Intersection Alexander polynomials

Details Intersection Alexander polynomials Intersection Alexander polynomials

2003-07-10

arxiv.org/abs/math/0307153v1

Topology 43 (2004), no. 1, 71--117

Mathematics

Geometric Topology

To appear in Topology; see also http://math.yale.edu/~friedman

Scientific paper

By considering a (not necessarily locally-flat) PL knot as the singular locus of a PL stratified pseudomanifold, we can use intersection homology theory to define intersection Alexander polynomials, a generalization of the classical Alexander polynomial invariants for smooth or PL locally-flat knots. We show that the intersection Alexander polynomials satisfy certain duality and normalization conditions analogous to those of ordinary Alexander polynomials, and we explore the relationships between the intersection Alexander polynomials and certain generalizations of the classical Alexander polynomials that are defined for non-locally-flat knots. We also investigate the relations between the intersection Alexander polynomials of a knot and the intersection and classical Alexander polynomials of the link knots around the singular strata. To facilitate some of these investigations, we introduce spectral sequences for the computation of the intersection homology of certain stratified bundles.

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