BİLKENT ALGEBRA
TOPOLOGY SEMINAR

 

"Ghost Numbers of Group Algebras"

 

 

By

 

FATMA ALTUNBULAK AKSU

(Çankaya University)

 

 

 

Abstract: A ghost in the stable module category of a finite group G is a map between modular representations of G which induces a trivial map on Tate cohomology. The Freyd's generating hypothesis (GH) for the stable module category of G is the statement that every ghost between finitely generated modular representations of G factors through a projective module. In this talk, we discuss p-groups for which GH fails and then we introduce the ghost number of a group algebra which measures the degree of the failure of GH.

 

 

 

 

 

Date:  Monday, March  4, 2013

Time: 13.40-14.30

Place: Mathematics Seminar Room, SA-141

 

All are most cordially invited.
Tea and cookies will be served after the talk.