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Curvature, Connected Sums, and Seiberg-Witten Theory

Masashi Ishida, Claude LeBrun

math.DGarXiv:math/0111228

Abstract

We consider several differential-topological invariants of compact 4-manifolds which directly arise from Riemannian variational problems. Using recent results of Bauer and Furuta, we compute these invariants in many cases that were previously intractable. In particular, we are now able to calculate the Yamabe invariant for certain connected sums of complex surfaces.

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