University of Sydney Algebra Seminar

Jean Michel (Universite Denis Diderot)

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

Quasisemisimple classes

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.