Every braid admits a short sigma-definite representative

Details Every braid admits a short sigma-definite representative Every braid admits a short sigma-definite representative

2008-11-24

arxiv.org/abs/0811.3902v1

Mathematics

Group Theory

Scientific paper

A result by Dehornoy (1992) says that every nontrivial braid admits a sigma-definite word representative, defined as a braid word in which the generator sigma_i with maximal index i appears with exponents that are all positive, or all negative. This is the ground result for ordering braids. In this paper, we enhance this result and prove that every braid admits a sigma-definite word representative that, in addition, is quasi-geodesic. This establishes a longstanding conjecture. Our proof uses the dual braid monoid and a new normal form called the rotating normal form.

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