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Algebraic Geometry Seminar
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University of Sydney

School of Mathematics and Statistics

Algebraic Geometry Seminar

1.05pm - 2.30pm in Carslaw 709 on Thursday 2 August 2001
with a short break around 1.50

Anthony Henderson

A Personal Introduction to Perverse Sheaves
Part 1

The theory of perverse sheaves arose from intersection cohomology, and took flight on the wings of pure structures in characteristic p and D-modules in characteristic 0. In these two talks I will attempt to bring it back to earth with a volley of examples, mostly aimed at the characteristic p side. Part 1 will introduce characteristic functions as a helpful tool for understanding perverse sheaves, and as a means of applying them to finite groups of Lie type.