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<b>UW Madison mathematics Colloquium is on Fridays at 4:00 pm. </b>
<b>UW-Madison Mathematics Colloquium is on Fridays at 4:00 pm in Van Vleck B239 unless otherwise noted.</b>


<!--- in Van Vleck B239, '''unless otherwise indicated'''. --->
Contacts for the colloquium are Dallas Albritton (fall 2025) and Paul Apisa (spring 2026). Everyone in the math department is subscribed to the mathcolloquium@g-groups.wisc.edu mailing list.


==This Semester's Colloquia==


== January 10, 2022, Monday at 4pm in B239 + [http://go.wisc.edu/wuas48 Live stream] + [https://uwmadison.zoom.us/j/93283927523?pwd=S3V6Nlh4bUhYc0F5QzNabi9RMSthUT09 Chat over Zoom], [https://www.stat.berkeley.edu/~gheissari/ Reza Gheissari] (UC Berkeley) ==
[[Colloquia/Fall2025 | Fall 2025]]


(reserved by the hiring committee)
==Future Colloquia==


'''Surface phenomena in the 2D and 3D Ising model'''
[[Colloquia/Spring2026 | Spring2026]]


Since its introduction in 1920, the Ising model has been one of the most studied models of phase transitions in statistical physics. In its low-temperature regime, the model has two thermodynamically stable phases, which, when in contact with each other, form an interface: a random curve in 2D and a random surface in 3D. In this talk, I will survey the rich phenomenology of this interface in 2D and 3D, and describe recent progress in understanding its geometry in various parameter regimes where different surface phenomena and universality classes emerge.
==Past Colloquia==


== January 17, 2022, Monday at 4pm in B239 + [http://go.wisc.edu/wuas48 Live stream] + [https://uwmadison.zoom.us/j/93283927523?pwd=S3V6Nlh4bUhYc0F5QzNabi9RMSthUT09 Chat over Zoom], [https://sites.google.com/view/lovingmath/home Marissa Loving] (Georgia Tech) ==
[[Colloquia/Spring 2025|Spring 2025]]


(reserved by the hiring committee)
[[Colloquia/Fall 2024|Fall 2024]]


'''Symmetries of surfaces: big and small'''
[[Colloquia/Spring2024|Spring 2024]]


We will introduce both finite and infinite-type surfaces and study their collections of symmetries, known as mapping class groups. The study of the mapping class group of finite-type surfaces has played a central role in low-dimensional topology stretching back a hundred years to work of Max Dehn and Jakob Nielsen, and gaining momentum and significance through the celebrated work of Bill Thurston on the geometry of 3-manifolds. In comparison, the study of the mapping class group of infinite-type surfaces has exploded only within the past few years. Nevertheless, infinite-type surfaces appear quite regularly in the wilds of mathematics with connections to dynamics, the topology of 3-manifolds, and even descriptive set theory -- there is a great deal of rich mathematics to be gained in their study! In this talk, we will discuss the way that the study of surfaces intersects and interacts with geometry, algebra, and number theory, as well as some of my own contributions to this vibrant area of study.
[[Colloquia/Fall 2023|Fall 2023]]


== January 21, 2022, Friday at 4pm in B239 + [http://go.wisc.edu/wuas48 Live stream] + [https://uwmadison.zoom.us/j/93283927523?pwd=S3V6Nlh4bUhYc0F5QzNabi9RMSthUT09 Chat over Zoom], [https://web.math.princeton.edu/~nfm2/ Nicholas Marshall] (Princeton) ==
[[Colloquia/Spring2023|Spring 2023]]


(reserved by the hiring committee)
[[Colloquia/Fall2022|Fall 2022]]


'''Laplacian quadratic forms, function regularity, graphs, and optimal transport'''
[[Spring 2022 Colloquiums|Spring 2022]]


