Seminario di algebra e geometria
ore
14:00
presso Seminario II
Stable cohomology is a Z-graded multiplicative cohomology theory
generalizing Tate cohomology and first defined by Pierre Vogel. It is connected
through a short exact sequence to absolute cohomology and bounded cohomology.
In this talk we investigate the structure of the bounded cohomology as a
graded bimodule using the Hopf algebra structure of the Ext algebra. We use
the information on the bimodule structure of bounded cohomology to study
the stable cohomology algebra as a trivial extension algebra.