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 == Spring 2011 ==
 

 

 { cellpadding="8"
 
 !align="left"  date
 
 !align="left"  speaker
 
 !align="left"  title
 
 !align="left"  host(s)
 
 
 
 jan 21
 
 [http://www.math.unibonn.de/people/macri/ Emanuele Macri] (University of Bonn)
 
 ''Stability conditions and Bogomolovtype inequalities in higher dimension''
 
 Andrei Caldararu
 
 
 
 jan 28
 
 [http://math.berkeley.edu/~mroper/www/Home.html Marcus Roper] (Berkeley)
 
 ''Modeling microbial cooperation''
 
 Paul Milewski
 
 
 
 '''jan 31, 2:30pm, room 901'''
 
 [http://math.arizona.edu/~noni/ AnaMaria Castravet] (Arizona)
 
 ''Hypertrees and moduli spaces of stable rational curves''
 
 Andrei
 
 
 
 feb 4
 
 [http://www.math.columbia.edu/~yxy/ Xinyi Yuan] (Columbia University)
 
 ''Equidistribution in algebraic dynamics''
 
 Tonghai
 
 
 
 feb 11
 
 [http://www.math.uic.edu/~cschnell/ Christian Schnell] (U. Illinois at Chicago)
 
 ''On the locus of Hodge classes and its generalizations''
 
 Andrei
 
 
 
 feb 25
 
 [http://www.math.psu.edu/sarig/ Omri Sarig] (Penn State and Weizmann Institute)
 
 ''Measure rigidity for dynamical systems on (very) noncompact spaces''
 
 Shamgar
 
 
 
 mar 4
 
 [http://atoc.colorado.edu/people/weiss/ Jeff Weiss] (Colorado)
 
 ''Nonequilibrium Statistical Mechanics and Climate Variability''
 
 JeanLuc
 
 
 
 mar 11
 
 [http://www.math.yale.edu/public_html/People/Howe.html Roger Howe] (Yale)
 
 ''Hibi Rings in Invariant Theory''
 
 Shamgar
 
 
 
 '''mar 22, Tue'''
 
 [http://as.nyu.edu/object/SylvainCappell.html Sylvain Cappell] (Courant, NYU)
 
 ''Compact aspherical manifolds whose fundamental groups have center''
 
 Laurentiu
 
 
 
 mar 25
 
 [http://math.arizona.edu/~tiep/ Pham Huu Tiep] (Arizona)
 
 ''Representations of finite simple groups and applications''
 
 Martin Isaacs
 
 
 
 apr 1
 
 [http://www.wcer.wisc.edu/people/staff.php?sid=334 Amy Ellis] (Madison)
 
 ''Do algebra students need a reality check? How quantitative reasoning can support function understanding.''
 
 Steffen
 
 
 
 apr 8
 
 [http://math.berkeley.edu/~alanw/ Alan Weinstein] (Berkeley)
 
 ''Symplectic and Quantum Categories''
 
 YongGeun
 
 
 
 apr 15
 
 [http://people.sc.fsu.edu/~mgunzburger/ Max Gunzburger] (Florida State)
 
 ''A nonlocal vector calculus and finite element methods for nonlocal diffusion and mechanics''
 
 James Rossmanith
 
 
 
 '''apr 21, Thu'''
 
 [http://www.math.unc.edu/Faculty/jhawkins/ Jane Hawkins] (U. North Carolina)
 
 ''Dynamical properties and parameter space of elliptic functions''
 
 WIMAW (Diane Holcomb)
 
 
 
 apr 29
 
 [http://www.math.purdue.edu/people/bio/wlodar Jaroslaw Wlodarczyk] (Purdue)
 
 ''Algebraic Morse Theory and factorization of birational maps''
 
 Laurentiu
 
 
 
 '''may 2, Mon'''
 
 [http://www.cs.berkeley.edu/~oholtz/ Olga Holtz] (Berkeley)
 
 ''On complexity of linear problems''
 
 '''LAA Lecture''' (Shamgar)
 
 
 
 may 6
 
 [http://math.mit.edu/~aizenr/index.html Rami Aizenbud] (MIT)
 
 ''Gelfand pairs and Invariant distributions''
 
 Shamgar
 
 }
 

 

 == Abstracts ==   == Abstracts == 
Revision as of 19:00, 26 June 2011
Mathematics Colloquium
All colloquia are on Fridays at 4:00 pm in Van Vleck B239, unless otherwise indicated.
Fall 2011
date

speaker

title

host(s)

Sep 30

Alex Kontorovich (Yale)

On Zaremba's Conjecture

Shamgar

oct 19, Wed

Bernd Sturmfels (UC Berkeley)

TBA

distinguished lecturer

oct 20, Thu

Bernd Sturmfels (UC Berkeley)

TBA

distinguished lecturer

oct 21

Bernd Sturmfels (UC Berkeley)

TBA

distinguished lecturer

oct 28

Peter Constantin (University of Chicago)

TBA

distinguished lecturer

oct 31, Mon

Peter Constantin (University of Chicago)

TBA

distinguished lecturer

nov 18

Robert Dudley (University of California, Berkeley)

From Gliding Ants to Andean Hummingbirds: The Evolution of Animal Flight Performance

JeanLuc

dec 9

Xinwen Zhu (Harvard University)

TBA

Tonghai

Abstracts
Alex Kontorovich (Yale)
On Zaremba's Conjecture
It is folklore that modular multiplication is "random". This concept is useful for many applications, such as generating pseudorandom sequences, or in quasiMonte Carlo methods for multidimensional numerical integration. Zaremba's theorem quantifies the quality of this "randomness" in terms of certain Diophantine properties involving continued fractions. His 40year old conjecture predicts the ubiquity of moduli for which this Diophantine property is uniform. It is connected to Markoff and Lagrange spectra, as well as to families of "lowlying" divergent geodesics on the modular surface. We prove that a density one set satisfies Zaremba's conjecture, using recent advances such as the circle method and estimates for bilinear forms in the Affine Sieve, as well as a "congruence" analog of the renewal method in the thermodynamical formalism. This is joint work with Jean Bourgain.