Still another approach to the braid ordering

Details Still another approach to the braid ordering Still another approach to the braid ordering

2005-06-24

arxiv.org/abs/math/0506495v1

Mathematics

Group Theory

Scientific paper

We develop a new approach to the linear ordering of the braid group $B\_n$, based on investigating its restriction to the set $\Div(\Delta\_n^d)$ of all divisors of $\Delta\_n^d$ in the monoid $B\_\infty^+$, i.e., to positive $n$-braids whose normal form has length at most $d$. In the general case, we compute several numerical parameters attached with the finite orders $(\Div(\Delta\_n^d), <)$. In the case of 3 strands, we moreover give a complete description of the increasing enumeration of $(\Div(\Delta\_3^d), <)$. We deduce a new and specially direct construction of the ordering on $B\_3$, and a new proof of the result that its restriction to $B\_3^+$ is a well-ordering of ordinal type $\omega^\omega$.

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