Many natural counting problems arise in connection with the normal form of braids-and seem to have not been much considered so far. Here we solve some of them. One of the noteworthy points is that a number of different induction schemes appear. The key technical ingredient is an analysis of the normality condition in terms of permutations and their descents, in the vein of the Solomon algebra. As was perfectly summarized by a referee, the main result asserts that the size of the automaton involved in the automatic structure of B"n associated with the normal form can be lowered from n! to p(n), the number of partitions of n.
Combinatorics of normal sequences of braids
Published 2005 in Journal of Combinatorial Theory
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- Publication year
2005
- Venue
Journal of Combinatorial Theory
- Publication date
2005-11-04
- Fields of study
Mathematics, Computer Science
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