Annular and boundary reducing Dehn fillings

Details Annular and boundary reducing Dehn fillings Annular and boundary reducing Dehn fillings

1998-10-20

arxiv.org/abs/math/9810126v1

Mathematics

Geometric Topology

23 pages, 7 figures

Scientific paper

A manifold M is simple if it contains no essential disk, sphere, annulus or torus. If M is simple and two Dehn fillings M(r_1), M(r_2) are nonsimple, then there is an upper bound on \Delta(r_1,r_2), the geometric intersection number between r_1 and r_2. There are 10 possibilities, depending on the types of M(r_i). In this paper it will be shown that if M(r_1) contains an essential disk and M(r_2) contains an essential annulus, then \Delta(r_1,r_2) is at most two. This completes the determination of the best possible upper bounds on \Delta(r_1, r_2) for all ten cases.

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