Seminar Calendar
for events the day of Friday, November 13, 2009.

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Friday, November 13, 2009

Algebra, Geometry and Combinatorics Seminar
3:00 pm   in 445 Altgeld Hall,  Friday, November 13, 2009
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Submitted by llpku.
Christine Berkesch (Purdue University)
The rank of a hypergeometric system
Abstract: An A-hypergeometric system is a system of PDEs determined by a toric ideal and certain homogeneity parameters. The dimension of its solution space, called its rank, is constant for generic parameters. I will discuss the combinatorial nature of this rank at non-generic parameters and its ties to the local cohomology of the toric algebra with support in the maximal ideal.

Graduate Analysis Seminar
4:00 pm   in 341 Altgeld Hall,  Friday, November 13, 2009
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Submitted by wgreen4.
Chris Bonnell (Department of Mathematics, University of Illinois)
Stochastic Resonance
Abstract: Stochastic resonance is a feature of certain nonlinear dynamical systems which causes them to become more efficient in the presence of noise. This talk will focus mainly on a description of this feature, and some examples. It should be accessible to everyone.

Model Theory and Descriptive Set Theory
4:00 pm   in 345 Altgeld Hall,  Friday, November 13, 2009
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Submitted by w-henson.
Lou van den Dries (UIUC Math)
Sums and Products, XI
Abstract: This week we'll begin looking at section 3 in Udi Hrushovski's paper "Stable group theory and approximate subgroups", with a focus on understanding the statement of the main theorem (Theorem 3.4). In the arXiv, this is paper 0909.2190v2 [math.LO]