Topology & Geometric Group Theory Seminar

Fall 2007

1:30 - 2:30, Malott 253

Tuesday, October 23

Reyer Sjamaar, Cornell University

Divided difference operators in equivariant cohomology

Divided difference operators were invented by Newton for the purpose of numerical interpolation. More recently, they showed up in work of Demazure and Bernstein-Gelfand-Gelfand on the invariant theory of compact Lie groups and the cohomology of flag varieties. In this talk, which describes joint work with Tara Holm, I will show that they act naturally as bivariant operations on equivariant cohomology. The talk will include a brief introduction to Borel's equivariant cohomology theory.

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