London Algebra Colloquium abstract

Bounding and unbounding Ext for algebraic groups

David Stewart (Oxford), 9th February 2012

Abstract

In 1984 Guralnick conjectured a universal bound on the dimension of 1-cohomology for finite groups with coefficients in simple modules. Today the highest known value is just 3. Recently there have been a couple of papers by Parshall and Scott providing new results in this direction. I will talk about the results in those papers and some answers to some questions raised therein.