Tuesday, October 25, 14:00

Alessio Cipriani, Introduction to perverse sheaves and examples.

Abstract:
Perverse sheaves on topologically stratified spaces were introduced by Beilinson, Bernstein and Deligne as hearts of t-structures on the constructible derived category. In this talk, I will introduce the formalism of BBD and I will explain some important features of categories of perverse sheaves. I will then present some examples, including the case of perverse sheaves on the complex projective line stratified by $\mathbb C$ and a point with respect to different perversities.