.siam-uw.org/ UW-Madison SIAM Student Chapter]<br />
*[http://www.math.wisc.edu/%7Emathclub/ UW-Madison Math Club]<br />
*[[Putnam Club]]<br />
*[[Undergraduate Math Competition]]<br />
*[[Basic Linux Seminar]]<br />
*[[Basic HTML Seminar]]<br />
<br />
== Graduate Program ==<br />
<br />
* [[Algebra Qualifying Exam]]<br />
* [[Analysis Qualifying Exam]]<br />
* [[Topology Qualifying Exam]]<br />
<br />
== Undergraduate Program ==<br />
<br />
* [[Overview of the undergraduate math program|Overview]]<br />
* [[Groups looking to hire students as tutors]]<br />
<br />
== Getting started with Wiki-stuff ==<br />
<br />
Consult the [http://meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.<br />
* [http://www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]<br />
* [http://www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]<br />
* [http://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Dynamics_Seminar_2020-2021&diff=21066Dynamics Seminar 2020-20212021-03-26T15:28:37Z<p>Nagreen: /* Spring 2021 */</p>
<hr />
<div>The [[Dynamics Seminar]] meets virtually on '''Wednesdays''' from '''2:30pm - 3:20pm'''.<br />
<br> <br />
For more information, contact Chenxi Wu.<br />
To sign up for the mailing list send an email from your wisc.edu address to dynamics+join@g-groups.wisc.edu<br />
<br />
Meetings are on Zoom. To get Zoom info email Chenxi Wu. <br />
<br />
<br />
<br />
[[Image:Hawk.jpg|thumb|300px]]<br />
<br />
== Spring 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|February 3<br />
|Daniel Woodhouse (Oxford)<br />
|Quasi-isometric Rigidity of graphs of free groups with cyclic edge groups<br />
| <br />
|-<br />
|February 10<br />
|John Mackay (Bristol)<br />
|Poincaré profiles on graphs and groups, and a coarse geometric<br />
dichotomy<br />
| <br />
|-<br />
|February 17<br />
|Benjamin Branman (Wisconsin)<br />
|Spaces of Pants Decompositions for Surfaces of Infinite Type<br />
| <br />
|-<br />
|February 24<br />
|Uri Bader (Weizmann Institute)<br />
|Totally geodesic submanifolds of hyperbolic manifolds and arithmeticity.<br />
| <br />
|-<br />
|March 3<br />
|Omri Sarig (Weizmann Institute)<br />
|(Dis)continuity of Lyapunov exponents for surface diffeomorphisms (joint with J. Buzz and S. Crovisier)<br />
| <br />
|-<br />
|March 10<br />
|Chris Leininger (Rice University)<br />
|Billiards, symbolic coding, and cone metrics<br />
| <br />
|-<br />
|March 17<br />
|Ethan Farber (Boston College)<br />
|Constructing pseudo-Anosovs from expanding interval maps<br />
|<br />
|-<br />
|March 24<br />
|Jon Chaika (Utah)<br />
|A strange limit of horocycle ergodic measures in a stratum of<br />
translation surfaces<br />
|<br />
|-<br />
|March 31<br />
|Harrison Bray (George Mason)<br />
|Volume-entropy rigidity for convex real projective manifolds<br />
|<br />
|-<br />
|April 7<br />
|Claire Burrin （ETH Zurich)<br />
|TBA<br />
|<br />
|-<br />
|April 21<br />
|Kasra Rafi (Toronto)<br />
|TBA<br />
|<br />
|-<br />
|April 28<br />
|Matt Bainbridge (Indiana)<br />
|TBA<br />
|}<br />
<br />
== Fall 2020 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|September 16<br />
|Andrew Zimmer (Wisconsin)<br />
|An introduction to Anosov representations I<br />
| <br />
|-<br />
|September 23<br />
|Andrew Zimmer (Wisconsin)<br />
|An introduction to Anosov representations II<br />
| <br />
|-<br />
|September 30<br />
|Chenxi Wu (Wisconsin)<br />
|Asymptoic translation lengths on curve complexes and free factor complexes<br />
|<br />
|-<br />
|October 7<br />
|Kathryn Lindsey (Boston College)<br />
|Slices of Thurston's Master Teapot<br />
|<br />
|-<br />
|October 14<br />
|Daniel Thompson (Ohio State)<br />
|Strong ergodic properties for equilibrium states in non-positive curvature<br />
|<br />
|-<br />
|October 21<br />
|Giulio Tiozzo (Toronto)<br />
|Metrics on trees, laminations, and core entropy<br />
| <br />
|-<br />
|October 28<br />
|No talk<br />
|No talk<br />
|<br />
|-<br />
|November 4<br />
|Clark Butler (Princeton)<br />
|"Unbounded uniformizations of Grkmov hyperbolic spaces"<br />
| <br />
|-<br />
|November 11<br />
|Subhadip Dey (Yale)<br />
|Patterson-Sullivan measures for Anosov subgroups<br />
| <br />
|-<br />
|November 18<br />
|Nattalie Tamam (UCSD)<br />
|Effective equidistribution of horospherical flows in infinite volume<br />
| <br />
|-<br />
|November 25<br />
|Tariq Osman (Queens)<br />
|Limit Theorems for Quadratic Weyl Sums<br />
| <br />
|-<br />
|December 2<br />
|Wenyu Pan (Chicago)<br />
|Exponential mixing of geodesic flows for geometrically finite hyperbolic manifolds with cusps<br />
| <br />
|-<br />
|}<br />
<br />
== Spring Abstracts ==<br />
<br />
===Daniel Woodhouse===<br />
<br />
"Quasi-isometric Rigidity of graphs of free groups with cyclic edge groups"<br />
<br />
Let F be a finitely rank free group.<br />
Let w_1 and w_2 be suitable random/generic elements in F.<br />
Consider the HNN extension G = <F, t | t w_1 t^{-1} = w_2 >.<br />
It is known from existing results that G will be 1-ended and hyperbolic.<br />
We have shown that G is quasi-isometrically rigid.<br />
That is to say that if a f.g. group H is quasi-isometric to G, then G and H are virtually isomorphic.<br />
The full result is for finite graphs of groups with virtually free vertex groups and and two-ended edge groups, but the statement is more technical -- not all such groups are QI-rigid.<br />
The main argument involves applying a new proof of Leighton's graph covering theorem.<br />
This is joint work with Sam Shepherd.<br />
<br />
===John Mackay===<br />
<br />
"Poincaré profiles on graphs and groups, and a coarse geometric<br />
dichotomy"<br />
<br />
The separation profile of an infinite graph was introduced by<br />
Benjamini-Schramm-Timar. It is a function which measures how<br />
well-connected the graph is by how hard it is to cut finite subgraphs<br />
into small pieces. In earlier joint work with David Hume and Romain<br />
Tessera, we introduced Poincaré profiles, generalising this concept by<br />
using p-Poincaré inequalities to measure the connected-ness of<br />
subgraphs. I will discuss this family of invariants, their applications<br />
to coarse embedding problems, and recent work finding the profiles of<br />
all connected unimodular Lie groups, where a dichotomy is exhibited.<br />
Joint with Hume and Tessera.<br />
<br />
===Benjamin Branman===<br />
<br />
"Spaces of Pants Decompositions for Surfaces of Infinite Type"<br />
<br />
We study the pants graph of surfaces of infinite type. When S is a surface of infinite type, the usual definition of the graph of pants decompositions yields a graph with infinitely many connected-components. In the first part of our talk, we study this disconnected graph. In particular, we show that the extended mapping class group of S is isomorphic to a proper subgroup of of the pants graph, in contrast to the finite-type case. In the second part of the talk, motivated by the Metaconjecture of Ivanov, we seek to endow the pants graph with additional structure. To this end, we define a coarser topology on the pants graph than the topology inherited from the graph structure. We show that our new space is path-connected, and that its automorphism group is isomorphic to the extended mapping class group.<br />
<br />
<br />
===Uri Bader===<br />
"Totally geodesic submanifolds of hyperbolic manifolds and arithmeticity."<br />
<br />
Compact hyperbolic manifolds are very interesting geometric objects.<br />
Maybe surprisingly, they are also interesting from an algebraic point of view:<br />
They are completely determined by their fundamental groups (this is Mostow's Theorem),<br />
which could be seen as a subgroup of the integer valued invertible matrices in some dimension, GL_n(Z).<br />
When the fundamental group is the Z-points of some algebraic subgroup of GL_n we say that the manifold is arithmetic.<br />
A question arises: is there a simple geometric criterion for arithmeticity for hyperbolic manifolds?<br />
Such a criterion, relating arithmeticity to the existence of totally geodesic submanifolds, was conjectured by Reid and by McMullen.<br />
In a recent work with Fisher, Miller and Stover we proved this conjecture.<br />
Our proof is based on the theory of AREA, namely Algebraic Representation of Ergodic Actions, which I have developed with Alex Furman in recent years.<br />
In this talk I will try to survey the subject in a colloquial manner.<br />
<br />
<br />
===Omri Sarig===<br />
<br />
"(Dis)continuity of Lyapunov exponents for surface diffeomorphisms" (joint with J. Buzz and S. Crovisier)"<br />
<br />
Let f be an infinitely differentiable surface diffeomorphism. Suppose we are given a sequence of ergodic invariant measures m_n which converge weak star to an ergodic limit m. What do we need to know on m_n to guarantee that the Lyapunov exponents of m_n converge to the Lyapunov exponents of m?<br />
The main result is that if m has positive entropy, and the entropy of m_n converges to the entropy of m, then the Lyapunov exponents of m_n converge to the Lyapunov exponents of m.<br />
This is joint work with J. Buzzi and S. Crovisier.<br />
<br />
===Chris Leininger===<br />
<br />
"Billiards, symbolic coding, and cone metrics"<br />
<br />
Given a polygon in the Euclidean or hyperbolic plane a billiard trajectory in the polygon is the geodesic path of a particle in the polygon bouncing off the sides so that the angle of reflection is equal to the angle incidence. A billiard trajectory determines a symbolic coding via the sides of the polygon encountered. In this talk I will describe joint work with Erlandsson and Sadanand showing the extent to which the set of all coding sequences, the bounce spectrum, determines the shape of a hyperbolic polygon. We completely characterize those polygons which are billiard rigid (the generic case), meaning that they are determined up to isometry by their bounce spectrum. When rigidity fails for a polygon P, we parameterize the space of polygons having the same bounce spectrum at P. These results for billiards are a consequence of a rigidity/flexibility theorem for negatively curved hyperbolic cone metrics. In the talk I will explain the theorem about hyperbolic billiards, comparing/contrasting it with the Euclidean case (earlier work with Duchin, Erlandsson, and Sadanand). Then I will explain the relationship with hyperbolic cone metrics, state our rigidity/flexibility theorem for such metrics, and as time allows describe some of the ideas involved in the proofs.<br />
<br />
===Ethan Farber===<br />
<br />
"Constructing pseudo-Anosovs from expanding interval maps"<br />
<br />
The celebrated Nielsen-Thurston classification of surface homeomorphisms says that, up to isotopy, there are three types of homeomorphisms of a closed, connected surface: (1) finite order, (2) reducible, and (3) pseudo-Anosov. Of these three types, pseudo-Anosovs are the most intriguing to dynamicists, with connections to symbolic dynamics and flat geometry. In this talk we investigate a construction of generalized pseudo-Anosovs from interval maps, first introduced by de Carvalho. In particular, for a certain class of interval maps we give necessary and sufficient conditions for the construction to produce a true pseudo-Anosov, which may be recast in terms of the kneading data of the interval map. We also describe a bijection between such interval maps and the rationals in the open unit interval which captures the kneading data, and which increases monotonically in the entropy of the interval map.<br />
<br />
===Jon Chaika===<br />
<br />
"A strange limit of horocycle ergodic measures in a stratum of<br />
translation surfaces"<br />
<br />
The main result of this talk is that in the space of unit area<br />
translation surfaces with one cone point there is a weak-star limit of<br />
measures on periodic horocycles that is fully supported in the<br />
7-dimensional space but gives positive measure to a 3-dimensional<br />
submanifold. As a consequence we obtain a non-genericity result for the<br />
horocycle flow in this space. I will define the terminology. This is joint<br />
work with Osama Khalil and John Smillie.<br />
<br />
<br />
== Fall Abstracts ==<br />
<br />
===Andrew Zimmer===<br />
<br />
"An introduction to Anosov representations"<br />
<br />
Anosov representations are a special class of representations of finitely generated groups into Lie groups, which are defined using ideas from dynamics (namely, the theory of Anosov flows). In this talk, I will explain the definition (in a special case), give some examples, and describe some properties. I will focus on the case of representations into the general linear group where no background knowledge about Lie groups is required.<br />
<br />
<br />
===Chenxi Wu===<br />
<br />
"Asymptotic translation lengths on curve complexes and free factor complexes"<br />
<br />
The curve complex of a closed surface is a simplicial complex where the vertices are simple closed curves up to isotopy and faces are curves that are disjoint, and an analogy for the curve complex in the setting of Out(F_n) is the free factor complex. A pseudo-Anosov map induces a map from the curve graph to itself, and a basic question is to study the asymptotic translation length which is known to be a non-zero rational number. I will review some prior results on the study of this asymptotic translation length, as well as some of their analogies in the setting of free factor complexes. The latter part is an ongoing project with Hyrungryul Baik and Dongryul Kim. [https://wuchenxi.github.io/graph.pdf Slides]<br />
<br />
<br />
===Kathryn Lindsey===<br />
<br />
"Slices of Thurston's Master Teapot"<br />
<br />
Thurston's Master Teapot is the closure of the set of all points $(z,\lambda) \in \mathbb{C} \times \mathbb{R}$ such that $\lambda$ is the growth rate of a critically periodic unimodal self-map of an interval and $z$ is a Galois conjugate of $\lambda$. I will present a new characterization of which points are in this set. This characterization gives a way to think of each horizontal slice of the Master Teapot as an analogy of the Mandelbrot set for a "restricted iterated function system." An application of this characterization is that the Master Teapot is not invariant under the map $(z,\lambda) \mapsto (-z,\lambda)$. This presentation is based on joint work with Chenxi Wu.<br />
<br />
<br />
===Daniel Thompson===<br />
<br />
"Strong ergodic properties for equilibrium states in non-positive curvature"<br />
<br />
Equilibrium states for geodesic flows over compact rank 1 manifolds and sufficiently regular potential functions were studied by Burns, Climenhaga, Fisher and myself. We showed that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. In this talk, I will describe some recent results on the dynamical properties of these unique equilibrium states. We show that these equilibrium states have the Kolmogorov property (joint with Ben Call), and that approximations of the equilibrium states by regular closed geodesics asymptotically satisfy a type of Central Limit Theorem (joint with Tianyu Wang).<br />
<br />
===Giulio Tiozzo===<br />
<br />
