Word length in surface groups with characteristic generating sets

Details Word length in surface groups with characteristic generating sets Word length in surface groups with characteristic generating sets

2007-04-29

arxiv.org/abs/0704.3825v3

Proc. Amer. Math. Soc. 136 (2008), no. 7, 2631-2637

Mathematics

Group Theory

6 pages

Scientific paper

A subset of a group is characteristic if it is invariant under every automorphism of the group. We study word length in fundamental groups of closed hyperbolic surfaces with respect to characteristic generating sets consisting of a finite union of orbits of the automorphism group, and show that the translation length of any element with nonzero crossing number is positive, and bounded below by a constant depending only (and explicitly) on a bound on the crossing numbers of generating elements. This answers a question of B. Farb.

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