Andras I. Stipsicz
Published 2007-11-12, updated 2008-05-20Version 2
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.
Comments: 12 pages, minor mistakes corrected
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