"Metrics on trees, laminations, and core entropy"<br />
<br />
The notion of core entropy, defined as the entropy of the restriction to the Hubbard tree,<br />
was formulated by W. Thurston to produce a combinatorial invariant which captures the topological complexity of polynomial Julia sets and varies in a rich fractal way over parameter space.<br />
<br />
Core entropy has been so far defined by looking at a Markov partition on the tree, or by a combinatorial construction involving infinite graphs. We will introduce a new interpretation of core entropy based on metrics on trees and, dually, on transverse measures on laminations<br />
defining the Julia set.<br />
<br />
On the one hand, this will define a new notion of transverse measures on quadratic laminations, completing the analogy with laminations on surfaces on the “other side” of Sullivan’s dictionary.<br />
Moreover, this is also related to a question of Milnor on a piecewise-linear analogue of Thurston iteration on Teichmueller space.<br />
<br />
===Clark Butler===<br />
<br />
"Unbounded uniformizations of Grkmov hyperbolic spaces"<br />
<br />
In a fundamental work Bonk, Heinonen, and Koskela established a conformal correspondence between Gromov hyperbolic spaces and bounded uniform spaces (satisfying certain additional hypotheses) that generalized the classical conformal correspondence between the Euclidean unit disk and the hyperbolic plane. We prove a similar conformal correspondence between Gromov hyperbolic spaces and unbounded uniform spaces that extends the correspondence between the Euclidean upper half plane and the hyperbolic plane. Our primary application of this uniformization procedure is to extend a number of recent results of Bjorn-Bjorn-Shanmugalingam for Besov spaces on compact metric spaces to Besov spaces on proper metric spaces. These results are derived through a Patterson-Sullivan-esque construction by realizing certain measures on these metric spaces as the boundary values of measures on uniformized Gromov hyperbolic spaces having these metric spaces as their boundaries.<br />
<br />
===Subhadip Dey===<br />
<br />
"Patterson-Sullivan measures for Anosov subgroups"<br />
<br />
Patterson-Sullivan measures were introduced by Patterson (1976) and Sullivan (1979) to study the Kleinian groups and their limit sets. In this talk, we discuss an extension of this classical construction for $P$-Anosov subgroups $\Gamma$ of $G$, where $G$ is a real semisimple Lie group and $P<G$ is a parabolic subgroup. In parallel with the theory for Kleinian groups, we will discuss how one can understand the Hausdorff dimension of the limit set of $\Gamma$ in terms of a certain critical exponent. This is a joint work with Michael Kapovich.<br />
<br />
===Nattalie Tamam===<br />
<br />
"Effective equidistribution of horospherical flows in infinite volume"<br />
<br />
Horospherical flows in homogeneous spaces have been studied intensively over the last several decades and have many surprising applications in various fields. Many basic results are under the assumption that the volume of the space is finite, which is crucial as many basic ergodic theorems fail in the setting of an infinite measure space.In the talk we will discuss the infinite volume setting, and specifically, when can we expect horospherical orbits to equidistribute. Our goal will be to provide an effective equidistribution result, with polynomial rate, for horospherical orbits in the frame bundle of certain infinite volume hyperbolic manifolds. This is a joint work with Jacqueline Warren.<br />
<br />
===Tariq Osman===<br />
<br />
"Limit Theorems for Quadratic Weyl Sums"<br />
<br />
Consider exponential sums of the form $S_N(x, \alpha) := \sum_{n = 1}^{N}e(1/2 n^2 x + n\alpha)$, known as quadratic Weyl sums. We will use homogeneous dynamics to establish a limiting distribution for $\frac{1}{\sqrt N} |S_N(x, \alpha)|$, when $\alpha$ is a fixed rational, and $x$ is chosen uniformly from the unit interval. Time permitting, we will study the tails of the limiting distribution to show that this is not the central limit theorem in disguise. (This is joint work with Francesco Cellarosi)<br />
<br />
===Wenyu Pan===<br />
<br />
"Exponential mixing of geodesic flows for geometrically finite hyperbolic manifolds with cusps"<br />
<br />
Let $\mathbb{H}^n$ be the hyperbolic $n$-space and $\Gamma$ be a geometrically finite discrete subgroup in $\operatorname{Isom}_{+}(\mathbb{H}^n)$ with parabolic elements. In the joint work with Jialun LI, we establish exponential mixing of the geodesic flow over the unit tangent bundle $T^1(\Gamma\backslash \mathbb{H}^n)$ with respect to the Bowen-Margulis-Sullivan measure. Our approach is to construct coding for the geodesic flow and then prove a Dolgopyat-type spectral estimate for the corresponding transfer operator. In the talk, I am planning to explain the construction of the coding. I will also discuss the application of obtaining a resonance-free region for the resolvent on $\Gamma\backslash \mathbb{H}^n$.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Applied/ACMS&diff=20900Applied/ACMS2021-02-26T19:51:57Z<p>Nagreen: /* Spring 2021 */</p>
<hr />
<div>__NOTOC__<br />
<br />
= Applied and Computational Mathematics Seminar =<br />
<br />
*'''When:''' Fridays at 2:25pm (except as otherwise indicated)<br />
*'''Where:''' 901 Van Vleck Hall<br />
*'''Organizers:''' [http://www.math.wisc.edu/~qinli/ Qin Li], [http://www.math.wisc.edu/~spagnolie/ Saverio Spagnolie] and [http://www.math.wisc.edu/~jeanluc Jean-Luc Thiffeault]<br />
*'''To join the ACMS mailing list:''' Send mail to [mailto:acms+join@g-groups.wisc.edu acms+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
== Spring 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
| Jan 29<br />
|Christina Kurzthaler (Princeton)<br />
|''[[Applied/ACMS/absS21#Christina Kurzthaler (Princeton)|Complex Transport Phenomena]]''<br />
|Jean-Luc<br />
|-<br />
| Feb 5<br />
|[https://www.math.wisc.edu/~remondtiedre/ Antoine Remond-Tiedrez] (UW)<br />
|''[[Applied/ACMS/absS21#Antoine Remond-Tiedrez (UW)|Instability of an Anisotropic Micropolar Fluid]]''<br />
|Spagnolie<br />
|-<br />
| Feb 12<br />
|[http://appliedmaths.sun.ac.za/~htouchette/ Hugo Touchette] (Stellenbosch University)<br />
|''[[Applied/ACMS/absS21#Hugo Touchette (Stellenbosch University)| Large deviation theory: From physics to mathematics and back]]''<br />
|Jean-Luc<br />
|-<br />
| Feb 19<br />
|[https://www.meteo.physik.uni-muenchen.de/~tijana.pfander/ Tijana Pfander] (Ludwig-Maximilians-University of Munich)<br />
|''[[Applied/ACMS/absS21#Tijana Pfander (UW)|Towards next generation data assimilation algorithms for convective scale applications]]''<br />
|Chen<br />
|-<br />
| Feb 26<br />
|[https://www.math.wisc.edu/~qdeng37/ Quanling Deng] (UW)<br />
|''[[Applied/ACMS/absS21#Quanling Deng (UW)|Spectral approximation of elliptic operators by softFEM, isogeometric analysis, and the hybrid high-order method]]''<br />
|Stechmann and Chen<br />
|-<br />
| Mar 5<br />
|[https://cms.caltech.edu/people/obruno Oscar Bruno] (Caltech)<br />
|''[[Applied/ACMS/absS21#Oscar Bruno (Caltech)|Interpolated Factored Green Function]]''<br />
|Zepeda-Núñez<br />
|-<br />
| Mar 12<br />
|[https://www.math.umass.edu/directory/faculty/yulong-lu Yulong Lu] (University of Massachusetts)<br />
|''[[Applied/ACMS/absS21#Yulong Lu (University of Massachusetts)|TBA]]''<br />
|Li<br />
|-<br />
| Mar 19<br />
|Michelle DiBenedetto (University of Washington)<br />
|TBA<br />
|Jean-Luc<br />
|-<br />
| Mar 26<br />
||[http://www.math.ucsd.edu/~mleok/ Melvin Leok] (UCSD)<br />
|''[[Applied/ACMS/absS21#Melvin Leok (UCSD)|TBA]]''<br />
|Zepeda-Núñez<br />
|<br />
|-<br />
| Apr 2<br />
|[https://drexel.edu/coas/faculty-research/faculty-directory/mondaini-cecilia/ Cecilia Mondaini] (Drexel University)<br />
|TBA<br />
|Chen<br />
|-<br />
| Apr 9<br />
|[https://shukaidu.github.io/ Shukai Du] (UW-Madison)<br />
|TBA<br />
|Stechmann<br />
|-<br />
| Apr 16<br />
|[http://www.mathjunge.com/ Matthew Junge] (CUNY)<br />
|TBA<br />
|Bates<br />
|-<br />
| Apr 23<br />
|Reserved<br />
|<br />
|Spagnolie<br />
|-<br />
|}<br />
<br />
== Future semesters ==<br />
<br />
*[[Applied/ACMS/Fall2021|Fall 2021]]<br />
<br />
<br />
----<br />
<br />
== Archived semesters ==<br />
<br />
*[[Applied/ACMS/Fall2020|Fall 2020]]<br />
*[[Applied/ACMS/Spring2020|Spring 2020]]<br />
*[[Applied/ACMS/Fall2019|Fall 2019]]<br />
*[[Applied/ACMS/Spring2019|Spring 2019]]<br />
*[[Applied/ACMS/Fall2018|Fall 2018]]<br />
*[[Applied/ACMS/Spring2018|Spring 2018]]<br />
*[[Applied/ACMS/Fall2017|Fall 2017]]<br />
*[[Applied/ACMS/Spring2017|Spring 2017]]<br />
*[[Applied/ACMS/Fall2016|Fall 2016]]<br />
*[[Applied/ACMS/Spring2016|Spring 2016]]<br />
*[[Applied/ACMS/Fall2015|Fall 2015]]<br />
*[[Applied/ACMS/Spring2015|Spring 2015]]<br />
*[[Applied/ACMS/Fall2014|Fall 2014]]<br />
*[[Applied/ACMS/Spring2014|Spring 2014]]<br />
*[[Applied/ACMS/Fall2013|Fall 2013]]<br />
*[[Applied/ACMS/Spring2013|Spring 2013]]<br />
*[[Applied/ACMS/Fall2012|Fall 2012]]<br />
*[[Applied/ACMS/Spring2012|Spring 2012]]<br />
*[[Applied/ACMS/Fall2011|Fall 2011]]<br />
*[[Applied/ACMS/Spring2011|Spring 2011]]<br />
*[[Applied/ACMS/Fall2010|Fall 2010]]<br />
<!--<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring10.html Spring 2010]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall09.html Fall 2009]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring09.html Spring 2009]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall08.html Fall 2008]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring08.html Spring 2008]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall07.html Fall 2007]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring07.html Spring 2007]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall06.html Fall 2006]<br />
--><br />
<br />
<br><br />
<br />
----<br />
Return to the [[Applied|Applied Mathematics Group Page]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Applied/ACMS&diff=20899Applied/ACMS2021-02-26T19:51:43Z<p>Nagreen: /* Spring 2021 */</p>
<hr />
<div>__NOTOC__<br />
<br />
= Applied and Computational Mathematics Seminar =<br />
<br />
*'''When:''' Fridays at 2:25pm (except as otherwise indicated)<br />
*'''Where:''' 901 Van Vleck Hall<br />
*'''Organizers:''' [http://www.math.wisc.edu/~qinli/ Qin Li], [http://www.math.wisc.edu/~spagnolie/ Saverio Spagnolie] and [http://www.math.wisc.edu/~jeanluc Jean-Luc Thiffeault]<br />
*'''To join the ACMS mailing list:''' Send mail to [mailto:acms+join@g-groups.wisc.edu acms+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
== Spring 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
| Jan 29<br />
|Christina Kurzthaler (Princeton)<br />
|''[[Applied/ACMS/absS21#Christina Kurzthaler (Princeton)|Complex Transport Phenomena]]''<br />
|Jean-Luc<br />
|-<br />
| Feb 5<br />
|[https://www.math.wisc.edu/~remondtiedre/ Antoine Remond-Tiedrez] (UW)<br />
|''[[Applied/ACMS/absS21#Antoine Remond-Tiedrez (UW)|Instability of an Anisotropic Micropolar Fluid]]''<br />
|Spagnolie<br />
|-<br />
| Feb 12<br />
|[http://appliedmaths.sun.ac.za/~htouchette/ Hugo Touchette] (Stellenbosch University)<br />
|''[[Applied/ACMS/absS21#Hugo Touchette (Stellenbosch University)| Large deviation theory: From physics to mathematics and back]]''<br />
|Jean-Luc<br />
|-<br />
| Feb 19<br />
|[https://www.meteo.physik.uni-muenchen.de/~tijana.pfander/ Tijana Pfander] (Ludwig-Maximilians-University of Munich)<br />
|''[[Applied/ACMS/absS21#Tijana Pfander (UW)|Towards next generation data assimilation algorithms for convective scale applications]]''<br />
|Chen<br />
|-<br />
| Feb 26<br />
|[https://www.math.wisc.edu/~qdeng37/ Quanling Deng] (UW)<br />
|''[[Applied/ACMS/absS21#Quanling Deng (UW)|Spectral approximation of elliptic operators by softFEM, isogeometric analysis, and the hybrid high-order method]]''<br />
|Stechmann and Chen<br />
|-<br />
| Mar 5<br />
|[https://cms.caltech.edu/people/obruno Oscar Bruno] (Caltech)<br />
|''[[Applied/ACMS/absS21#Oscar Bruno (Caltech)|Interpolated Factored Green Functions]]''<br />
|Zepeda-Núñez<br />
|-<br />
| Mar 12<br />
|[https://www.math.umass.edu/directory/faculty/yulong-lu Yulong Lu] (University of Massachusetts)<br />
|''[[Applied/ACMS/absS21#Yulong Lu (University of Massachusetts)|TBA]]''<br />
|Li<br />
|-<br />
| Mar 19<br />
|Michelle DiBenedetto (University of Washington)<br />
|TBA<br />
|Jean-Luc<br />
|-<br />
| Mar 26<br />
||[http://www.math.ucsd.edu/~mleok/ Melvin Leok] (UCSD)<br />
|''[[Applied/ACMS/absS21#Melvin Leok (UCSD)|TBA]]''<br />
|Zepeda-Núñez<br />
|<br />
|-<br />
| Apr 2<br />
|[https://drexel.edu/coas/faculty-research/faculty-directory/mondaini-cecilia/ Cecilia Mondaini] (Drexel University)<br />
|TBA<br />
|Chen<br />
|-<br />
| Apr 9<br />
|[https://shukaidu.github.io/ Shukai Du] (UW-Madison)<br />
|TBA<br />
|Stechmann<br />
|-<br />
| Apr 16<br />
|[http://www.mathjunge.com/ Matthew Junge] (CUNY)<br />
|TBA<br />
|Bates<br />
|-<br />
| Apr 23<br />
|Reserved<br />
|<br />
|Spagnolie<br />
|-<br />
|}<br />
<br />
== Future semesters ==<br />
<br />
*[[Applied/ACMS/Fall2021|Fall 2021]]<br />
<br />
<br />
----<br />
<br />
== Archived semesters ==<br />
<br />
*[[Applied/ACMS/Fall2020|Fall 2020]]<br />
*[[Applied/ACMS/Spring2020|Spring 2020]]<br />
*[[Applied/ACMS/Fall2019|Fall 2019]]<br />
*[[Applied/ACMS/Spring2019|Spring 2019]]<br />
*[[Applied/ACMS/Fall2018|Fall 2018]]<br />
*[[Applied/ACMS/Spring2018|Spring 2018]]<br />
*[[Applied/ACMS/Fall2017|Fall 2017]]<br />
*[[Applied/ACMS/Spring2017|Spring 2017]]<br />
*[[Applied/ACMS/Fall2016|Fall 2016]]<br />
*[[Applied/ACMS/Spring2016|Spring 2016]]<br />
*[[Applied/ACMS/Fall2015|Fall 2015]]<br />
*[[Applied/ACMS/Spring2015|Spring 2015]]<br />
*[[Applied/ACMS/Fall2014|Fall 2014]]<br />
*[[Applied/ACMS/Spring2014|Spring 2014]]<br />
*[[Applied/ACMS/Fall2013|Fall 2013]]<br />
*[[Applied/ACMS/Spring2013|Spring 2013]]<br />
*[[Applied/ACMS/Fall2012|Fall 2012]]<br />
*[[Applied/ACMS/Spring2012|Spring 2012]]<br />
*[[Applied/ACMS/Fall2011|Fall 2011]]<br />
*[[Applied/ACMS/Spring2011|Spring 2011]]<br />
*[[Applied/ACMS/Fall2010|Fall 2010]]<br />
<!--<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring10.html Spring 2010]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall09.html Fall 2009]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring09.html Spring 2009]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall08.html Fall 2008]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring08.html Spring 2008]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall07.html Fall 2007]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring07.html Spring 2007]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall06.html Fall 2006]<br />
--><br />
<br />
<br><br />
<br />
----<br />
Return to the [[Applied|Applied Mathematics Group Page]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Applied/ACMS&diff=20898Applied/ACMS2021-02-26T19:51:27Z<p>Nagreen: </p>
<hr />
<div>__NOTOC__<br />
<br />
= Applied and Computational Mathematics Seminar =<br />
<br />
*'''When:''' Fridays at 2:25pm (except as otherwise indicated)<br />
*'''Where:''' 901 Van Vleck Hall<br />
