Affordable Access

Access to the full text

Word posets, with applications to Coxeter groups

Authors
  • Samuel, Matthew J.
Type
Published Article
Publication Date
Aug 17, 2011
Submission Date
Aug 17, 2011
Identifiers
DOI: 10.4204/EPTCS.63.28
Source
arXiv
License
Yellow
External links

Abstract

We discuss the theory of certain partially ordered sets that capture the structure of commutation classes of words in monoids. As a first application, it follows readily that counting words in commutation classes is #P-complete. We then apply the partially ordered sets to Coxeter groups. Some results are a proof that enumerating the reduced words of elements of Coxeter groups is #P-complete, a recursive formula for computing the number of commutation classes of reduced words, as well as stronger bounds on the maximum number of commutation classes than were previously known. This also allows us to improve the known bounds on the number of primitive sorting networks.

Report this publication

Statistics

Seen <100 times