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The Shapes of Tight Composite Knots

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 4π-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.

preprint2011arXivOpen access
Jason CantarellaAl LaPointeEric Rawdon
math-phmath.MPmath.DG
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Jason CantarellaAl LaPointeEric Rawdon

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