*'''Organizers:''' [http://www.math.wisc.edu/~qinli/ Qin Li], [http://www.math.wisc.edu/~spagnolie/ Saverio Spagnolie] and [http://www.math.wisc.edu/~jeanluc Jean-Luc Thiffeault]<br />
*'''To join the ACMS mailing list:''' Send mail to [mailto:acms+join@g-groups.wisc.edu acms+join@g-groups.wisc.edu].<br />
<br />
<br><br />
<br />
== Spring 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
| Jan 29<br />
|Christina Kurzthaler (Princeton)<br />
|''[[Applied/ACMS/absS21#Christina Kurzthaler (Princeton)|Complex Transport Phenomena]]''<br />
|Jean-Luc<br />
|-<br />
| Feb 5<br />
|[https://www.math.wisc.edu/~remondtiedre/ Antoine Remond-Tiedrez] (UW)<br />
|''[[Applied/ACMS/absS21#Antoine Remond-Tiedrez (UW)|Instability of an Anisotropic Micropolar Fluid]]''<br />
|Spagnolie<br />
|-<br />
| Feb 12<br />
|[http://appliedmaths.sun.ac.za/~htouchette/ Hugo Touchette] (Stellenbosch University)<br />
|''[[Applied/ACMS/absS21#Hugo Touchette (Stellenbosch University)| Large deviation theory: From physics to mathematics and back]]''<br />
|Jean-Luc<br />
|-<br />
| Feb 19<br />
|[https://www.meteo.physik.uni-muenchen.de/~tijana.pfander/ Tijana Pfander] (Ludwig-Maximilians-University of Munich)<br />
|''[[Applied/ACMS/absS21#Tijana Pfander (UW)|Towards next generation data assimilation algorithms for convective scale applications]]''<br />
|Chen<br />
|-<br />
| Feb 26<br />
|[https://www.math.wisc.edu/~qdeng37/ Quanling Deng] (UW)<br />
|''[[Applied/ACMS/absS21#Quanling Deng (UW)|Spectral approximation of elliptic operators by softFEM, isogeometric analysis, and the hybrid high-order method]]''<br />
|Stechmann and Chen<br />
|-<br />
| Mar 5<br />
|[https://cms.caltech.edu/people/obruno Oscar Bruno] (Caltech)<br />
|''[[Applied/ACMS/absS21#Oscar Bruno (Caltech)|Interpolated Factored Green Function]]''<br />
|Zepeda-Núñez<br />
|-<br />
| Mar 12<br />
|[https://www.math.umass.edu/directory/faculty/yulong-lu Yulong Lu] (University of Massachusetts)<br />
|''[[Applied/ACMS/absS21#Yulong Lu (University of Massachusetts)|TBA]]''<br />
|Li<br />
|-<br />
| Mar 19<br />
|Michelle DiBenedetto (University of Washington)<br />
|TBA<br />
|Jean-Luc<br />
|-<br />
| Mar 26<br />
||[http://www.math.ucsd.edu/~mleok/ Melvin Leok] (UCSD)<br />
|''[[Applied/ACMS/absS21#Melvin Leok (UCSD)|TBA]]''<br />
|Zepeda-Núñez<br />
|<br />
|-<br />
| Apr 2<br />
|[https://drexel.edu/coas/faculty-research/faculty-directory/mondaini-cecilia/ Cecilia Mondaini] (Drexel University)<br />
|TBA<br />
|Chen<br />
|-<br />
| Apr 9<br />
|[https://shukaidu.github.io/ Shukai Du] (UW-Madison)<br />
|TBA<br />
|Stechmann<br />
|-<br />
| Apr 16<br />
|[http://www.mathjunge.com/ Matthew Junge] (CUNY)<br />
|TBA<br />
|Bates<br />
|-<br />
| Apr 23<br />
|Reserved<br />
|<br />
|Spagnolie<br />
|-<br />
|}<br />
<br />
== Future semesters ==<br />
<br />
*[[Applied/ACMS/Fall2021|Fall 2021]]<br />
<br />
<br />
----<br />
<br />
== Archived semesters ==<br />
<br />
*[[Applied/ACMS/Fall2020|Fall 2020]]<br />
*[[Applied/ACMS/Spring2020|Spring 2020]]<br />
*[[Applied/ACMS/Fall2019|Fall 2019]]<br />
*[[Applied/ACMS/Spring2019|Spring 2019]]<br />
*[[Applied/ACMS/Fall2018|Fall 2018]]<br />
*[[Applied/ACMS/Spring2018|Spring 2018]]<br />
*[[Applied/ACMS/Fall2017|Fall 2017]]<br />
*[[Applied/ACMS/Spring2017|Spring 2017]]<br />
*[[Applied/ACMS/Fall2016|Fall 2016]]<br />
*[[Applied/ACMS/Spring2016|Spring 2016]]<br />
*[[Applied/ACMS/Fall2015|Fall 2015]]<br />
*[[Applied/ACMS/Spring2015|Spring 2015]]<br />
*[[Applied/ACMS/Fall2014|Fall 2014]]<br />
*[[Applied/ACMS/Spring2014|Spring 2014]]<br />
*[[Applied/ACMS/Fall2013|Fall 2013]]<br />
*[[Applied/ACMS/Spring2013|Spring 2013]]<br />
*[[Applied/ACMS/Fall2012|Fall 2012]]<br />
*[[Applied/ACMS/Spring2012|Spring 2012]]<br />
*[[Applied/ACMS/Fall2011|Fall 2011]]<br />
*[[Applied/ACMS/Spring2011|Spring 2011]]<br />
*[[Applied/ACMS/Fall2010|Fall 2010]]<br />
<!--<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring10.html Spring 2010]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall09.html Fall 2009]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring09.html Spring 2009]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall08.html Fall 2008]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring08.html Spring 2008]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall07.html Fall 2007]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Spring07.html Spring 2007]<br />
*[http://www.math.wisc.edu/~jeanluc/ACMS/archive/Fall06.html Fall 2006]<br />
--><br />
<br />
<br><br />
<br />
----<br />
Return to the [[Applied|Applied Mathematics Group Page]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Dynamics_Seminar_2020-2021&diff=20817Dynamics Seminar 2020-20212021-02-11T20:50:40Z<p>Nagreen: </p>
<hr />
<div>The [[Dynamics Seminar]] meets virtually on '''Wednesdays''' from '''2:30pm - 3:20pm'''.<br />
<br> <br />
For more information, contact Chenxi Wu.<br />
To sign up for the mailing list send an email from your wisc.edu address to dynamics+join@g-groups.wisc.edu<br />
<br />
The zoom login info is as follows:<br />
<br />
Join Zoom Meeting<br />
https://uwmadison.zoom.us/j/93164776780?pwd=anE2Y3RhWk1VR0lDa0hnMzhPTTJEUT09<br />
<br />
Meeting ID: 931 6477 6780<br />
Passcode: 819612<br />
<br />
<br />
[[Image:Hawk.jpg|thumb|300px]]<br />
<br />
== Spring 2021 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|February 3<br />
|Daniel Woodhouse (Oxford)<br />
|Quasi-isometric Rigidity of graphs of free groups with cyclic edge groups<br />
| <br />
|-<br />
|February 10<br />
|John Mackay (Bristol)<br />
|Poincaré profiles on graphs and groups, and a coarse geometric<br />
dichotomy<br />
| <br />
|-<br />
|February 17<br />
|Benjamin Branman (Wisconsin)<br />
|Spaces of Pants Decompositions for Surfaces of Infinite Type<br />
| <br />
|-<br />
|February 24<br />
|Uri Bader (Weizmann Institute)<br />
|TBA<br />
| <br />
|-<br />
|March 3<br />
|Omri Sarig (Weizmann Institute)<br />
|TBA<br />
| <br />
|-<br />
|March 10<br />
|Chris Leininger (Rice University)<br />
|TBA<br />
| <br />
|-<br />
|March 17<br />
|Ethan Farber (Boston College)<br />
|TBA<br />
|<br />
|-<br />
|March 24<br />
|Jon Chaika (Utah)<br />
|TBA<br />
|<br />
|-<br />
|March 31<br />
|Harrison Bray (George Mason)<br />
|TBA<br />
|<br />
|-<br />
|April 28<br />
|Matt Bainbridge (Indiana)<br />
|TBA<br />
|}<br />
<br />
== Fall 2020 ==<br />
<br />
{| cellpadding="8"<br />
!align="left" | date<br />
!align="left" | speaker<br />
!align="left" | title<br />
!align="left" | host(s)<br />
|-<br />
|September 16<br />
|Andrew Zimmer (Wisconsin)<br />
|An introduction to Anosov representations I<br />
| <br />
|-<br />
|September 23<br />
|Andrew Zimmer (Wisconsin)<br />
|An introduction to Anosov representations II<br />
| <br />
|-<br />
|September 30<br />
|Chenxi Wu (Wisconsin)<br />
|Asymptoic translation lengths on curve complexes and free factor complexes<br />
|<br />
|-<br />
|October 7<br />
|Kathryn Lindsey (Boston College)<br />
|Slices of Thurston's Master Teapot<br />
|<br />
|-<br />
|October 14<br />
|Daniel Thompson (Ohio State)<br />
|Strong ergodic properties for equilibrium states in non-positive curvature<br />
|<br />
|-<br />
|October 21<br />
|Giulio Tiozzo (Toronto)<br />
|Metrics on trees, laminations, and core entropy<br />
| <br />
|-<br />
|October 28<br />
|No talk<br />
|No talk<br />
|<br />
|-<br />
|November 4<br />
|Clark Butler (Princeton)<br />
|"Unbounded uniformizations of Grkmov hyperbolic spaces"<br />
| <br />
|-<br />
|November 11<br />
|Subhadip Dey (Yale)<br />
|Patterson-Sullivan measures for Anosov subgroups<br />
| <br />
|-<br />
|November 18<br />
|Nattalie Tamam (UCSD)<br />
|Effective equidistribution of horospherical flows in infinite volume<br />
| <br />
|-<br />
|November 25<br />
|Tariq Osman (Queens)<br />
|Limit Theorems for Quadratic Weyl Sums<br />
| <br />
|-<br />
|December 2<br />
|Wenyu Pan (Chicago)<br />
|Exponential mixing of geodesic flows for geometrically finite hyperbolic manifolds with cusps<br />
| <br />
|-<br />
|}<br />
<br />
== Spring Abstracts ==<br />
<br />
===Daniel Woodhouse===<br />
<br />
"Quasi-isometric Rigidity of graphs of free groups with cyclic edge groups"<br />
<br />
Let F be a finitely rank free group.<br />
Let w_1 and w_2 be suitable random/generic elements in F.<br />
Consider the HNN extension G = <F, t | t w_1 t^{-1} = w_2 >.<br />
It is known from existing results that G will be 1-ended and hyperbolic.<br />
We have shown that G is quasi-isometrically rigid.<br />
That is to say that if a f.g. group H is quasi-isometric to G, then G and H are virtually isomorphic.<br />
The full result is for finite graphs of groups with virtually free vertex groups and and two-ended edge groups, but the statement is more technical -- not all such groups are QI-rigid.<br />
The main argument involves applying a new proof of Leighton's graph covering theorem.<br />
This is joint work with Sam Shepherd.<br />
<br />
===John Mackay===<br />
<br />
"Poincaré profiles on graphs and groups, and a coarse geometric<br />
dichotomy"<br />
<br />
The separation profile of an infinite graph was introduced by<br />
Benjamini-Schramm-Timar. It is a function which measures how<br />
well-connected the graph is by how hard it is to cut finite subgraphs<br />
into small pieces. In earlier joint work with David Hume and Romain<br />
Tessera, we introduced Poincaré profiles, generalising this concept by<br />
using p-Poincaré inequalities to measure the connected-ness of<br />
subgraphs. I will discuss this family of invariants, their applications<br />
to coarse embedding problems, and recent work finding the profiles of<br />
all connected unimodular Lie groups, where a dichotomy is exhibited.<br />
Joint with Hume and Tessera.<br />
<br />
== Fall Abstracts ==<br />
<br />
===Andrew Zimmer===<br />
<br />
"An introduction to Anosov representations"<br />
<br />
Anosov representations are a special class of representations of finitely generated groups into Lie groups, which are defined using ideas from dynamics (namely, the theory of Anosov flows). In this talk, I will explain the definition (in a special case), give some examples, and describe some properties. I will focus on the case of representations into the general linear group where no background knowledge about Lie groups is required.<br />
<br />
<br />
===Chenxi Wu===<br />
<br />
"Asymptotic translation lengths on curve complexes and free factor complexes"<br />
<br />
The curve complex of a closed surface is a simplicial complex where the vertices are simple closed curves up to isotopy and faces are curves that are disjoint, and an analogy for the curve complex in the setting of Out(F_n) is the free factor complex. A pseudo-Anosov map induces a map from the curve graph to itself, and a basic question is to study the asymptotic translation length which is known to be a non-zero rational number. I will review some prior results on the study of this asymptotic translation length, as well as some of their analogies in the setting of free factor complexes. The latter part is an ongoing project with Hyrungryul Baik and Dongryul Kim. [https://wuchenxi.github.io/graph.pdf Slides]<br />
<br />
<br />
===Kathryn Lindsey===<br />
<br />
"Slices of Thurston's Master Teapot"<br />
<br />
Thurston's Master Teapot is the closure of the set of all points $(z,\lambda) \in \mathbb{C} \times \mathbb{R}$ such that $\lambda$ is the growth rate of a critically periodic unimodal self-map of an interval and $z$ is a Galois conjugate of $\lambda$. I will present a new characterization of which points are in this set. This characterization gives a way to think of each horizontal slice of the Master Teapot as an analogy of the Mandelbrot set for a "restricted iterated function system." An application of this characterization is that the Master Teapot is not invariant under the map $(z,\lambda) \mapsto (-z,\lambda)$. This presentation is based on joint work with Chenxi Wu.<br />
<br />
<br />
===Daniel Thompson===<br />
<br />
"Strong ergodic properties for equilibrium states in non-positive curvature"<br />
<br />
Equilibrium states for geodesic flows over compact rank 1 manifolds and sufficiently regular potential functions were studied by Burns, Climenhaga, Fisher and myself. We showed that if the higher rank set does not carry full topological pressure then the equilibrium state is unique. In this talk, I will describe some recent results on the dynamical properties of these unique equilibrium states. We show that these equilibrium states have the Kolmogorov property (joint with Ben Call), and that approximations of the equilibrium states by regular closed geodesics asymptotically satisfy a type of Central Limit Theorem (joint with Tianyu Wang).<br />
<br />
===Giulio Tiozzo===<br />
<br />
"Metrics on trees, laminations, and core entropy"<br />
<br />
The notion of core entropy, defined as the entropy of the restriction to the Hubbard tree,<br />
was formulated by W. Thurston to produce a combinatorial invariant which captures the topological complexity of polynomial Julia sets and varies in a rich fractal way over parameter space.<br />
<br />
Core entropy has been so far defined by looking at a Markov partition on the tree, or by a combinatorial construction involving infinite graphs. We will introduce a new interpretation of core entropy based on metrics on trees and, dually, on transverse measures on laminations<br />
defining the Julia set.<br />
<br />
On the one hand, this will define a new notion of transverse measures on quadratic laminations, completing the analogy with laminations on surfaces on the “other side” of Sullivan’s dictionary.<br />
Moreover, this is also related to a question of Milnor on a piecewise-linear analogue of Thurston iteration on Teichmueller space.<br />
<br />
===Clark Butler===<br />
<br />
"Unbounded uniformizations of Grkmov hyperbolic spaces"<br />
<br />
In a fundamental work Bonk, Heinonen, and Koskela established a conformal correspondence between Gromov hyperbolic spaces and bounded uniform spaces (satisfying certain additional hypotheses) that generalized the classical conformal correspondence between the Euclidean unit disk and the hyperbolic plane. We prove a similar conformal correspondence between Gromov hyperbolic spaces and unbounded uniform spaces that extends the correspondence between the Euclidean upper half plane and the hyperbolic plane. Our primary application of this uniformization procedure is to extend a number of recent results of Bjorn-Bjorn-Shanmugalingam for Besov spaces on compact metric spaces to Besov spaces on proper metric spaces. These results are derived through a Patterson-Sullivan-esque construction by realizing certain measures on these metric spaces as the boundary values of measures on uniformized Gromov hyperbolic spaces having these metric spaces as their boundaries.<br />
<br />
===Subhadip Dey===<br />
<br />
"Patterson-Sullivan measures for Anosov subgroups"<br />
<br />
