Speaker: Markus Linckelmann (City, University of London)
Title: On degree -1 operators in cohomology
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.