Arc distance equals level number
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A knot K in 1-bridge position with respect to a genus-g Heegaard surface in a 3-manifold can be moved by isotopy through knots in 1-bridge position until it lies in a union of n parallel genus-g surfaces tubed together by n-1 straight tubes, with K intersecting each tube in two arcs connecting the ends. We prove that the minimum n for which this is possible is equal to a Hempel-type distance invariant defined using an arc complex of the two holed genus-g surface
8 pages, 4 figures, to appear in Proc. Amer. Math. Soc
8 pages, 4 figures, to appear in Proc. Amer. Math. Soc