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Formality of equivariant intersection cohomology of algebraic varieties. (English) Zbl 1023.14005
In this article, the author proves that the equivariant intersection cohomology of a complete algebraic variety endowed with an action of a connected algebraic group \(G\) is a free module over the cohomology ring \(H^{*}(BG)\). The result is first proven for projective varieties, and then it is shown that for a general complete variety, one can reduce to this special case.

MSC:
14F43 Other algebro-geometric (co)homologies (e.g., intersection, equivariant, Lawson, Deligne (co)homologies)
55N91 Equivariant homology and cohomology in algebraic topology
55N33 Intersection homology and cohomology in algebraic topology
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