Department of

Mathematics


Seminar Calendar
for events the day of Friday, September 9, 2016.

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Questions regarding events or the calendar should be directed to Tori Corkery.
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Friday, September 9, 2016

4:00 pm in 241 Altgeld Hall,Friday, September 9, 2016

Smooth Motivating stacks as models for singular spaces

Joel Villatoro (UIUC Math)

Abstract: In this talk, I will try to explain why someone studying smooth geometry should be interested in stacks. I will try to give a few simple examples and provide a motivated definition of a stack. Time permitting, I will explain how stacks relate to the more specialized settings of Poisson and Riemannian geometry.

4:00 pm in 345 Altgeld Hall,Friday, September 9, 2016

Kreisler measures

Travis Nell (UIUC Math)

4:00 pm in 243 Altgeld Hall,Friday, September 9, 2016

Prism tableaux for alternating sign matrix varieties

Anna Weigandt   [email] (UIUC Math)

Abstract: A. Lascoux and M. P. Schützenberger showed that the lattice of $n\times n$ alternating sign matrices is closely related to the Bruhat order on the symmetric group; ${\tt ASM}(n)$ is the MacNeille completion of $S_n$. To $A\in {\tt ASM}(n)$ we associate $X_A$, a subvariety of the space of $n\times n$ matrices. When $A=w$ is a permutation matrix, $X_w$ is a matrix Schubert variety. In this case, A. Knutson and E. Miller showed the multidegree of $X_w$ is the Schubert polynomial $\mathfrak S_w$. We give a formula for the multidegree of an alternating sign matrix variety as a generating series over prism tableaux, extending joint work with A. Yong.