University of Minnesota
Mathematics

Mathematics Seminars for the week of September 29, 2003


Colloquium

Thursday, 3:30, in VinH 16

Professor Dennis Stanton
will speak on
"Roots of unity in enumeration"

Let $X$ be a finite set. Suppose that each x in X corresponds to a monomial $q^{c(x)}$. The generating function X(q) for X is the sum of all of these monomials, and is a polynomial in q. Clearly X(1)=|X|, but there are important examples in which X(-1) is the size of a specified set related to X. In this talk, I will give a generalization of this phenomena to roots of unity W, where X(w) counts the number of fixed points of a cyclic group. An equivalent representation theory reformulation is given. Examples of the phenomenon will be given for interger partitions, Coxeter groups, and finite fields. One example leads to a hypothesized Bruhat-like cell decomposition in finite fields. This is joint work with Vic Reiner, Peter Webb, and Dennis White.

Monday, 29 Sep 2003

Commutative Algebra/Algebraic Geometry: at 3:30 in VinH 301
Professor Bumsig Kim from Korean Institute for Advanced Studies will speak on "Towards mirror symmetry for non-abelian quotients"
Dynamical Systems Seminar: at 3:35 in VinH 570
Professor Jens Rademacher will speak on "Tracefiring of pulses I: Phenomena and numerics"
Topology: at 3:35 in VinH 206
Professor Jean Lannes from Ecole Polytechnique - Ordway Visitor will speak on "Sturm sequences, Maslov index and Bott periodicity - a continuation"
Real Analysis [Gene Fabes 1937--1997]: at 4:35 in VinH 311
... Will not meet this week

Tuesday, 30 Sep 2003

IMA Postdoc Seminar: at 11:15 in LinH 409
... Will not meet this week. The IMA will host a workshop this week on Statistical Methods for Gene Expression
Combinatorics Problem Session: at 11:15 in VinH 203B
... Bring your own problems, or listen to ours. Entire math community (undergrad, grad, faculty) welcome
Number Theory: at 1:25 in ME 221
Professor Guy Henniart from Universite de Paris-Sud will speak on "Local Langlands correspondence for $GL_n$ and higher L- functions"
Jr. Colloquium: at 3:35 in VinH 16
Mr. Dan Drake will speak on "Dirty children, unfaithful husbands, and numbers on your forehead" ... Because there is an overlap between a meeting for students interested in math graduate school and this colloquium, this talk has been postponed until next week.

Wednesday, 1 Oct 2003

P.D.E.: at 3:35 in VinH 206
Professor Chris Cosner from University of Miami will speak on "Title: to be announced"

Thursday, 2 Oct 2003

Student Topology: at 9:05a.m. in VinH 203B
Mr. Javier Zuniga will speak on "The nerve of fat cats"
Applied Mathematics and Numerical Analysis: at 11:15 in VinH 570
Professor Lea Popovic from IMA will speak on "A stochastic model for macroevolution"
Lie Theory: at 1:25 in ME 221
Professor Guy Henniart from Universite de Paris-Sud will speak on "Local Langlands correspondence for $GL_n$ and higher L- functions"
Differential Geometry: at 2:20 in VinH 313
Professor Heayong Shin from Chung-Ang University will speak on "Singularities of a minimizing harmonic map in low dimensions"
Colloquium: at 3:35 in VinH 16
Professor Dennis Stanton will speak on "Roots of unity in enumeration"

Friday, 3 Oct 2003

Industrial Problems Seminar: at 1:25 in VinH 570
... Will not meet this week
Probability: at 2:30 in VinH 207
Ms. Karen Ball will speak on "Factors of processes on graphs with nonamenable group actions"
Combinatorics: at 3:35 in VinH 207
Professor Julian Araoz from Univ. Politec. de Catalunya - Spain will speak on "Title: to be announced"
Automorphic Forms and L-Functions: at 3:35 in VinH 364
... Will not meet this week

Professor Jean Lannes, Ecole Polytechnique, is currently visiting the Mathematics Department for one month beginning September 15. His visit is made possible by the Ordway Endowment. During his visit, Professor Lannes's office is Vincent Hall 239; you can reach him by phone at 624- 4813.\hfill\break\vskip .2cm\noindent Professor Bumsig Kim from the Pohang University of Science and Technology will visit the department September 20- October 2, 2003. HIs visit is partially sponsored by the Visitors Program. During his visit Professor Kim's office will be Vincent Hall 331; you can reach him by phone at 625-0172.\hfill\break\vskip .2cm\noindent Professor Guy Henniart, University of Paris-Sud, will visit the School of Mathematics for one month beginning September 29. His visit is made possible through the Ordway Endowment. During his visit, Professor Henniart's office will be Vincent Hall 512; you can reach him by phone at 626-9137.


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Updated Wed Oct 1 03:00:01 CDT 2003
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