Equivariant virtual Betti numbers
Abstract
We define a generalised Euler characteristic for arc-symmetric sets endowed with a group action. It coincides with equivariant homology for compact nonsingular sets, but is different in general. We lay emphasis on the particular case of Z/2, and give an application to the study of the singularities of Nash function germs via an analog of the motivic zeta function of Denef & Loeser.
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