The Milnor degree of a three-manifold

Details The Milnor degree of a three-manifold The Milnor degree of a three-manifold

2009-02-10

arxiv.org/abs/0902.1731v2

Journal of Topology 3 (2010) 405-423

Mathematics

Geometric Topology

This version, to appear in Journal of Topology, includes only minor revisions, and added proof of Corollary 1.2

Scientific paper

The Milnor degree of a 3-manifold is an invariant that records the maximum simplicity, in terms of higher order linking, of any link in the 3-sphere that can be surgered to give the manifold. This invariant is investigated in the context of torsion linking forms, nilpotent quotients of the fundamental group, Massey products and quantum invariants, and the existence of 3-manifolds with any prescribed Milnor degree and first Betti number is established. Along the way, it is shown that the number M(k,r) of linearly independent Milnor invariants of degree k, distinguishing r-component links in the 3-sphere whose lower degree invariants vanish, is positive except in the classically known cases (when r = 1, and when r = 2 with k = 2, 4 or 6).

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