Patterson-Sullivan measures were introduced by Patterson (1976) and Sullivan (1979) to study the Kleinian groups and their limit sets. In this talk, we discuss an extension of this classical construction for $P$-Anosov subgroups $\Gamma$ of $G$, where $G$ is a real semisimple Lie group and $P<G$ is a parabolic subgroup. In parallel with the theory for Kleinian groups, we will discuss how one can understand the Hausdorff dimension of the limit set of $\Gamma$ in terms of a certain critical exponent. This is a joint work with Michael Kapovich.<br />
<br />
===Nattalie Tamam===<br />
<br />
"Effective equidistribution of horospherical flows in infinite volume"<br />
<br />
Horospherical flows in homogeneous spaces have been studied intensively over the last several decades and have many surprising applications in various fields. Many basic results are under the assumption that the volume of the space is finite, which is crucial as many basic ergodic theorems fail in the setting of an infinite measure space.In the talk we will discuss the infinite volume setting, and specifically, when can we expect horospherical orbits to equidistribute. Our goal will be to provide an effective equidistribution result, with polynomial rate, for horospherical orbits in the frame bundle of certain infinite volume hyperbolic manifolds. This is a joint work with Jacqueline Warren.<br />
<br />
===Tariq Osman===<br />
<br />
"Limit Theorems for Quadratic Weyl Sums"<br />
<br />
Consider exponential sums of the form $S_N(x, \alpha) := \sum_{n = 1}^{N}e(1/2 n^2 x + n\alpha)$, known as quadratic Weyl sums. We will use homogeneous dynamics to establish a limiting distribution for $\frac{1}{\sqrt N} |S_N(x, \alpha)|$, when $\alpha$ is a fixed rational, and $x$ is chosen uniformly from the unit interval. Time permitting, we will study the tails of the limiting distribution to show that this is not the central limit theorem in disguise. (This is joint work with Francesco Cellarosi)<br />
<br />
===Wenyu Pan===<br />
<br />
"Exponential mixing of geodesic flows for geometrically finite hyperbolic manifolds with cusps"<br />
<br />
Let $\mathbb{H}^n$ be the hyperbolic $n$-space and $\Gamma$ be a geometrically finite discrete subgroup in $\operatorname{Isom}_{+}(\mathbb{H}^n)$ with parabolic elements. In the joint work with Jialun LI, we establish exponential mixing of the geodesic flow over the unit tangent bundle $T^1(\Gamma\backslash \mathbb{H}^n)$ with respect to the Bowen-Margulis-Sullivan measure. Our approach is to construct coding for the geodesic flow and then prove a Dolgopyat-type spectral estimate for the corresponding transfer operator. In the talk, I am planning to explain the construction of the coding. I will also discuss the application of obtaining a resonance-free region for the resolvent on $\Gamma\backslash \mathbb{H}^n$.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Putnam_Club&diff=20756Putnam Club2021-02-04T14:48:08Z<p>Nagreen: </p>
<hr />
<div>==Spring 2020==<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
==Fall 2020==<br />
<br />
[[File:Bascom-fall-1500x500-1500x500.jpg ]] <br />
<br />
<span style="color:Indigo"><font size="5"> <div style="text-align: center;">WELCOME TO THE FALL 2020 PUTNAM CLUB!</div></font></span><br />
<br />
<br />
<div style="text-align: center;"><span style="color:crimson"><font size="3">Organizers: Dima Arinkin, Mihaela Ifrim, Tatiana Shcherbyna, Botong Wang </font></span><br />
<br />
The Putnam Exam, offered by the Mathematical Association of America, is the premier American math competition for undergraduate students. It a regular year is given on the first Saturday in December. The exam consists of 12 problems, 6 in the 3 hour morning session and 6 in the 3 hour afternoon session. Each problem is worth 10 points, so the maximum score is 120. National winners usually get around 100 points. The median score is generally around 0-2 points. This is a difficult exam with many interesting and fun problems.<br />
<br />
<div style="text-align: center;"><span style="color:crimson">However, this year things are a bit unusual. The 2020 Putnam competition is postponed until February 20, 2021. It is not determined yet whether the competition will be in person or online yet.Here is the original statement on the official webpage of the contest:</span> </div><br />
<br />
''Due to the coronavirus crisis, most students in the US and Canada are unable to return to campuses this fall. Therefore, the 81st Putnam Competition, originally scheduled for Fall 2020, will be postponed until February 20, 2021. If most students can return to campuses in the spring, the competition on that date can go forward in much the same form as in previous years. On the other hand, if most students are unable to return to campuses in the spring, the competition on that date will proceed in an unofficial mode, with no proctors, no prizes, no awards, but with solution papers submitted for grading by participants themselves and scores reported back privately to the individual participants.<br />
<br />
''<br />
<br />
<div style="text-align: center;"><div style="background-color:pink;">[http://kskedlaya.org/putnam-archive/ <font size="3">Old exams and more information on the Putnam competition.</font>]</div></div><br />
<br />
<br />
The UW is also participating in the Virginia Tech Regional Mathematics Contest. This is an individual competition with seven problems in 2.5 hours. Many schools use it as a kind of rehearsal for the Putnam. You can find more information [http://intranet.math.vt.edu/people/plinnell/Vtregional/ <span style="color:crimson"> over here.</div>] <br />
<br />
<div style="text-align: center;"><font size="3">'''We will have online meetings every Wednesday 5:00-6:30PM. ''' </font></div><br />
<br />
<br />
<div style="text-align: center;"><div style="background-color:pink;"> <font size="3">The first meeting of this semester will happen on the 16th of September 2020! Please let all your colleagues know that we are continuing the Putnam Club and we are enthusiastic and hopeful we will keep you all engaged throughout the semester!</font> </div></div><br />
<br />
<br />
{| class="wikitable" style="color:red; background-color:#ffffcc;" cellpadding="50"<br />
|Meeting 16 SEPT 2020<br />
Mihaela Ifrim<br />
|ZOOM MEETING: Hi there, You are invited to a Zoom meeting. <br />
When: Sep 16, 2020 05:00 PM Central Time (US and Canada) <br />
<br />
Register in advance for this meeting:<br />
https://uwmadison.zoom.us/meeting/register/tJApcumhrz4pEtJRe_o0WTGM26u2zTM8T6J5 After registering, you will receive a confirmation email containing information about joining the meeting.<br />
<br />
You will meet us all at some point in time:) First two meetings will be presented by Mihaela. We will each teach two consecutive meetings. <br />
<br />
<span style="color:blue">UPDATE (09/17/2020): e met and all the documents (problems discussed and solutions given by you in class, are now shared with you via onedrive (app related to your outlook wisc account!)). I have also sent to you an invitation to use the witheboard attached to the same wisc account! But, do not feel discouraged in case you want to join later! You are always welcomed! </span><br />
<br />
<span style="color:green"> Please check out the following book: '''Putnam and Beyond'''! We will use it throughout the meetings!</span><br />
<br />
The first list of problems is posted! Please email me if you want access to it! [[File:Putnam_Problem_Set_1.pdf ]]<br />
<br />
<br />
|-<br />
|Meeting 23 SEPT 2020<br />
Mihaela Ifrim <br />
<br />
<br />
| Zoom: Please join using the above link!<br />
<span style="color:Indigo">We discussed the problems given in the Putnam_Problem_Set_1 and their solutions are now posted on the shared folder.<br />
In addition I have also gave you the following problems to think at. [[File:Putnam_September_23_2020.pdf]]</span> <br />
<br />
<br />
<br />
<br />
|-<br />
|Meeting 30 SEPT 2020<br />
Tatyana Shcherbyna <br />
<br />
| ZOOM: Please consider joining ! <br />
<span style="color:Indigo">The next meeting will cover NUMBER THEORY! Please see the attached list of problems!! Enjoy!!! [[File:Putnam_nt1(1).pdf ]]</span><br />
<br />
<br />
<br />
|-<br />
|Meeting 7 OCT 2020<br />
Tatyana Shcherbyna <br />
<br />
| ZOOM: Please join! Here is the list of problems for the next meeting!!! [[File:Putnam_nt2.pdf]] If you have solutions for the previous proposed set of problems, please email them so that we can compile a set of solutions. We will post them in our onedrive folder. If you are new, please email us and we will give access to it!<br />
|-<br />
<br />
-<br />
|Meeting 14 OCT 2020<br />
Mihaela Ifrim <br />
<br />
| ZOOM: Please join! Here is the list of problems for the next meeting!!! [[File:Putnam-Problems-and-Theory-form-Oct-14th-2020-short.pdf ]] A more detailed list is posted on onedrive! <br />
|-<br />
<br />
-<br />
|Meeting 21 OCT 2020<br />
Mihaela Ifrim <br />
<br />
| ZOOM: Please join! We worked out some of the problem proposed on the previous meeting!!! [[File:Putnam-Problems-and-Theory-form-Oct-14th-2020-short.pdf ]] Some solutions will be posted on onedrive! Reach out to us if you would like access to the solutions and you did not register yet! <br />
|-<br />
-<br />
|Meeting 28 OCT 2020<br />
Tatyana Shcherbina <br />
<br />
| ZOOM: Please join! The next two meeting will cover '''Polynomials'''! Please see the attached list of problems!! Enjoy!!! [[File: putnam_pol1.pdf ]] <br />
|-<br />
<br />
<br />
|Meeting 4 Nov 2020<br />
Tatyana Shcherbina <br />
<br />
| Here are the theory discussed on Oct 28 and hints to the problems [[File: putnam_pol1_hints.pdf ]] and [[File: polynomials_theory.pdf ]] <br />
|-<br />
<br />
<br />
<br />
|Meeting 4 Nov 2020<br />
Tatyana Shcherbina <br />
<br />
| Here are the solutions of Polynomials problems [[File: putnam_Oct28_sol.pdf ]] <br />
|-<br />
<br />
<br />
|Meeting 11 Nov 2020<br />
Dima Arinkin <br />
<br />
| On ZOOM (the link is above). The topic for the next two meetings is '''Linear algebra'''. Here are the [[Media:linear_algebra_2020.pdf | problems]] I plan to discuss, and here is a short [http://math.northwestern.edu/putnam/filom/Linear_and_Abstract_Algebra.pdf summary] (from NWU) of some common linear algebra techniques for math contests.<br />
|-<br />
<br />
|Meeting 18 Nov 2020<br />
Dima Arinkin <br />
<br />
| On ZOOM (the link is above). Continuing with the linear algebra: here are the [[Media:linear_algebra_2_2020.pdf | problems]] (including some left-overs from the last time). <br />
|-<br />
<br />
|Meeting 2 Dec 2020<br />
Botong Wang <br />
<br />
| On ZOOM (the link is above). The topic for the next two meetings is '''limits of sequences''' (sections 3.1.3, 3.1.4, 3.1.5 in Putnam and Beyond). We will go over some basic theorems and discuss how to apply them. Here is the [[Media:Putnam_limits.pdf | worksheet]].<br />
|-<br />
|}<br />
[[File:WiscFall.jpg ]]<br />
<br />
----<br />
<br />
<br />
<br />
<br />
==Spring 2020==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. <br />
<br />
The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
* February 5: [[Media:Putnam_Binomial2020.pdf | Binomial coefficients and generating functions]] [[Media:Putnam_Binomial2020_answer.pdf | (Answers and hints)]] Botong <br />
* February 19: [[Media:Putnam_Number_theory2020.pdf | Number theory]] [[Media:Putnam_Number2020.pdf | (Answers and hints)]] Botong<br />
* March 4 and 11: [[Media: Inequalities.pdf | Inequalities]] ( Note comming up!) Kim<br />
<br />
==Fall 2019==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. '''The first meeting will be on the 25th of September in Van Vleck hall, room B139.'''<br />
<br />
We will continue using the [http://piazza.com/wisc/fall2018/putnam2018/ Piazza page] from last semester for discussions. The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
* September 25: [[Media:Putnam_problems_2017+2018.pdf | Introductory meeting]] Botong<br />
* October 2: [[Putnam.pdf | Integral inequalities]] Mihaela<br />
* October 9: [[Putnam.pdf | More about Integral inequalities]] (I will post notes on Wednesday morning and we will discuss more in class!) Mihaela<br />
* October 16: [[ODE.pdf | ODE of the first order]] Chanwoo<br />
* November 6: [[Media:Numbers.pdf | Number theory]] Dima<br />
* November 13: ??<br />
* November 20: [[Geometry.pdf | Geometry]] ( Note comming up!) Mihaela<br />
* November 27: [[No meeting! Thanksgiving! ]]<br />
* December 4: Last meeting of the semester! Please come and bring your friends too!! It will be fun! Mihaela<br />
<br />
<br />
<br />
<br />
==Spring 2019==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other Olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. The first meeting will be on the 6th of February in Van Vleck hall, room B139.<br />
<br />
<br />
<br />
'''! Important announcement:''' We will begin preparing you for the Putnam exam earlier this year. The material covered will be presented gradually. More details will be explained to you during your first meeting of this semester (Feb 6th). We put together a Piazza account that will help the participants to discuss and collaborate with their pairs. Here is the link you need to access in order to register for this "class": piazza.com/wisc/fall2018/putnam2018 . Our intervention on Piazza will be minimal (some of the instructors will, from time to time, visit the piazza questions and provide some help). Also, based on your requests, we have decided to structure our meetings in a way that will provide more insight on methods and certain tricks that are very often used in this type of math competitions. The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
* February 6: [[Media:Putnam_Basics_2019.pdf | The basics]] by Botong<br />
* February 13: Botong<br />
* February 20: Alex [[Media:Ordered_Sets.pdf | Ordered Sets]]<br />
* March 6th: Mihaela [[Media: Putnam.pdf | Algebra]]<br />
* March 13: Mihaela<br />
* March 27: Botong [[Media: Matrix.pdf | Matrices]]<br />
<br />
If this material is completely new to you then read through the definitions in the first section and try the interspersed exercises which are direct applications of the definitions. If you are familiar with the basic material then review the problem solving strategies and the example problems which directly utilize the techniques. Finally, if you are a veteran, go ahead and jump right to the exercises!<br />
* February 27: Alex: Review results from 2/20. Bring written solutions and/or be prepared to present your <br />
* March 6th: Mihaela<br />
* March 13: Mihaela<br />
etc.<br />
<br />
==Fall 2018==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. '''The first meeting will be on the 26th of September in Van Vleck hall, room B139.'''<br />
<br />
'''! Important announcement:''' We put together a Piazza account that will help the participants to discuss and collaborate with their pairs. Here is the link you need to access in order to register for this "class": piazza.com/wisc/fall2018/putnam2018 . Our intervention on Piazza will be minimal (some of the instructors will, from time to time, visit the piazza questions and provide some help). Also, based on your requests, we have decided to structure our meetings in a way that will provide more insight on methods and certain tricks that are very often used in this type of math competitions. The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
