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Seiberg-Witten-Floer Theory for Homology 3-Spheres

Bai-Ling Wang

dg-gaarXiv:dg-ga/9602003

Abstract

We give the definition of the Seiberg-Witten-Floer homology group for a homology 3-sphere. Its Euler characteristic number is a Casson-type invariant. For a four-manifold with boundary a homology sphere, a relative Seiberg-Witten invariant is defined taking values in the Seiberg-Witten-Floer homology group, these relative Seiberg-Witten invariants are applied to certain homology spheres bounding Stein surfaces.

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