Distance between toroidal surgeries on hyperbolic knots in the 3-sphere

Details Distance between toroidal surgeries on hyperbolic knots in the 3-sphere Distance between toroidal surgeries on hyperbolic knots in the 3-sphere

2003-12-10

arxiv.org/abs/math/0312201v5

Mathematics

Geometric Topology

25 pages, 19 figures: Minor corrections were done for publication

Scientific paper

For a hyperbolic knot in the 3-sphere, at most finitely many Dehn surgeries yield non-hyperbolic 3-manifolds. As a typical case of such an exceptional surgery, a toroidal surgery is one that yields a closed 3-manifold containing an incompressible torus. The slope corresponding to a toroidal surgery, called a toroidal slope, is known to be integral or half-integral. We show that the distance between two integral toroidal slopes for a hyperbolic knot, except the figure-eight knot, is at most four. Hence any hyperbolic knot admits at most 5 toroidal surgeries.

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