<br />
<br />
* September 26: topic [[Media:Putnam_26_sept_2018.pdf | Introductory meeting]] by Mihaela Ifrim. We covered only the first 3 problems. I encourage you to work out all the problems!<br />
<br />
* October 3: [[Media:Putnam_Oct_3_2018.pdf | Linear Algebra]] by George Craciun.<br />
<br />
* October 10: [[Media:Putnam polynomials 2018.pdf | Polynomials]] by Botong Wang.<br />
<br />
* October 17: [[Media:SeqPut18.pdf | Sequences]] by Alex Hanhart.<br />
<br />
* October 24: [[Media:Putnam_Oct_24th_2018.pdf | Convergence and Continuity]] by Mihaela Ifrim.<br />
<br />
* October 27: Virginia Tech Math Contest: 9-11:30am in VV B115.<br />
<br />
* October 31: [[Media:Putnam_Oct_31_2018.pdf | Geometry: cartesian coordinates, complex coordinates, circles and conics]] by George Craciun.<br />
<br />
* November 7: [[Media:Putnam_Combinatorics_2018.pdf | Combinatorics: Set theory and geometric combinatorics]] by Botong Wang.<br />
<br />
* November 14: [[Media:group.pdf | Techniques from Group Theory]] by Alex Hanhart.<br />
<br />
* November 21: '''No meeting''': Happy Thanksgiving!<br />
<br />
* November 28: [[Media:Putnam_November_28_2018.pdf | Number Theory]] by Mihaela Ifrim.<br />
<br />
* December 1: Putnam Competition! Starts at 9am!!!! '''The competition will take place December 1st 2018 (Saturday December 1st). The competition is administered in two sessions (A and B) on the same day, December 1st! Session A will start at 9 am and it will end at 12pm, and Session B will start at 2pm and it will end at 5pm. You should arrive at least 10 minutes prior to each session. You should bring your own pencils and pens (blue or black ink are permitted). Number 2 pencils with erasers will be needed to complete the identification forms. Erasers are also permitted, but nothing else will not be allowed in the exam room. I plan on bringing 20 such no 2 pencils. The exam room is B239 which is a class room located in Van Vleck Hall, at the level B2. Thank you all for participating and see you all there! If you have friends that would like to take the exam please encourage them to do so.'''<br />
<br />
==Spring 2018==<br />
<br />
The Putnam Club does not meet in the spring, but we had the fourth annual UW [[Undergraduate Math Competition]] on '''April 24th''', 2018, 5:30-8pm in VV B239.<br />
<br />
==Fall 2017==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139.<br />
<br />
* September 20: [[Media:Putnam092017.pdf | Introductory meeting]] by D.Arinkin<br />
* September 27: [[Media:Putnam092717.pdf | Equations with functions as unknowns]] by M.Ifrim (by request: here is [[Media:Putnam092717sol6.pdf | a solution to problem 6]]; problem 7 is problem B5 of 2016 Putnam exam; you can see the solution [http://kskedlaya.org/putnam-archive/2016s.pdf here]).<br />
* October 4: [[Media:Putnam100417.pdf | Inequalities ]] by G.Craciun.<br />
* October 11: [[Media:Putnam101117.pdf | Polynomials ]] by D.Arinkin.<br />
* October 18: [[Media:Putnam1(2)..pdf | Equations ]] by M. Ifrim<br />
* October 21: Virginia Tech Math Contest: 9-11:30am in VV B203.<br />
* October 25: Review of this year's [[Media:VTRMC2017.pdf | Virginia Tech Contest]] by G.Craciun.<br />
* November 1: [[Media:Putnam110117.pdf | Functions and calculus]] by D.Arinkin.<br />
* November 8: [[Media:Putnam1.pdf | Past Competitions]] by M.Ifrim<br />
* November 15: [[Media:Putnam111517.pdf | Recurrences]] by G.Craciun.<br />
* November 22: '''No meeting''': Happy Thanksgiving!<br />
* November 29: [[Media:Putnam112917.pdf | Complex numbers]] by D.Arinkin.<br />
* December 2: '''Putnam Exam''' in VVB115. Morning session: 9-12pm; Afternoon session: 2-5pm.<br />
<br />
==Spring 2016==<br />
<br />
The Putnam Club does not meet in the spring, but we had the third annual UW [[Undergraduate Math Competition]] on April 19th, 2017.<br />
<br />
==Fall 2016==<br />
<br />
* September 20: [[Media:Putnam092016.pdf | Introductory meeting]]<br />
* September 27: [[Media:Putnam092716.pdf | Calculus and analysis]]<br />
* October 4: [[Media:Putnam100416.pdf | Generating functions]] (by Vlad Matei) <br />
* October 11: [[Media:UWUMC2016.pdf | Review of last year's UW Math competition]]<br />
* October 18: [[Media:Putnam101816.pdf | Functional equations]]<br />
* October 22: Virginia Tech Math Contest<br />
* October 25: Review of this year's [[Media:vtrmc16.pdf | VT contest]]<br />
* November 1: [[Media:Putnam110116.pdf | Matrices]] (by Vlad Matei)<br />
* November 15: [[Media:Putnam111516.pdf | Two algebra problems]]<br />
* November 22: No meeting: Happy Thanksgiving!<br />
* November 29: [[Media:Putnam112916.pdf | Assorted problems]]<br />
* December 3: Putnam Exam: Morning session: 9am-noon, Afternoon session: 2-5pm in VV B135.<br />
<br />
==Spring 2016==<br />
<br />
The Putnam Club does not meet in the spring, but we had the second annual UW [[Undergraduate Math Competition]] on April 12th, 2016.<br />
<br />
==Fall 2015==<br />
. <br />
* September 23rd: [[Media:Putnam092315.pdf | Introductory meeting]]<br />
* September 30th: [[Media:Putnam093015.pdf | Pigeonhole principle]]<br />
* October 7th: Review of [[Media:UWUMC2015.pdf | 2015 UW math competition]]<br />
* October 14th: [[Media:Putnam101415.pdf | Matrices and determinants]]<br />
* October 21st: [[Media:Putnam102115.pdf | Virginia Tech practice]]<br />
* October 24th: Virginia Tech Regional Mathematics Contest: 9-11:30 am<br />
* October 28th: Review of the 2015 Virginia Tech contest.<br />
* November 4th: [[Media:PutnamProblemsOct12.pdf | Polynomials]]<br />
* November 11th: [[Media:PutnamProblemsNov11.pdf | Assorted problems]]<br />
* November 18th: [[Media:PutnamProblemsNov18.pdf | Assorted problems]]<br />
* No meeting on November 25th<br />
* December 2nd: TBA<br />
* December 5th: Putnam competition: Morning session: 9am-12pm, afternoon session: 2-5pm in VV B115.<br />
<br />
==Spring 2015==<br />
<br />
The Putnam Club does not meet in the spring, but we had our first UW [[Undergraduate Math Competition]]!<br />
<br />
==Fall 2014==<br />
<br />
* September 17: [[Media:Putnam091714.pdf | Introductory meeting]]<br />
* September 22: [[Media:Putnam092214.pdf | Coloring and pigeonhole principle]]<br />
* October 1st: Went through HW problems from last time<br />
* October 8th: [[Media:Putnam100814.pdf | Number theory]]<br />
* October 15th: [[Media:Putnam101514.pdf | Games]]<br />
* October 22nd: [[Media:VTRMC13.pdf | Problems from last year's Virginia Tech contest]]<br />
* October 25th: Virginia Tech Regional Mathematics Contest<br />
* October 29th: Review of this year's Virginia Tech contest<br />
* November 5th: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/06-inequalities.pdf Inequalities] and [http://www.math.cmu.edu/~lohp/docs/math/2014-295/05-functional.pdf functional equations]<br />
* November 12th: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/02-polynomials.pdf Polynomials]<br />
* November 19th: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/10-combinatorics.pdf Combinatorics]<br />
* December 3rd: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/08-recursions.pdf Recursions]<br />
* December 6th: Putnam competition: Morning session: 9am-12pm, Afternoon session: 2pm-5pm in Van Vleck B119<br />
* December 10th: Review of [http://www.artofproblemsolving.com/Forum/resources/files/undergraduate_competitions/Undergraduate_Competitions-Putnam-2014-23 this year's Putnam]<br />
<br />
==Fall 2013==<br />
<br />
<br />
* September 11: [[Media:Putnam091113.pdf | Introductory Meeting]]<br />
* September 18: [[Media:Putnam091813.pdf | Assorted Problems]] (by Yihe Dong) <br />
* September 25: [[Media:Putnam092513.pdf | Combinatorics]]<br />
* October 2: [[Media:Putnam100213.pdf | Matrices and Linear Algebra]]<br />
* October 9: [[Media:Putnam100913.pdf | Number Theory]]<br />
* October 16: [[Media:Putnam101613.pdf | Functions and Calculus]]<br />
* October 23: [[Media:Putnam102313.pdf | Polynomials]]<br />
* October 26: Virginia Tech Regional Mathematics Contest<br />
* October 30: [[Media:VTRMC13.pdf | Problems from this year's Virginia Tech contest]]<br />
* November 6: [[Media:Putnam110413.pdf | Games]]<br />
* November 13: [[Media:Putnam111113.pdf | Pigeonhole Principle]]<br />
* November 20: [[Media:Putnam112013.pdf | Extreme Principle]]<br />
* November 27: No meeting (Thanksgiving)<br />
* December 4: TBA<br />
* December 7: Putnam competition Morning session: 9am-12pm, afternoon session: 2-5pm in VV B239.<br />
<br />
==Fall 2012==<br />
<br />
* September 11: Introduction [[Media:Putnam2012IntroProblems.pdf | Problems]]<br />
* September 18: Some Basic Techniques [[Media:Putnam2012Week1Problems.pdf | Problems]]<br />
* September 25: Polynomials and Algebra [[Media:Putnam2012Week2Problems.pdf | Problems]]<br />
* October 2: Number Theory [[Media:Putnam2012Week3Problems.pdf | Problems]]<br />
* October 9: Calculus [[Media:Putnam2012Week4Problems.pdf | Problems]]<br />
* October 16: Games and Algorithms [[Media:Putnam2012Week5Problems.pdf | Problems]]<br />
* October 23: Combinatorics [[Media:Putnam2012Week6Problems.pdf | Problems]]<br />
* October 30: Probability [[Media:Putnam2012Week7Problems.pdf | Problems]]<br />
* November 6: Linear Algebra [[Media:Putnam2012Week8Problems.pdf | Problems]]<br />
* November 13: Grab Bag [[Media:Putnam2012Week9Problems.pdf | Problems]]<br />
* November 27: Grab Bag 2 [[Media:Putnam2012Week10Problems.pdf | Problems]]<br />
<br />
==Fall 2011==<br />
<br />
* September 21: Pigeonhole Principle (Brian Rice) [[Media:PutnamProblemsSept21.pdf | Problems]]<br />
* September 28: Introduction to Counting (Brian Rice) [[Media:PutnamProblemsSept28.pdf | Problems]]<br />
* October 5: Elementary Number Theory (Brian Rice) [[Media:PutnamProblemsOct5.pdf | Problems]], [[Media:PutnamProblemsOct5Hard.pdf | Problems (Hardcore)]]<br />
* October 12: Polynomials (Brian Rice) [[Media:PutnamProblemsOct12.pdf | Problems]], [[Media:PutnamProblemsOct12Hard.pdf | Problems (Hardcore)]]<br />
* October 19: A Grab Bag of Discrete Math (Brian Rice) [[Media:PutnamProblemsOct19.pdf | Problems]]<br />
* October 26: Calculus, Week 1 (Brian Rice) [[Media:PutnamProblemsOct26.pdf | Problems]]<br />
* November 2: Calculus, Week 2 (Brian Rice) [[Media:PutnamProblemsNov2.pdf | Problems]]<br />
* November 9: Linear and Abstract Algebra (Brian Rice) [[Media: PutnamProblemsNov9.pdf | Problems]]<br />
* November 16: Mock Putnam [[Media: MockPutnamProblems.pdf | Problems]], [[Media: MockPutnamSolutions.pdf | Solutions]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Putnam_Club&diff=20755Putnam Club2021-02-04T14:47:35Z<p>Nagreen: </p>
<hr />
<div><br />
<br />
<br />
==Fall 2020==<br />
<br />
[[File:Bascom-fall-1500x500-1500x500.jpg ]] <br />
<br />
<span style="color:Indigo"><font size="5"> <div style="text-align: center;">WELCOME TO THE FALL 2020 PUTNAM CLUB!</div></font></span><br />
<br />
<br />
<div style="text-align: center;"><span style="color:crimson"><font size="3">Organizers: Dima Arinkin, Mihaela Ifrim, Tatiana Shcherbyna, Botong Wang </font></span><br />
<br />
The Putnam Exam, offered by the Mathematical Association of America, is the premier American math competition for undergraduate students. It a regular year is given on the first Saturday in December. The exam consists of 12 problems, 6 in the 3 hour morning session and 6 in the 3 hour afternoon session. Each problem is worth 10 points, so the maximum score is 120. National winners usually get around 100 points. The median score is generally around 0-2 points. This is a difficult exam with many interesting and fun problems.<br />
<br />
<div style="text-align: center;"><span style="color:crimson">However, this year things are a bit unusual. The 2020 Putnam competition is postponed until February 20, 2021. It is not determined yet whether the competition will be in person or online yet.Here is the original statement on the official webpage of the contest:</span> </div><br />
<br />
''Due to the coronavirus crisis, most students in the US and Canada are unable to return to campuses this fall. Therefore, the 81st Putnam Competition, originally scheduled for Fall 2020, will be postponed until February 20, 2021. If most students can return to campuses in the spring, the competition on that date can go forward in much the same form as in previous years. On the other hand, if most students are unable to return to campuses in the spring, the competition on that date will proceed in an unofficial mode, with no proctors, no prizes, no awards, but with solution papers submitted for grading by participants themselves and scores reported back privately to the individual participants.<br />
<br />
''<br />
<br />
<div style="text-align: center;"><div style="background-color:pink;">[http://kskedlaya.org/putnam-archive/ <font size="3">Old exams and more information on the Putnam competition.</font>]</div></div><br />
<br />
<br />
The UW is also participating in the Virginia Tech Regional Mathematics Contest. This is an individual competition with seven problems in 2.5 hours. Many schools use it as a kind of rehearsal for the Putnam. You can find more information [http://intranet.math.vt.edu/people/plinnell/Vtregional/ <span style="color:crimson"> over here.</div>] <br />
<br />
<div style="text-align: center;"><font size="3">'''We will have online meetings every Wednesday 5:00-6:30PM. ''' </font></div><br />
<br />
<br />
<div style="text-align: center;"><div style="background-color:pink;"> <font size="3">The first meeting of this semester will happen on the 16th of September 2020! Please let all your colleagues know that we are continuing the Putnam Club and we are enthusiastic and hopeful we will keep you all engaged throughout the semester!</font> </div></div><br />
<br />
<br />
{| class="wikitable" style="color:red; background-color:#ffffcc;" cellpadding="50"<br />
|Meeting 16 SEPT 2020<br />
Mihaela Ifrim<br />
|ZOOM MEETING: Hi there, You are invited to a Zoom meeting. <br />
When: Sep 16, 2020 05:00 PM Central Time (US and Canada) <br />
<br />
Register in advance for this meeting:<br />
https://uwmadison.zoom.us/meeting/register/tJApcumhrz4pEtJRe_o0WTGM26u2zTM8T6J5 After registering, you will receive a confirmation email containing information about joining the meeting.<br />
<br />
You will meet us all at some point in time:) First two meetings will be presented by Mihaela. We will each teach two consecutive meetings. <br />
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<span style="color:blue">UPDATE (09/17/2020): e met and all the documents (problems discussed and solutions given by you in class, are now shared with you via onedrive (app related to your outlook wisc account!)). I have also sent to you an invitation to use the witheboard attached to the same wisc account! But, do not feel discouraged in case you want to join later! You are always welcomed! </span><br />
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<span style="color:green"> Please check out the following book: '''Putnam and Beyond'''! We will use it throughout the meetings!</span><br />
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The first list of problems is posted! Please email me if you want access to it! [[File:Putnam_Problem_Set_1.pdf ]]<br />
