# An overview on low degree non-abelian cohomology

ARGOMENTI: Convegni Dottorato

SEMINARIO DOTTORATO
Wednesday 11 June 2008 at 15:00, room 1BC/45
Pietro POLESELLO (researcher, Dip. Mat.)
"An overview on low degree non-abelian cohomology"

-Abstract
In the first part of the seminar, which will be of introductory level, I will recall some basic facts about the first cohomology set $H1(X;underline G)$, for a given (not necessarily abelian) topological group G, such as the classification of principal G-bundles, the Hurwitz formula and the classification of G-coverings.
The second part of the seminar will be devoted to the generalization of some of these results to the "second non-abelian cohomology" of G.

ABOUT 20-30 MINUTES AFTER THE END OF THE TALK (HENCE AROUND 16:20-16:30) WE SHALL MEET IN THE COMMON ROOM (TORRE ARCHIMEDE, 7TH FLOOR) FOR A CLOSING PARTY OF THIS YEAR'S ACTIVITY. EVERYBODY ARE WARMLY WELCOME TO PARTICIPATE.

Rif. int. C. Marastoni, T. Vargiolu