In this talk, I will discuss two different applications of harmonic analysis to
problems motivated by data science. Both problems involve using Laplacian
quadratic forms to measure the regularity of functions. In both cases the key
idea is to understand how to modify these quadratic forms to achieve a specific
goal. First, in the graph setting, we suppose that a collection of m graphs
G_1 = (V,E_1),...,G_m=(V,E_m) on a common set of vertices V is given,
and consider the problem of finding the 'smoothest' function f : V -> R with
respect to all graphs simultaneously, where the notion of smoothness is defined
using graph Laplacian quadratic forms. Second, on the unit square [0,1]^2, we
consider the problem of efficiently computing linearizations of 2-Wasserstein
distance; here, the solution involves quadratic forms of a Witten Laplacian.
== January 24, 2022, Monday at 4pm in B239 + [http://go.wisc.edu/wuas48 Live stream] + [https://uwmadison.zoom.us/j/93283927523?pwd=S3V6Nlh4bUhYc0F5QzNabi9RMSthUT09 Chat over Zoom], [https://sites.google.com/view/skippermath Rachel Skipper] (Ohio State) ==
(reserved by the hiring committee)
'''From simple groups to symmetries of surfaces'''
We will take a tour through some families of groups of historic importance in geometric group theory, including self-similar groups and Thompson’s groups. We will discuss the rich, continually developing theory of these groups which act as symmetries of the Cantor space, and how they can be used to understand the variety of infinite simple groups. Finally, we will discuss how these groups are serving an important role in the newly developing field of big mapping class groups which are used to describe symmetries of surfaces.
== February 11, 2022, [https://people.math.wisc.edu/~msoskova/ Mariya Soskova] (UW-Madison) ==
(local)
== February 18, 2022, [https://people.math.wisc.edu/~seeger/ Andreas Seeger] (UW-Madison) ==
(local)
== February 25, 2022, [https://sites.google.com/view/rohini-ramadas/home Rohini Ramadas] (Warwick) ==
(hosted by WIMAW)
== March 2 and 4, 2022 (Wednesday and Friday),  [http://www.math.stonybrook.edu/~roblaz/ Robert Lazarsfeld] (Stony Brook) ==
('''Departmental Distinguished Lecture series''')
== March 11, 2022, [https://people.math.wisc.edu/~anderson/ David Anderson] (UW-Madison) ==
(local)
== March 25, 2022, [http://www.math.lsa.umich.edu/~canary/ Richard Canary] (Michigan) ==
(hosted by Zimmer)
== April 1, 2022, [https://www.patelp.com/ Priyam Patel] (Utah) ==
(hosted by WIMAW)
== April 8, 2022, [https://math.temple.edu/~tuf27009/index.html Matthew Stover] (Temple University) ==
(hosted by Zimmer)
== April 15, 2022, [https://www.qatar.tamu.edu/programs/science/faculty-and-staff/berhand-lamel Bernhard Lamel], (Texas A&M University at Qatar) ==
(hosted by Gong)
== April 22, 2022, [https://www.math.uni-kiel.de/analysis/de/mueller Detlef Müller] (Kiel, Germany) ==
(hosted by Seeger and Stovall)
== April 25-26-27 (Monday [VV B239], Tuesday [Chamberlin 2241], Wednesday [VV B239]) 4 pm  [https://math.mit.edu/directory/profile.php?pid=1461 Larry Guth] (MIT) ==
('''Departmental Distinguished Lecture series''')
== Past Colloquia ==
[[Colloquia/Fall2021|Fall 2021]]
[[Colloquia/Fall2021|Fall 2021]]


Latest revision as of 17:50, 14 August 2025


UW-Madison Mathematics Colloquium is on Fridays at 4:00 pm in Van Vleck B239 unless otherwise noted.

Contacts for the colloquium are Dallas Albritton (fall 2025) and Paul Apisa (spring 2026). Everyone in the math department is subscribed to the mathcolloquium@g-groups.wisc.edu mailing list.

This Semester's Colloquia

Fall 2025

Future Colloquia

Spring2026

Past Colloquia

Spring 2025

Fall 2024

Spring 2024

Fall 2023

Spring 2023

Fall 2022

Spring 2022

Fall 2021

Spring 2021

Fall 2020

Spring 2020

Fall 2019

Spring 2019

Fall 2018

Spring 2018

Fall 2017

Spring 2017

Fall 2016

Spring 2016

Fall 2015

Spring 2015

Fall 2014

Spring 2014

Fall 2013

Spring 2013

Fall 2012

WIMAW

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