Presented by: 
Peter McNamara
Tue 15 Sep, 3:00 pm - 4:00 pm
Building 67, Room 442

Given a singularity in a complex algebraic variety, the theory of intersection cohomology/perverse sheaves associates to this singularity some algebraic invariants, the (local) intersection cohomology groups.

Our main focus is on singularities which arise naturally in representation theory. We will discuss how to construct examples where these intersection cohomology groups have torsion, as well as the representation-theoretic consequences this entails.