Computations of the Ozsvath-Szabo knot concordance invariant

Details Computations of the Ozsvath-Szabo knot concordance invariant Computations of the Ozsvath-Szabo knot concordance invariant

2003-11-04

arxiv.org/abs/math/0311036v3

Geom. Topol. 8(2004) 735-742

Mathematics

Geometric Topology

Published by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol8/paper19.abs.html

Scientific paper

Ozsvath and Szabo have defined a knot concordance invariant tau that bounds the 4-ball genus of a knot. Here we discuss shortcuts to its computation. We include examples of Alexander polynomial one knots for which the invariant is nontrivial, including all iterated untwisted positive doubles of knots with nonnegative Thurston-Bennequin number, such as the trefoil, and explicit computations for several 10 crossing knots. We also note that a new proof of the Slice-Bennequin Inequality quickly follows from these techniques.

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