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Mark Kisin
Universität Munster
Equivariant Poincare polynomials and counting points in
characteristic p.
Friday 11th, April 12:05-12:55pm,
Stephen Roberts.
Let M0,n be the moduli spaceparametrising ordered
n-tuples of points on the complex sphere. I will explain joint
work with Gus Lehrer in which we compute the action of the symmetric
group Sn on the cohomology of
M0,n. The proof exploits a connection - going back
to Andre Weil - between the topology of varieties in characteristic
p, and their arithmetic in positive characteristic.
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