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Some power of an element in a Garside group is conjugate to a periodically geodesic element

Research paper by Eon-Kyung Lee, Sang-Jin Lee

Indexed on: 18 Jun '09Published on: 18 Jun '09Published in: Mathematics - General Topology



Abstract

We show that for each element $g$ of a Garside group, there exists a positive integer $m$ such that $g^m$ is conjugate to a periodically geodesic element $h$, an element with $|h^n|_\D=|n|\cdot|h|_\D$ for all integers $n$, where $|g|_\D$ denotes the shortest word length of $g$ with respect to the set $\D$ of simple elements. We also show that there is a finite-time algorithm that computes, given an element of a Garside group, its stable super summit set.