(1,1)-knots via the mapping class group of the twice punctured torus

Details (1,1)-knots via the mapping class group of the twice punctured torus (1,1)-knots via the mapping class group of the twice punctured torus

2002-05-13

arxiv.org/abs/math/0205138v3

Mathematics

Geometric Topology

18 pages, 10 figures. New version with minor changes. Accepted for publication in Advances in Geometry

Scientific paper

We develop an algebraic representation for (1,1)-knots using the mapping class group of the twice punctured torus MCG(T,2). We prove that every (1,1)-knot in a lens space L(p,q) can be represented by the composition of an element of a certain rank two free subgroup of MCG(T,2) with a standard element only depending on the ambient space. As a notable examples, we obtain a representation of this type for all torus knots and for all two-bridge knots. Moreover, we give explicit cyclic presentations for the fundamental groups of the cyclic branched coverings of torus knots of type (k,ck+2).

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