Geodesics in the braid group on three strands

Details Geodesics in the braid group on three strands Geodesics in the braid group on three strands

2003-11-10

arxiv.org/abs/math/0311153v1

In Group theory, statistics, and cryptography, Contemp. Math. 360 (2004) 133-150

Mathematics

Group Theory

18 pages, 3 figures. To be published in Proceedings of the AMS

Scientific paper

We study the geodesic growth series of the braid group on three strands, B_3 := . We show that the set of geodesics of B_3 with respect to the generating set S := {a,b,a^-1,b^-1} is a regular language, and we provide an explicit computation of the geodesic growth series with respect to this set of generators. In the process, we give a necessary and sufficient condition for a freely reduced word w in S^* to be geodesic in B_3 with respect to S. Also, we show that the translation length with respect to S of any element in B_3 is an integer.

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