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The Witten genus and equivariant elliptic cohomology

Matthew Ando, Maria Basterra

math.ATarXiv:math/0008192

Abstract

We construct a Thom class in complex equivariant elliptic cohomology extending the equivariant Witten genus. This gives a new proof of the rigidity of the Witten genus, which exhibits a close relationship to recent work on non-equivariant orientations of elliptic spectra.

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