3-manifolds with planar presentations and the width of satellite knots

Details 3-manifolds with planar presentations and the width of satellite knots 3-manifolds with planar presentations and the width of satellite knots

2003-04-19

arxiv.org/abs/math/0304271v1

Mathematics

Geometric Topology

23 pages, 13 figures

Scientific paper

We consider compact 3-manifolds M having a submersion h to R in which each generic point inverse is a planar surface. The standard height function on a submanifold of the 3-sphere is a motivating example. To (M, h) we associate a connectivity graph G. For M in the 3-sphere, G is a tree if and only if there is a Fox reimbedding of M which carries horizontal circles to a complete collection of complementary meridian circles. On the other hand, if the connectivity graph of the complement of M is a tree, then there is a level-preserving reimbedding of M so that its complement is a connected sum of handlebodies. Corollary: The width of a satellite knot is no less than the width of its pattern knot. In particular, the width of K_1 # K_2 is no less than the maximum of the widths of K_1 and K_2.

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