Lattices, graphs, and Conway mutation

Details Lattices, graphs, and Conway mutation Lattices, graphs, and Conway mutation

2011-03-02

arxiv.org/abs/1103.0487v1

Mathematics

Geometric Topology

26 pages, 4 figures

Scientific paper

The d-invariant of an integral, positive definite lattice L records the minimal norm of a characteristic covector in each equivalence class mod 2L. We prove that the 2-isomorphism type of a connected graph is determined by the d-invariant of its lattice of integral cuts (or flows). As an application, we prove that a reduced, alternating link diagram is determined up to mutation by the Heegaard Floer homology of the link's branched double-cover. Thus, alternating links with homeomorphic branched double-covers are mutants.

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