Markus
Linckelmann, City, University of London

Title: On
degree -1 operators in cohomology

Abstract:
We describe an elementary construction principle for operators
of degree -1 on Ext-spaces of modules. We apply this to finite
group cohomology, and describe in particular the BV operator
on the Hochschild cohomology of a finite group algebra in
terms of this construction principle. We use this to calculate
the Lie algebra structure of the first Hochschild cohomology
of certain finite p-group algebras. This is joint work with
Radha Kessar and Dave Benson.