Upper bounds in the Ohtsuki-Riley-Sakuma partial order on 2-bridge knots

Details Upper bounds in the Ohtsuki-Riley-Sakuma partial order on 2-bridge knots Upper bounds in the Ohtsuki-Riley-Sakuma partial order on 2-bridge knots

2010-07-19

arxiv.org/abs/1007.3278v2

Mathematics

Geometric Topology

21 pages, 2 figures. This is a significant revision of the paper "Two-bridge knots with common ORS covers," including a proof

Scientific paper

In this paper we use continued fractions to study a partial order on the set of 2-bridge knots derived from the work of Ohtsuki, Riley, and Sakuma. We establish necessary and sufficient conditions for any set of 2-bridge knots to have an upper bound with respect to the partial order. Moreover, given any 2-bridge knot K we characterize all other 2-bridge knots J such that {K, J} has an upper bound. As an application we answer a question of Suzuki, showing that there is no upper bound for the set consisting of the trefoil and figure-eight knots.

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