Bridge number, Heegaard genus and non-integral Dehn surgery

Details Bridge number, Heegaard genus and non-integral Dehn surgery Bridge number, Heegaard genus and non-integral Dehn surgery

2012-02-01

arxiv.org/abs/1202.0263v1

Mathematics

Geometric Topology

76 page, 48 figures

Scientific paper

We show there exists a linear function w: N->N with the following property. Let K be a hyperbolic knot in a hyperbolic 3-manifold M admitting a non-longitudinal S^3 surgery. If K is put into thin position with respect to a strongly irreducible, genus g Heegaard splitting of M then K intersects a thick level at most 2w(g) times. Typically, this shows that the bridge number of K with respect to this Heegaard splitting is at most w(g), and the tunnel number of K is at most w(g) + g-1.

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