Equivariant cohomology and equivariant intersection theory

Details Equivariant cohomology and equivariant intersection theory Equivariant cohomology and equivariant intersection theory

1998-02-13

arxiv.org/abs/math/9802063v1

Mathematics

Algebraic Geometry

49 pages, 4 figures, latex2e, epsfig package required

Scientific paper

This text is an introduction to equivariant cohomology, a classical tool for topological transformation groups, and to equivariant intersection theory, a much more recent topic initiated by D. Edidin and W. Graham. It is based on lectures given at Montr\'eal is Summer 1997. Our main aim is to obtain explicit descriptions of cohomology or Chow rings of certain manifolds with group actions which arise in representation theory, e.g. homogeneous spaces and their compactifications. As another appplication of equivariant intersection theory, we obtain simple versions of criteria for smoothness or rational smoothness of Schubert varieties (due to Kumar, Carrell-Peterson and Arabia) whose statements and proofs become quite transparent in this framework.

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