Algebra Seminar: Konstantin Jakob -- A Deligne-Simpson problem for irregular G-connections over P^1

Konstantin Jakob (TU Darmstadt) is speaking in the Algebra Seminar this week.  We will
go out for lunch after the talk.  

When: Friday, 10 November, 12-1pm 

Where: Carslaw 173 

Title: A Deligne-Simpson problem for irregular G-connections over P^1 

Abstract: The Deligne-Simpson problem asks for a criterion for the existence of a
connection on a punctured P^1 with prescribed singularities.  I will explain joint work
with Zhiwei Yun on a generalization of this problem for G-connections on P^1 with two
singularities, only one of which is a regular singularity, where G is any complex
reductive group.  We give a geometric and a representation-theoretic existence
criterion, and use them to solve the Deligne-Simpson problem in many cases.