Previous Conferences & Workshops

Jan
20
2021

Geometric and Modular Representation Theory Seminar

The linkage principle and the tilting character formula via Smith-Treumann theory
Daniel Juteau
3:00pm|Simonyi Hall 101 and Remote Access

The linkage principle says that the category of representations of a reductive group $G$ in positive characteristic decomposes into "blocks" controlled by the affine Weyl group. We will discuss the beautiful geometric proof of this result that Simon...

Jan
20
2021

Stability and Testability

Stability and Invariant Random Subgroups
Henry Bradford
11:00am|Remote Access
Determining whether or not a given finitely generated group is permutation stable is in general a difficult problem. In this talk we discuss work of Becker, Lubotzky and Thom which gives, in the case of amenable groups, a necessary and sufficient...
Jan
19
2021

SL2 Seminar

A categorical approach to representations in defining characteristic
Nate Harman
3:00pm|Remote Access

Let $G$ be an algebraic group defined over a finite field $F_q$. Through the lens of Tannakian formalism I will give a categorical description of the relationship between the representation theory of the algebraic group $G$ and the representation...