Deligne on cohomology of algebraic varieties
Posted by Andreas Holmstrom on August 12, 2009
A week ago, Deligne gave a talk at the Newton Institute on cohomology of algebraic varieties, and this is now available to watch here in a number of formats. The talk is a very nice and accessible introduction to the classical cohomology theories in algebraic geometry, and gives some hint of the rich arithmetic structures they carry, such as Galois actions and Hodge structures. He also touches at things like periods and derived categories, while all the time staying at a fairly elementary level.