Algebra Seminar: Michel -- Quasisemisimple classes

Jean Michel (Universite Denis Diderot)

Friday 1 December, 2:30-3:30pm, Place: Carslaw 375

Title: Quasisemisimple classes

Abstract: This  is  a  report  on  joint  work  with Francois Digne. Quasisemisimple
elements  are  a  generalisation  of  semisimple  elements  to disconnected
reductive  groups (or equivalently, to algebraic automorphisms of reductive
groups).  In the setting  of reductive groups  over an algebraically closed
field,  we discuss the classification of quasisemisimple classes, including
isolated and quasi-isolated ones. The talk will start with the basic theory
of non-connected reductive groups.