29/11/2006, 15:00 — 16:00 — Sala P3.10, Pavilhão de Matemática
Pedro del Angel, CIMAT Mexico
On the Motive of certain subvarieties of fixed Flags
There is a canonical desingularization of the Unipotent variety of , whose fibres can be identified with the variety of fixed flags under the action of the corresponding unipotent element. If this unipotent element is of type , meaning its Jordan canonical form has two blocks of sizes , then we will see that the irreducible components of the fiber have a very simple geometrical description and use this description to compute the corresponding Chow Motives.
