Universal abelian covers of rational surface singularities and multi-index filtrations

Details Universal abelian covers of rational surface singularities and multi-index filtrations Universal abelian covers of rational surface singularities and multi-index filtrations

2007-06-27

arxiv.org/abs/0706.4062v1

Mathematics

Algebraic Geometry

Scientific paper

In previous papers, there were computed the Poincare series of some (multi-index) filtrations on the ring of germs of functions on a rational surface singularity. These Poincare series were written as the integer parts of certain fractional power series, an interpretation of whom was not given. Here we show that, up to a simple change of variables, these fractional power series are specializations of the equivariant Poincare series for filtrations on the ring of germs of functions on the universal abelian cover of the surface singularity. We compute these equivariant Poincare series.

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