On the mu-bar invariant of rational surface singularities
arXiv:0711.1850
Abstract
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.
12 pages, minor mistakes corrected