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|-<br />
|Meeting 23 SEPT 2020<br />
Mihaela Ifrim <br />
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| Zoom: Please join using the above link!<br />
<span style="color:Indigo">We discussed the problems given in the Putnam_Problem_Set_1 and their solutions are now posted on the shared folder.<br />
In addition I have also gave you the following problems to think at. [[File:Putnam_September_23_2020.pdf]]</span> <br />
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|-<br />
|Meeting 30 SEPT 2020<br />
Tatyana Shcherbyna <br />
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| ZOOM: Please consider joining ! <br />
<span style="color:Indigo">The next meeting will cover NUMBER THEORY! Please see the attached list of problems!! Enjoy!!! [[File:Putnam_nt1(1).pdf ]]</span><br />
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|-<br />
|Meeting 7 OCT 2020<br />
Tatyana Shcherbyna <br />
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| ZOOM: Please join! Here is the list of problems for the next meeting!!! [[File:Putnam_nt2.pdf]] If you have solutions for the previous proposed set of problems, please email them so that we can compile a set of solutions. We will post them in our onedrive folder. If you are new, please email us and we will give access to it!<br />
|-<br />
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-<br />
|Meeting 14 OCT 2020<br />
Mihaela Ifrim <br />
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| ZOOM: Please join! Here is the list of problems for the next meeting!!! [[File:Putnam-Problems-and-Theory-form-Oct-14th-2020-short.pdf ]] A more detailed list is posted on onedrive! <br />
|-<br />
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-<br />
|Meeting 21 OCT 2020<br />
Mihaela Ifrim <br />
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| ZOOM: Please join! We worked out some of the problem proposed on the previous meeting!!! [[File:Putnam-Problems-and-Theory-form-Oct-14th-2020-short.pdf ]] Some solutions will be posted on onedrive! Reach out to us if you would like access to the solutions and you did not register yet! <br />
|-<br />
-<br />
|Meeting 28 OCT 2020<br />
Tatyana Shcherbina <br />
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| ZOOM: Please join! The next two meeting will cover '''Polynomials'''! Please see the attached list of problems!! Enjoy!!! [[File: putnam_pol1.pdf ]] <br />
|-<br />
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|Meeting 4 Nov 2020<br />
Tatyana Shcherbina <br />
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| Here are the theory discussed on Oct 28 and hints to the problems [[File: putnam_pol1_hints.pdf ]] and [[File: polynomials_theory.pdf ]] <br />
|-<br />
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|Meeting 4 Nov 2020<br />
Tatyana Shcherbina <br />
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| Here are the solutions of Polynomials problems [[File: putnam_Oct28_sol.pdf ]] <br />
|-<br />
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|Meeting 11 Nov 2020<br />
Dima Arinkin <br />
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| On ZOOM (the link is above). The topic for the next two meetings is '''Linear algebra'''. Here are the [[Media:linear_algebra_2020.pdf | problems]] I plan to discuss, and here is a short [http://math.northwestern.edu/putnam/filom/Linear_and_Abstract_Algebra.pdf summary] (from NWU) of some common linear algebra techniques for math contests.<br />
|-<br />
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|Meeting 18 Nov 2020<br />
Dima Arinkin <br />
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| On ZOOM (the link is above). Continuing with the linear algebra: here are the [[Media:linear_algebra_2_2020.pdf | problems]] (including some left-overs from the last time). <br />
|-<br />
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|Meeting 2 Dec 2020<br />
Botong Wang <br />
<br />
| On ZOOM (the link is above). The topic for the next two meetings is '''limits of sequences''' (sections 3.1.3, 3.1.4, 3.1.5 in Putnam and Beyond). We will go over some basic theorems and discuss how to apply them. Here is the [[Media:Putnam_limits.pdf | worksheet]].<br />
|-<br />
|}<br />
[[File:WiscFall.jpg ]]<br />
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<br />
<br />
<br />
==Spring 2020==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. <br />
<br />
The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
* February 5: [[Media:Putnam_Binomial2020.pdf | Binomial coefficients and generating functions]] [[Media:Putnam_Binomial2020_answer.pdf | (Answers and hints)]] Botong <br />
* February 19: [[Media:Putnam_Number_theory2020.pdf | Number theory]] [[Media:Putnam_Number2020.pdf | (Answers and hints)]] Botong<br />
* March 4 and 11: [[Media: Inequalities.pdf | Inequalities]] ( Note comming up!) Kim<br />
<br />
==Fall 2019==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. '''The first meeting will be on the 25th of September in Van Vleck hall, room B139.'''<br />
<br />
We will continue using the [http://piazza.com/wisc/fall2018/putnam2018/ Piazza page] from last semester for discussions. The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
* September 25: [[Media:Putnam_problems_2017+2018.pdf | Introductory meeting]] Botong<br />
* October 2: [[Putnam.pdf | Integral inequalities]] Mihaela<br />
* October 9: [[Putnam.pdf | More about Integral inequalities]] (I will post notes on Wednesday morning and we will discuss more in class!) Mihaela<br />
* October 16: [[ODE.pdf | ODE of the first order]] Chanwoo<br />
* November 6: [[Media:Numbers.pdf | Number theory]] Dima<br />
* November 13: ??<br />
* November 20: [[Geometry.pdf | Geometry]] ( Note comming up!) Mihaela<br />
* November 27: [[No meeting! Thanksgiving! ]]<br />
* December 4: Last meeting of the semester! Please come and bring your friends too!! It will be fun! Mihaela<br />
<br />
<br />
<br />
<br />
==Spring 2019==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other Olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. The first meeting will be on the 6th of February in Van Vleck hall, room B139.<br />
<br />
<br />
<br />
'''! Important announcement:''' We will begin preparing you for the Putnam exam earlier this year. The material covered will be presented gradually. More details will be explained to you during your first meeting of this semester (Feb 6th). We put together a Piazza account that will help the participants to discuss and collaborate with their pairs. Here is the link you need to access in order to register for this "class": piazza.com/wisc/fall2018/putnam2018 . Our intervention on Piazza will be minimal (some of the instructors will, from time to time, visit the piazza questions and provide some help). Also, based on your requests, we have decided to structure our meetings in a way that will provide more insight on methods and certain tricks that are very often used in this type of math competitions. The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
* February 6: [[Media:Putnam_Basics_2019.pdf | The basics]] by Botong<br />
* February 13: Botong<br />
* February 20: Alex [[Media:Ordered_Sets.pdf | Ordered Sets]]<br />
* March 6th: Mihaela [[Media: Putnam.pdf | Algebra]]<br />
* March 13: Mihaela<br />
* March 27: Botong [[Media: Matrix.pdf | Matrices]]<br />
<br />
If this material is completely new to you then read through the definitions in the first section and try the interspersed exercises which are direct applications of the definitions. If you are familiar with the basic material then review the problem solving strategies and the example problems which directly utilize the techniques. Finally, if you are a veteran, go ahead and jump right to the exercises!<br />
* February 27: Alex: Review results from 2/20. Bring written solutions and/or be prepared to present your <br />
* March 6th: Mihaela<br />
* March 13: Mihaela<br />
etc.<br />
<br />
==Fall 2018==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139. '''The first meeting will be on the 26th of September in Van Vleck hall, room B139.'''<br />
<br />
'''! Important announcement:''' We put together a Piazza account that will help the participants to discuss and collaborate with their pairs. Here is the link you need to access in order to register for this "class": piazza.com/wisc/fall2018/putnam2018 . Our intervention on Piazza will be minimal (some of the instructors will, from time to time, visit the piazza questions and provide some help). Also, based on your requests, we have decided to structure our meetings in a way that will provide more insight on methods and certain tricks that are very often used in this type of math competitions. The book we will mainly use as a guide in preparing our meetings is: "Putnam and Beyond" by Razvan Gelca and Titu Andreescu. <br />
<br />
<br />
<br />
* September 26: topic [[Media:Putnam_26_sept_2018.pdf | Introductory meeting]] by Mihaela Ifrim. We covered only the first 3 problems. I encourage you to work out all the problems!<br />
<br />
* October 3: [[Media:Putnam_Oct_3_2018.pdf | Linear Algebra]] by George Craciun.<br />
<br />
* October 10: [[Media:Putnam polynomials 2018.pdf | Polynomials]] by Botong Wang.<br />
<br />
* October 17: [[Media:SeqPut18.pdf | Sequences]] by Alex Hanhart.<br />
<br />
* October 24: [[Media:Putnam_Oct_24th_2018.pdf | Convergence and Continuity]] by Mihaela Ifrim.<br />
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* October 27: Virginia Tech Math Contest: 9-11:30am in VV B115.<br />
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* October 31: [[Media:Putnam_Oct_31_2018.pdf | Geometry: cartesian coordinates, complex coordinates, circles and conics]] by George Craciun.<br />
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* November 7: [[Media:Putnam_Combinatorics_2018.pdf | Combinatorics: Set theory and geometric combinatorics]] by Botong Wang.<br />
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* November 14: [[Media:group.pdf | Techniques from Group Theory]] by Alex Hanhart.<br />
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* November 21: '''No meeting''': Happy Thanksgiving!<br />
<br />
* November 28: [[Media:Putnam_November_28_2018.pdf | Number Theory]] by Mihaela Ifrim.<br />
<br />
* December 1: Putnam Competition! Starts at 9am!!!! '''The competition will take place December 1st 2018 (Saturday December 1st). The competition is administered in two sessions (A and B) on the same day, December 1st! Session A will start at 9 am and it will end at 12pm, and Session B will start at 2pm and it will end at 5pm. You should arrive at least 10 minutes prior to each session. You should bring your own pencils and pens (blue or black ink are permitted). Number 2 pencils with erasers will be needed to complete the identification forms. Erasers are also permitted, but nothing else will not be allowed in the exam room. I plan on bringing 20 such no 2 pencils. The exam room is B239 which is a class room located in Van Vleck Hall, at the level B2. Thank you all for participating and see you all there! If you have friends that would like to take the exam please encourage them to do so.'''<br />
<br />
==Spring 2018==<br />
<br />
The Putnam Club does not meet in the spring, but we had the fourth annual UW [[Undergraduate Math Competition]] on '''April 24th''', 2018, 5:30-8pm in VV B239.<br />
<br />
==Fall 2017==<br />
<br />
The Putnam Club will help you prepare for the exam by practicing on problems from previous years and other olympiad-style problems. The meeting time is 5pm on Wednesdays in VV B139.<br />
<br />
* September 20: [[Media:Putnam092017.pdf | Introductory meeting]] by D.Arinkin<br />
* September 27: [[Media:Putnam092717.pdf | Equations with functions as unknowns]] by M.Ifrim (by request: here is [[Media:Putnam092717sol6.pdf | a solution to problem 6]]; problem 7 is problem B5 of 2016 Putnam exam; you can see the solution [http://kskedlaya.org/putnam-archive/2016s.pdf here]).<br />
* October 4: [[Media:Putnam100417.pdf | Inequalities ]] by G.Craciun.<br />
* October 11: [[Media:Putnam101117.pdf | Polynomials ]] by D.Arinkin.<br />
* October 18: [[Media:Putnam1(2)..pdf | Equations ]] by M. Ifrim<br />
* October 21: Virginia Tech Math Contest: 9-11:30am in VV B203.<br />
* October 25: Review of this year's [[Media:VTRMC2017.pdf | Virginia Tech Contest]] by G.Craciun.<br />
* November 1: [[Media:Putnam110117.pdf | Functions and calculus]] by D.Arinkin.<br />
* November 8: [[Media:Putnam1.pdf | Past Competitions]] by M.Ifrim<br />
* November 15: [[Media:Putnam111517.pdf | Recurrences]] by G.Craciun.<br />
* November 22: '''No meeting''': Happy Thanksgiving!<br />
* November 29: [[Media:Putnam112917.pdf | Complex numbers]] by D.Arinkin.<br />
* December 2: '''Putnam Exam''' in VVB115. Morning session: 9-12pm; Afternoon session: 2-5pm.<br />
<br />
==Spring 2016==<br />
<br />
The Putnam Club does not meet in the spring, but we had the third annual UW [[Undergraduate Math Competition]] on April 19th, 2017.<br />
<br />
==Fall 2016==<br />
<br />
* September 20: [[Media:Putnam092016.pdf | Introductory meeting]]<br />
* September 27: [[Media:Putnam092716.pdf | Calculus and analysis]]<br />
* October 4: [[Media:Putnam100416.pdf | Generating functions]] (by Vlad Matei) <br />
* October 11: [[Media:UWUMC2016.pdf | Review of last year's UW Math competition]]<br />
* October 18: [[Media:Putnam101816.pdf | Functional equations]]<br />
* October 22: Virginia Tech Math Contest<br />
* October 25: Review of this year's [[Media:vtrmc16.pdf | VT contest]]<br />
* November 1: [[Media:Putnam110116.pdf | Matrices]] (by Vlad Matei)<br />
* November 15: [[Media:Putnam111516.pdf | Two algebra problems]]<br />
* November 22: No meeting: Happy Thanksgiving!<br />
* November 29: [[Media:Putnam112916.pdf | Assorted problems]]<br />
* December 3: Putnam Exam: Morning session: 9am-noon, Afternoon session: 2-5pm in VV B135.<br />
<br />
==Spring 2016==<br />
<br />
The Putnam Club does not meet in the spring, but we had the second annual UW [[Undergraduate Math Competition]] on April 12th, 2016.<br />
<br />
==Fall 2015==<br />
. <br />
* September 23rd: [[Media:Putnam092315.pdf | Introductory meeting]]<br />
* September 30th: [[Media:Putnam093015.pdf | Pigeonhole principle]]<br />
* October 7th: Review of [[Media:UWUMC2015.pdf | 2015 UW math competition]]<br />
* October 14th: [[Media:Putnam101415.pdf | Matrices and determinants]]<br />
* October 21st: [[Media:Putnam102115.pdf | Virginia Tech practice]]<br />
* October 24th: Virginia Tech Regional Mathematics Contest: 9-11:30 am<br />
* October 28th: Review of the 2015 Virginia Tech contest.<br />
* November 4th: [[Media:PutnamProblemsOct12.pdf | Polynomials]]<br />
* November 11th: [[Media:PutnamProblemsNov11.pdf | Assorted problems]]<br />
* November 18th: [[Media:PutnamProblemsNov18.pdf | Assorted problems]]<br />
* No meeting on November 25th<br />
* December 2nd: TBA<br />
* December 5th: Putnam competition: Morning session: 9am-12pm, afternoon session: 2-5pm in VV B115.<br />
<br />
==Spring 2015==<br />
