The Shapes of Tight Composite Knots

Details The Shapes of Tight Composite Knots The Shapes of Tight Composite Knots

2011-10-14

arxiv.org/abs/1110.3262v1

Mathematics

Differential Geometry

Summary text file of tight knot lengths and writhing numbers stored in anc/ropelength_data.txt. All other data freely availabl

Scientific paper

We present new computations of tight shapes obtained using the constrained gradient descent code RIDGERUNNER for 544 composite knots with 12 and fewer crossings, expanding our dataset to 943 knots and links. We use the new data set to analyze two outstanding conjectures about tight knots, namely that the ropelengths of composite knots are at least 4\pi-4 less than the sums of the prime factors and that the writhes of composite knots are the sums of the writhes of the prime factors.

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