Mathematics – Geometric Topology
Scientific paper
1998-05-20
Mathematics
Geometric Topology
21 pages, plain tex, 4 eps figures
Scientific paper
We show that two knots have matching Vassiliev invariants of order less than n if and only if they are equivalent modulo the nth group of the lower central series of some pure braid group, thus characterizing Vassiliev's knot invariants in terms of the structure of the braid groups. We also prove some results about knots modulo the nth derived subgroups of the pure braid groups, and about knots modulo braid subgroups in general.
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