<br />
The Putnam Club does not meet in the spring, but we had our first UW [[Undergraduate Math Competition]]!<br />
<br />
==Fall 2014==<br />
<br />
* September 17: [[Media:Putnam091714.pdf | Introductory meeting]]<br />
* September 22: [[Media:Putnam092214.pdf | Coloring and pigeonhole principle]]<br />
* October 1st: Went through HW problems from last time<br />
* October 8th: [[Media:Putnam100814.pdf | Number theory]]<br />
* October 15th: [[Media:Putnam101514.pdf | Games]]<br />
* October 22nd: [[Media:VTRMC13.pdf | Problems from last year's Virginia Tech contest]]<br />
* October 25th: Virginia Tech Regional Mathematics Contest<br />
* October 29th: Review of this year's Virginia Tech contest<br />
* November 5th: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/06-inequalities.pdf Inequalities] and [http://www.math.cmu.edu/~lohp/docs/math/2014-295/05-functional.pdf functional equations]<br />
* November 12th: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/02-polynomials.pdf Polynomials]<br />
* November 19th: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/10-combinatorics.pdf Combinatorics]<br />
* December 3rd: [http://www.math.cmu.edu/~lohp/docs/math/2014-295/08-recursions.pdf Recursions]<br />
* December 6th: Putnam competition: Morning session: 9am-12pm, Afternoon session: 2pm-5pm in Van Vleck B119<br />
* December 10th: Review of [http://www.artofproblemsolving.com/Forum/resources/files/undergraduate_competitions/Undergraduate_Competitions-Putnam-2014-23 this year's Putnam]<br />
<br />
==Fall 2013==<br />
<br />
<br />
* September 11: [[Media:Putnam091113.pdf | Introductory Meeting]]<br />
* September 18: [[Media:Putnam091813.pdf | Assorted Problems]] (by Yihe Dong) <br />
* September 25: [[Media:Putnam092513.pdf | Combinatorics]]<br />
* October 2: [[Media:Putnam100213.pdf | Matrices and Linear Algebra]]<br />
* October 9: [[Media:Putnam100913.pdf | Number Theory]]<br />
* October 16: [[Media:Putnam101613.pdf | Functions and Calculus]]<br />
* October 23: [[Media:Putnam102313.pdf | Polynomials]]<br />
* October 26: Virginia Tech Regional Mathematics Contest<br />
* October 30: [[Media:VTRMC13.pdf | Problems from this year's Virginia Tech contest]]<br />
* November 6: [[Media:Putnam110413.pdf | Games]]<br />
* November 13: [[Media:Putnam111113.pdf | Pigeonhole Principle]]<br />
* November 20: [[Media:Putnam112013.pdf | Extreme Principle]]<br />
* November 27: No meeting (Thanksgiving)<br />
* December 4: TBA<br />
* December 7: Putnam competition Morning session: 9am-12pm, afternoon session: 2-5pm in VV B239.<br />
<br />
==Fall 2012==<br />
<br />
* September 11: Introduction [[Media:Putnam2012IntroProblems.pdf | Problems]]<br />
* September 18: Some Basic Techniques [[Media:Putnam2012Week1Problems.pdf | Problems]]<br />
* September 25: Polynomials and Algebra [[Media:Putnam2012Week2Problems.pdf | Problems]]<br />
* October 2: Number Theory [[Media:Putnam2012Week3Problems.pdf | Problems]]<br />
* October 9: Calculus [[Media:Putnam2012Week4Problems.pdf | Problems]]<br />
* October 16: Games and Algorithms [[Media:Putnam2012Week5Problems.pdf | Problems]]<br />
* October 23: Combinatorics [[Media:Putnam2012Week6Problems.pdf | Problems]]<br />
* October 30: Probability [[Media:Putnam2012Week7Problems.pdf | Problems]]<br />
* November 6: Linear Algebra [[Media:Putnam2012Week8Problems.pdf | Problems]]<br />
* November 13: Grab Bag [[Media:Putnam2012Week9Problems.pdf | Problems]]<br />
* November 27: Grab Bag 2 [[Media:Putnam2012Week10Problems.pdf | Problems]]<br />
<br />
==Fall 2011==<br />
<br />
* September 21: Pigeonhole Principle (Brian Rice) [[Media:PutnamProblemsSept21.pdf | Problems]]<br />
* September 28: Introduction to Counting (Brian Rice) [[Media:PutnamProblemsSept28.pdf | Problems]]<br />
* October 5: Elementary Number Theory (Brian Rice) [[Media:PutnamProblemsOct5.pdf | Problems]], [[Media:PutnamProblemsOct5Hard.pdf | Problems (Hardcore)]]<br />
* October 12: Polynomials (Brian Rice) [[Media:PutnamProblemsOct12.pdf | Problems]], [[Media:PutnamProblemsOct12Hard.pdf | Problems (Hardcore)]]<br />
* October 19: A Grab Bag of Discrete Math (Brian Rice) [[Media:PutnamProblemsOct19.pdf | Problems]]<br />
* October 26: Calculus, Week 1 (Brian Rice) [[Media:PutnamProblemsOct26.pdf | Problems]]<br />
* November 2: Calculus, Week 2 (Brian Rice) [[Media:PutnamProblemsNov2.pdf | Problems]]<br />
* November 9: Linear and Abstract Algebra (Brian Rice) [[Media: PutnamProblemsNov9.pdf | Problems]]<br />
* November 16: Mock Putnam [[Media: MockPutnamProblems.pdf | Problems]], [[Media: MockPutnamSolutions.pdf | Solutions]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=TechTA_page&diff=20681TechTA page2021-01-27T18:01:41Z<p>Nagreen: </p>
<hr />
<div>We have TAs who will function as Technical TAs.<br />
<br />
'''Hours'''<br />
<br />
During the Spring Semester 2021, they are<br />
<br />
*Erika Pirnes<br />
*Di Chen<br />
*Tianhong Huang<br />
<br />
Each TechTA will either have office hours, or will have more flexible times where they are responsible for answering the TechTA email (techta@math.wisc.edu).<br />
<br />
As of Spring 2021, those times are<br />
<br />
*Monday 10am-12pm: Tianhong Huang <br />
*Monday 1-230pm: Erika Pirnes<br />
*Tuesday 6:00pm-8:00pm: Di Chen<br />
*Wednesday 10am-12pm: Tianhong Huang<br />
*Thursday 6:00pm-8:00pm: Di Chen<br />
<br />
Erika will have some flex hours to monitor the email during off times.<br />
<br />
Sara Nagreen will also monitor the email when otherwise it is not monitored.<br />
<br />
'''Job Duties'''<br />
<br />
What sort of questions can a TechTA expect?<br />
<br />
* How does Zoom work?<br />
* Why doesn't my Zoom work the way I expect?<br />
* I am trying to do something in Canvas and it isn't working/I don't know how.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=TechTA_page&diff=20680TechTA page2021-01-27T18:01:15Z<p>Nagreen: </p>
<hr />
<div>We have TAs who will function as Technical TAs.<br />
<br />
[Hours]<br />
<br />
During the Spring Semester 2021, they are<br />
<br />
*Erika Pirnes<br />
*Di Chen<br />
*Tianhong Huang<br />
<br />
Each TechTA will either have office hours, or will have more flexible times where they are responsible for answering the TechTA email (techta@math.wisc.edu).<br />
<br />
As of Spring 2021, those times are<br />
<br />
*Monday 10am-12pm: Tianhong Huang <br />
*Monday 1-230pm: Erika Pirnes<br />
*Tuesday 6:00pm-8:00pm: Di Chen<br />
*Wednesday 10am-12pm: Tianhong Huang<br />
*Thursday 6:00pm-8:00pm: Di Chen<br />
<br />
Erika will have some flex hours to monitor the email during off times.<br />
<br />
Sara Nagreen will also monitor the email when otherwise it is not monitored.<br />
<br />
[Job Duties]<br />
<br />
What sort of questions can a TechTA expect?<br />
<br />
* How does Zoom work?<br />
* Why doesn't my Zoom work the way I expect?<br />
* I am trying to do something in Canvas and it isn't working/I don't know how.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=TechTA_page&diff=20679TechTA page2021-01-27T18:00:40Z<p>Nagreen: </p>
<hr />
<div>We have TAs who will function as Technical TAs.<br />
<br />
[[Hours]]<br />
<br />
During the Spring Semester 2021, they are<br />
<br />
*Erika Pirnes<br />
*Di Chen<br />
*Tianhong Huang<br />
<br />
Each TechTA will either have office hours, or will have more flexible times where they are responsible for answering the TechTA email (techta@math.wisc.edu).<br />
<br />
As of Spring 2021, those times are<br />
<br />
*Monday 10am-12pm: Tianhong Huang <br />
*Monday 1-230pm: Erika Pirnes<br />
*Tuesday 6:00pm-8:00pm: Di Chen<br />
*Wednesday 10am-12pm: Tianhong Huang<br />
*Thursday 6:00pm-8:00pm: Di Chen<br />
<br />
Erika will have some flex hours to monitor the email during off times.<br />
<br />
Sara Nagreen will also monitor the email when otherwise it is not monitored.<br />
<br />
[[Job Duties]]<br />
<br />
What sort of questions can a TechTA expect?<br />
<br />
* How does Zoom work?<br />
* Why doesn't my Zoom work the way I expect?<br />
* I am trying to do something in Canvas and it isn't working/I don't know how.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=TechTA_page&diff=20678TechTA page2021-01-27T17:27:44Z<p>Nagreen: Created page with "We have TAs who will function as Technical TAs. During the Spring Semester 2021, they are *Erika Pirnes *Di Chen *Tianhong Huang Each TechTA will either have office hours, o..."</p>
<hr />
<div>We have TAs who will function as Technical TAs.<br />
During the Spring Semester 2021, they are<br />
<br />
*Erika Pirnes<br />
*Di Chen<br />
*Tianhong Huang<br />
<br />
Each TechTA will either have office hours, or will have more flexible times where they are responsible for answering the TechTA email (techta@math.wisc.edu).<br />
<br />
As of Spring 2021, those times are<br />
<br />
*Monday 10am-12pm: Tianhong Huang <br />
*Monday 1-230pm: Erika Pirnes<br />
*Tuesday 6:00pm-8:00pm: Di Chen<br />
*Wednesday 10am-12pm: Tianhong Huang<br />
*Thursday 6:00pm-8:00pm: Di Chen<br />
<br />
Erika will have some flex hours to monitor the email during off times.<br />
<br />
Sara Nagreen will also monitor the email when otherwise it is not monitored.</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Computer_Help&diff=20677Computer Help2021-01-27T17:23:03Z<p>Nagreen: </p>
<hr />
<div>'''Computer Help'''<br />
This is a guide to the computer facilities, services and software available at the Math department of the University of Wisconsin. Most of the facilities are for department's the faculty, graduate students and staff. <br />
<br />
==COVID Computing==<br />
* [[TechTA page]]<br />
<br />
== Accounts and Policies ==<br />
* [[Math Accounts]]<br />
* [[Math Computer Policies]]<br />
* [[Quotas]]<br />
* [[University Computer Policies]]<br />
* [[Math Apps]]<br />
<br />
=== Account Set Up ===<br />
Every person in the math department should be provided the opportunity to set up an account. That account is used for ...<br />
<br />
* computer login for math department computers<br />
* the ability to print to department printers<br />
* file storage on the department file server<br />
* access to math department servers for math software<br />
* the ability to login to various department web pages<br />
<br />
This is different from your WiscMail account, which is used for <br />
<br />
* payroll<br />
* access to Canvas<br />
* access to UW system level IT resources such as Google Apps and UWNet wireless<br />
* your UW wiscmail account<br />
* login to various UW protected webpages hosted throughout the university<br />
* WiscVPN<br />
<br />
To set up your IMAP email client<br />
<br />
go to [https://kb.wisc.edu/page.php?id=28350]<br />
<br />
If you have problems with this, please let us know: staff@math.wisc.edu<br />
<br />
=== Dealing With Spam ===<br />
<br />
The University runs Office 365, which has some spam controls built in. <br />
<br />
There's two parts to the UW's spam control.<br />
<br />
* the Clutter Folder [https://kb.wisc.edu/page.php?id=53321]<br />
* the Junk Mail folder [https://kb.wisc.edu/page.php?id=45051]<br />
<br />
Questions regarding these two methods should be directed to the DoIT Help Desk. (264-HELP, 4357)<br />
<br />
=== Vacation Mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=32606]Head over to the UW KB.<br />
<br />
=== Forwarding your e-mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=36539]<br />
<br />
=== Leaving the Department ===<br />
If you leave the Math Department, we will occasionally remove old accounts. In some cases, we can leave an account in place for <br />
<br />
#) users that are continuing to collaborate with faculty or staff for research<br />
#) users that wish to continue to receive mail under their math account for a time. <br />
<br />
While we can't guarantee infinite continuation of your email account because that is controlled by DoIT, we do have some methods at our command to make this more streamlined and less prone to being deactivated.<br />
<br />
Generally, we remove accounts in October and March. In most cases, you'll be told in an email that we intend on doing this.<br />
<br />
If you feel you fall under either of the two case scenarios listed above, please email nagreen@math.wisc.edu.<br />
<br />
=== E-mail Web Forms ===<br />
<br />
You can create a web page in your server space.<br />
Here's how: [https://sites.google.com/a/wisc.edu/math-intranet/home/computing/html]<br />
<br />
== '''Facilities''' ==<br />
<br />
The facilities and equipment described below are for use by UW Math department faculty and graduate students on the UW Madison Campus and, preferably, in Van Vleck hall.<br />
<br />
* '''Mobile Computers and Projectors''' <br><br />
Instructors may borrow laptop computers and projectors for demonstrations in any Van Vleck classroom. This equipment is kept in the AMP Library in Chamberlin Hall. You may check them out for up to 4 hours using your UW ID card. The math library also has an assortment of VGA and HDMI video cables which can be used to connect a PC, Macintosh computer or iPad to a projector. One of the projectors has built in speakers and a DVD player. It also has two microphones which can be connected to it. WARNING: the laptops available for check out are somewhat old and have only basic software (MS Office, TeX) on them. It is far better to use your own computer with the Department's projectors.<br />
<br />
* '''Ceiling Mounted Projectors''' <br><br />
<br />
Classrooms B102, B107, B130, B215, B231 and B223, B239, the 901 seminar room, and the 911 Lounge each have a ceiling mounted projector. These projectors provide better displays than the mobile units. They can be used with a laptop computer. If you want to reserve one of these rooms, contact Sharon Paulson at paulson@math.wisc.edu. Keep in mind, though, that they're heavily booked and usually only available at the beginning or end of the day.<br />
<br />
The Math Department's computer staff maintain the projectors in 901 and 911. All the others are maintained by the UW Physical Plant. Please contact Derek Dombrowski about them. You will need an access code to use them and a key if you want to use the document camera or microphone with them.<br />
Here is Derek's contact information:<br />
Derek Dombrowski<br />
373A BASCOM HALL<br />
ddombrowski@fpm.wisc.edu<br />
(608) 265-9697<br />
(608) 516-5993<br />
<br />
* [[Scanners]]<br />
<br />
= Printing =<br />
<br />
Math Dept Printers<br />
{|<br />
! Location<br />
! PrinterName<br />
! Printer Type<br />
|-<br />
|3rd hall<br />
|3<br />
|Ricoh IMC6000<br />
|-<br />
|4th hall<br />
|4<br />
|Ricoh IMC6000<br />
|-<br />
|5th hall<br />
|5<br />
|Ricoh IMC6000<br />
|-<br />
|6th hall<br />
|6<br />
|Ricoh IMC6000<br />
|-<br />
|7th hall<br />
|7<br />
|Ricoh IMC6000<br />
|-<br />
|8th hall<br />
|8<br />
|Ricoh IMC6000<br />
|-<br />
|101B VV<br />
|a<br />
|HP LaserJet 600 M601<br />
|}<br />
<br />
During the summer of 2020, new Ricoh IMC 6000 printers were placed on floors 3-8. We will also switched from LPRNG to CUPS (the Common Unix Printing System) on our unix print servers. <br />
<br />
