Alexander polynomials of non-locally-flat knots

Details Alexander polynomials of non-locally-flat knots Alexander polynomials of non-locally-flat knots

2003-07-24

arxiv.org/abs/math/0307328v1

Indiana Univ. Math. J. 52 (2003), no. 6, 1479--1578

Mathematics

Geometric Topology

To appear in the Indiana University Mathematics Journal; see also http://www.math.yale.edu/~friedman/

Scientific paper

We generalize the classical study of Alexander polynomials of smooth or PL locally-flat knots to PL knots that are not necessarily locally-flat. We introduce three families of generalized Alexander polynomials and study their properties. For knots with point singularities, we obtain a classification of these polynomials that is complete except for one special low-dimensional case. This classification extends existing classifications for PL locally-flat knots. For knots with higher-dimensional singularities, we further extend the necessary conditions on the invariants. We also construct several varieties of singular knots to demonstrate realizability of certain families of polynomials as generalized Alexander polynomials. These constructions, of independent interest, generalize known knot constructions such as frame spinning and twist spinning.

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