Goussarov-Polyak-Viro combinatorial formulas for finite type invariants

Details Goussarov-Polyak-Viro combinatorial formulas for finite type invariants Goussarov-Polyak-Viro combinatorial formulas for finite type invariants

2007-11-26

arxiv.org/abs/0711.4001v1

Mathematics

Geometric Topology

Scientific paper

Goussarov, Polyak, and Viro proved that finite type invariants of knots are ``finitely multi-local'', meaning that on a knot diagram, sums of quantities, defined by local information, determine the value of the knot invariant. The result implies the existence of Gauss diagram combinatorial formulas for finite type invariants. This article presents a simplified account of the original approach. The simplifications provide an easy generalization to the cases of pure tangles and pure braids. The associated problem on group algebras is introduced and used to prove the existence of ``multi-local word formulas'' for finite type invariants of pure braids.

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