The $A$-polynomial of the $(-2,3,3+2n)$ pretzel knots

Details The $A$-polynomial of the $(-2,3,3+2n)$ pretzel knots The $A$-polynomial of the $(-2,3,3+2n)$ pretzel knots

2011-01-07

arxiv.org/abs/1101.1349v4

Mathematics

Geometric Topology

8 pages, 6 figures

Scientific paper

We show that the A-polynomial $A_n$ of the 1-parameter family of pretzel knots $K_n=(-2,3,3+2n)$ satisfies a linear recursion relation of order 4 with explicit constant coefficients and initial conditions. Our proof combines results of Tamura-Yokota and the second author. As a corollary, we show that the $A$-polynomial of $K_n$ and the mirror of $K_{-n}$ are related by an explicit $\GL(2,\BZ)$ action. We leave open the question of whether or not this action lifts to the quantum level.

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