As of 2014, we stopped charging for overages in printing, but want people to consider carefully the costs of consumables and paper, and the impact on the climate from overuse of paper. Please limit your use of our copiers to fewer than 250 pages a month.<br />
<br />
== Supplies ==<br />
If the printers run out of paper, please get more paper from the Copy Center on the second floor<br />
and place it in the printers. If you are unsure how to do this, ask the computer staff for assistance. For assistance with other problems (no toner, paper jams, etc. ) see Henry Mayes in 507 (for issues with the Ricoh copiers) and Sharon Paulson in 220 (for help with the printers in B127 and 101b). <br />
<br />
See the [http://www.cups.org/ cups guide] for more detailed information on printing with cups.<br />
Click on the links below to learn how to use each function with the Ricoh copiers.<br />
<br />
== [[Ricoh Copier FAQ]] ==<br />
<br />
Only people with computer accounts in the UW Math Department will be allowed to use the Van Vleck Ricoh copiers. If you have a math account, you will receive a code to use for copying. These <br />
codes will be mailed out once a year in September after old accounts are deleted and new ones added. '''NOTE''': if you forget your copier code, login to one of<br />
the math department linux PCs and type '''whatsmypin'''.<br />
<br />
1. You copier code is only required for copying. Although the<br />
default display shows the copier login, you do not have to login<br />
in order to print or scan. Just push the buttons at the left<br />
to select the scanner or printer function.<br />
<br />
2. Your code can be used on any of the copiers on floors 3-8.<br />
Do not use the copiers on the second floor. They are reserved<br />
for the administrative staff.<br />
<br />
3. After you have finished copying, do not touch the display.<br />
Your login will time out after 60 seconds.<br />
<br />
4. Everyone with a math dept account is urged to keep their printing <br />
at fewer than 250 pages a month. The Math Department does keep a count of <br />
printing totals. You may receive a report each month on your total printing. <br />
At the end of the month, these are zeroed out.<br />
<br />
5. How to create a multi-page PDF document: Most people will want<br />
to create a multipage PDF scan of their document (instead of the <br />
default which is a single page TIFF document). To do this press the<br />
SCANNER button to the left of the display. Select SEND FILE TYPE/NAME<br />
in the left hand column of the display, then select MULTI-PAGE -> PDF<br />
<br />
== [[Ricoh Printing FAQ]] ==<br />
<br />
* [[Using the Ricoh with Linux]] (command line printing)<br />
* [[Using a Ricoh Printer on a Macintosh]]<br />
* [[Using a Ricoh Printer on a PC]]<br />
* [[Troubleshooting]]<br />
<br />
== [[Ricoh Scanner FAQ]] ==<br />
<br />
= Remote Access =<br />
<br />
[https://www.math.wisc.edu/wiki/index.php/Accessing_your_Math_department_network_space | Using ssh, sftp, and Sshfs]<br />
<br />
= TeX/LaTeX =<br />
TeX and LaTeX are supported on the Math Department computers. To learn more about<br />
Typesetting with LaTeX we recommend the following [http://www.latex-project.org/guides/books.html site]. Mediawiki has some support for LaTeX<br />
as the following example shows:<br />
<br />
<math><br />
\int_{[0, 1]^n} <br />
\left| \sum_{k = 1}^n \mathrm{e}^{2 \pi \mathrm{i} \, x_k} \right|^s \mathrm{d}\boldsymbol{x}<br />
</math><br />
<br />
= Unix =<br />
<br />
==Manipulating PDF files ==<br />
<br />
The ''pdftk'' toolkit provides several useful tools for manipulating PDF files without using<br />
Adobe Acrobat Pro. Here are some examples:<br />
<br />
1. This command will split off the first 15 pages of the file NSFProposal.pdf and save it to 'front.pdf'. Substituting 'cat 16-end' for 'cat 1-15' will save the second half of the file.<br />
<br />
pdftk NSFProposal.pdf cat 1-15 output front.pdf<br />
<br />
2. This command will merge two (or more) pdf files:<br />
<br />
pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf<br />
<br />
You can find more examples at [http://www.pdflabs.com/docs/pdftk-cli-examples/ pdftk-examples]<br />
= Troubleshooting =<br />
Answers to some common computer problems<br />
<br />
1. If you forgot the code you need to use the copiers, login to one of the department's linux PCs, open a terminal window and type 'whatsmypin'.<br />
<br />
2. 'Macintosh users'. Sometimes the internet connection on a Mac will <br />
freeze. If this happens, click on the following"<br />
System Preferences -> Network -> DCHP -> Advanced -> renew DHCP lease<br />
<br />
3. [[Moving back to Debian from Ubuntu]]</div>Nagreenhttps://wiki.math.wisc.edu/index.php?title=Computer_Help&diff=20676Computer Help2021-01-27T17:22:30Z<p>Nagreen: </p>
<hr />
<div>'''Computer Help'''<br />
This is a guide to the computer facilities, services and software available at the Math department of the University of Wisconsin. Most of the facilities are for department's the faculty, graduate students and staff. <br />
<br />
== Accounts and Policies ==<br />
* [[Math Accounts]]<br />
* [[Math Computer Policies]]<br />
* [[Quotas]]<br />
* [[University Computer Policies]]<br />
* [[Math Apps]]<br />
<br />
=== Account Set Up ===<br />
Every person in the math department should be provided the opportunity to set up an account. That account is used for ...<br />
<br />
* computer login for math department computers<br />
* the ability to print to department printers<br />
* file storage on the department file server<br />
* access to math department servers for math software<br />
* the ability to login to various department web pages<br />
<br />
This is different from your WiscMail account, which is used for <br />
<br />
* payroll<br />
* access to Canvas<br />
* access to UW system level IT resources such as Google Apps and UWNet wireless<br />
* your UW wiscmail account<br />
* login to various UW protected webpages hosted throughout the university<br />
* WiscVPN<br />
<br />
To set up your IMAP email client<br />
<br />
go to [https://kb.wisc.edu/page.php?id=28350]<br />
<br />
If you have problems with this, please let us know: staff@math.wisc.edu<br />
<br />
=== Dealing With Spam ===<br />
<br />
The University runs Office 365, which has some spam controls built in. <br />
<br />
There's two parts to the UW's spam control.<br />
<br />
* the Clutter Folder [https://kb.wisc.edu/page.php?id=53321]<br />
* the Junk Mail folder [https://kb.wisc.edu/page.php?id=45051]<br />
<br />
Questions regarding these two methods should be directed to the DoIT Help Desk. (264-HELP, 4357)<br />
<br />
=== Vacation Mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=32606]Head over to the UW KB.<br />
<br />
=== Forwarding your e-mail ===<br />
<br />
[https://kb.wisc.edu/page.php?id=36539]<br />
<br />
=== Leaving the Department ===<br />
If you leave the Math Department, we will occasionally remove old accounts. In some cases, we can leave an account in place for <br />
<br />
#) users that are continuing to collaborate with faculty or staff for research<br />
#) users that wish to continue to receive mail under their math account for a time. <br />
<br />
While we can't guarantee infinite continuation of your email account because that is controlled by DoIT, we do have some methods at our command to make this more streamlined and less prone to being deactivated.<br />
<br />
Generally, we remove accounts in October and March. In most cases, you'll be told in an email that we intend on doing this.<br />
<br />
If you feel you fall under either of the two case scenarios listed above, please email nagreen@math.wisc.edu.<br />
<br />
=== E-mail Web Forms ===<br />
<br />
You can create a web page in your server space.<br />
Here's how: [https://sites.google.com/a/wisc.edu/math-intranet/home/computing/html]<br />
<br />
== '''Facilities''' ==<br />
<br />
The facilities and equipment described below are for use by UW Math department faculty and graduate students on the UW Madison Campus and, preferably, in Van Vleck hall.<br />
<br />
* '''Mobile Computers and Projectors''' <br><br />
Instructors may borrow laptop computers and projectors for demonstrations in any Van Vleck classroom. This equipment is kept in the AMP Library in Chamberlin Hall. You may check them out for up to 4 hours using your UW ID card. The math library also has an assortment of VGA and HDMI video cables which can be used to connect a PC, Macintosh computer or iPad to a projector. One of the projectors has built in speakers and a DVD player. It also has two microphones which can be connected to it. WARNING: the laptops available for check out are somewhat old and have only basic software (MS Office, TeX) on them. It is far better to use your own computer with the Department's projectors.<br />
<br />
* '''Ceiling Mounted Projectors''' <br><br />
<br />
Classrooms B102, B107, B130, B215, B231 and B223, B239, the 901 seminar room, and the 911 Lounge each have a ceiling mounted projector. These projectors provide better displays than the mobile units. They can be used with a laptop computer. If you want to reserve one of these rooms, contact Sharon Paulson at paulson@math.wisc.edu. Keep in mind, though, that they're heavily booked and usually only available at the beginning or end of the day.<br />
<br />
The Math Department's computer staff maintain the projectors in 901 and 911. All the others are maintained by the UW Physical Plant. Please contact Derek Dombrowski about them. You will need an access code to use them and a key if you want to use the document camera or microphone with them.<br />
Here is Derek's contact information:<br />
Derek Dombrowski<br />
373A BASCOM HALL<br />
ddombrowski@fpm.wisc.edu<br />
(608) 265-9697<br />
(608) 516-5993<br />
<br />
* [[Scanners]]<br />
<br />
= Printing =<br />
<br />
Math Dept Printers<br />
{|<br />
! Location<br />
! PrinterName<br />
! Printer Type<br />
|-<br />
|3rd hall<br />
|3<br />
|Ricoh IMC6000<br />
|-<br />
|4th hall<br />
|4<br />
|Ricoh IMC6000<br />
|-<br />
|5th hall<br />
|5<br />
|Ricoh IMC6000<br />
|-<br />
|6th hall<br />
|6<br />
|Ricoh IMC6000<br />
|-<br />
|7th hall<br />
|7<br />
|Ricoh IMC6000<br />
|-<br />
|8th hall<br />
|8<br />
|Ricoh IMC6000<br />
|-<br />
|101B VV<br />
|a<br />
|HP LaserJet 600 M601<br />
|}<br />
<br />
During the summer of 2020, new Ricoh IMC 6000 printers were placed on floors 3-8. We will also switched from LPRNG to CUPS (the Common Unix Printing System) on our unix print servers. <br />
<br />
As of 2014, we stopped charging for overages in printing, but want people to consider carefully the costs of consumables and paper, and the impact on the climate from overuse of paper. Please limit your use of our copiers to fewer than 250 pages a month.<br />
<br />
== Supplies ==<br />
If the printers run out of paper, please get more paper from the Copy Center on the second floor<br />
and place it in the printers. If you are unsure how to do this, ask the computer staff for assistance. For assistance with other problems (no toner, paper jams, etc. ) see Henry Mayes in 507 (for issues with the Ricoh copiers) and Sharon Paulson in 220 (for help with the printers in B127 and 101b). <br />
<br />
See the [http://www.cups.org/ cups guide] for more detailed information on printing with cups.<br />
Click on the links below to learn how to use each function with the Ricoh copiers.<br />
<br />
== [[Ricoh Copier FAQ]] ==<br />
<br />
Only people with computer accounts in the UW Math Department will be allowed to use the Van Vleck Ricoh copiers. If you have a math account, you will receive a code to use for copying. These <br />
codes will be mailed out once a year in September after old accounts are deleted and new ones added. '''NOTE''': if you forget your copier code, login to one of<br />
the math department linux PCs and type '''whatsmypin'''.<br />
<br />
1. You copier code is only required for copying. Although the<br />
default display shows the copier login, you do not have to login<br />
in order to print or scan. Just push the buttons at the left<br />
to select the scanner or printer function.<br />
<br />
2. Your code can be used on any of the copiers on floors 3-8.<br />
Do not use the copiers on the second floor. They are reserved<br />
for the administrative staff.<br />
<br />
3. After you have finished copying, do not touch the display.<br />
Your login will time out after 60 seconds.<br />
<br />
4. Everyone with a math dept account is urged to keep their printing <br />
at fewer than 250 pages a month. The Math Department does keep a count of <br />
printing totals. You may receive a report each month on your total printing. <br />
At the end of the month, these are zeroed out.<br />
<br />
5. How to create a multi-page PDF document: Most people will want<br />
to create a multipage PDF scan of their document (instead of the <br />
default which is a single page TIFF document). To do this press the<br />
SCANNER button to the left of the display. Select SEND FILE TYPE/NAME<br />
in the left hand column of the display, then select MULTI-PAGE -> PDF<br />
<br />
== [[Ricoh Printing FAQ]] ==<br />
<br />
* [[Using the Ricoh with Linux]] (command line printing)<br />
* [[Using a Ricoh Printer on a Macintosh]]<br />
* [[Using a Ricoh Printer on a PC]]<br />
* [[Troubleshooting]]<br />
<br />
== [[Ricoh Scanner FAQ]] ==<br />
<br />
= Remote Access =<br />
<br />
[https://www.math.wisc.edu/wiki/index.php/Accessing_your_Math_department_network_space | Using ssh, sftp, and Sshfs]<br />
<br />
= TeX/LaTeX =<br />
TeX and LaTeX are supported on the Math Department computers. To learn more about<br />
Typesetting with LaTeX we recommend the following [http://www.latex-project.org/guides/books.html site]. Mediawiki has some support for LaTeX<br />
as the following example shows:<br />
<br />
<math><br />
\int_{[0, 1]^n} <br />
\left| \sum_{k = 1}^n \mathrm{e}^{2 \pi \mathrm{i} \, x_k} \right|^s \mathrm{d}\boldsymbol{x}<br />
</math><br />
<br />
= Unix =<br />
<br />
==Manipulating PDF files ==<br />
<br />
The ''pdftk'' toolkit provides several useful tools for manipulating PDF files without using<br />
Adobe Acrobat Pro. Here are some examples:<br />
<br />
1. This command will split off the first 15 pages of the file NSFProposal.pdf and save it to 'front.pdf'. Substituting 'cat 16-end' for 'cat 1-15' will save the second half of the file.<br />
<br />
pdftk NSFProposal.pdf cat 1-15 output front.pdf<br />
<br />
2. This command will merge two (or more) pdf files:<br />
<br />
pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf<br />
<br />
You can find more examples at [http://www.pdflabs.com/docs/pdftk-cli-examples/ pdftk-examples]<br />
= Troubleshooting =<br />
Answers to some common computer problems<br />
<br />
1. If you forgot the code you need to use the copiers, login to one of the department's linux PCs, open a terminal window and type 'whatsmypin'.<br />
<br />
2. 'Macintosh users'. Sometimes the internet connection on a Mac will <br />
freeze. If this happens, click on the following"<br />
System Preferences -> Network -> DCHP -> Advanced -> renew DHCP lease<br />
<br />
3. [[Moving back to Debian from Ubuntu]]</div>Nagreen