Previous Conferences & Workshops

Apr
08
2021

Quantum Groups Seminar

Representations of quantum groups at roots of 1
Jize Yu
4:00pm|Remote Access

We discuss modular representations of reductive algebraic groups and then proceed to representations of quantum groups at roots of unity

Apr
07
2021

Mathematical Conversations

For a given finite group G, which spaces can be the fixed point set of a G-action on a given compact space?
Sylvain Cappell
5:30pm|Remote Access

Which spaces can be the fixed point sets of actions of $G$ on finite cell-complexes of a given homotopy type? The general answers to such questions, for $G$ not a group of prime-power order, will be expressed, even for non-simply-connected spaces...

Apr
07
2021

Geometric and Modular Representation Theory Seminar

K-Motives and Koszul Duality in Geometric Representation Theory
Jens Eberhardt
3:00pm|Simonyi Hall 101 and Remote Access

Perverse sheaves and intersection cohomology are central objects in geometric representation theory. This talk is about their long-lost K-theoretic cousins, called K-motives. We will discuss definitions and basic properties of K-motives and explore...

Apr
07
2021

Stability and Testability

Approximations of infinite groups
Goulnara Arzhantseva
11:00am|Remote Access

We discuss various (still open) questions on approximations of finitely generated groups, focusing on finite-dimensional approximations such as residual finiteness and soficity. We survey our results on the existence, stability and quantification of...

Apr
06
2021

Computer Science/Discrete Mathematics Seminar II

How difficult is it to certify that a random 3SAT formula is unsatisfiable?
Toniann Pitassi
10:30am|Remote Access - see Zoom link below

The Satisfiability problem is perhaps the most famous problem in theoretical computer science, and significant effort has been devoted to understanding randomly generated SAT instances. The random k-SAT model (where a random k-CNF formula is chosen...

Apr
05
2021

Analysis Seminar

Yang-Mills Instantons, Quivers and Bows
Sergey Cherkis
4:30pm|Simonyi Hall 101 and Remote Access

The study of hyperkaehler manifolds of lowest dimension (and of gauge theory on them) leads to a chain of generalizations of the notion of a quiver: quivers, bows, slings, and monowalls. This talk focuses on bows, their representations, and...

Apr
05
2021

Members' Colloquium

The Earth's Dynamo: a Mathematical Model
Susan Friedlander
2:00pm|Simonyi Hall 101 and Remote Access

Earlier this semester we heard a fascinating talk by James Stone describing how the equations of compressible magnetohydrodynamics (MHD) can help us understand the Cosmos. Today we will return to Earth and describe a mathematical model, derived from...