On the mu-bar invariant of rational surface singularities
classification
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invariantmu-barrationalsingularitiessurfaceballboundcorrection
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We show that for rational surface singularities with odd determinant the mu-bar invariant defined by W. Neumann is an obstruction for the link of the singularity to bound a rational homology 4-ball. We identify the mu-bar invariant with the corresponding correction term in Heegaard Floer theory.
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