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Representation Theory

Published by the American Mathematical Society since 1997, this electronic-only journal is devoted to research in representation theory and seeks to maintain a high standard for exposition as well as for mathematical content. All articles are freely available to all readers and with no publishing fees for authors.

ISSN 1088-4165

The 2020 MCQ for Representation Theory is 0.71.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.


Computation in Coxeter groups II. Constructing minimal roots
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by Bill Casselman
Represent. Theory 12 (2008), 260-293
Published electronically: August 19, 2008


In an earlier paper (Casselman, 2002) I described how a number of ideas due to Fokko du Cloux and myself could be incorporated into a reasonably efficient program to carry out multiplication in arbitrary Coxeter groups. At the end of that paper I discussed how this algorithm could be used to build the reflection table of minimal roots, which could in turn form the basis of a much more efficient multiplication algorithm. In this paper, following a suggestion of Robert Howlett, I explain how results due to Brigitte Brink can be used to construct the minimal root reflection table directly and more efficiently.
  • Brigitte Brink, ‘On root systems and automaticity of Coxeter groups’, \frenchspacing Ph.D. thesis, University of Sydney, 1994.
  • Brigitte Brink, ‘The set of dominance-minimal roots’, available as Report 94–43 from theSchool of Mathematics and Statistics at the University of Sydney:
  • Brigitte Brink, The set of dominance-minimal roots, J. Algebra 206 (1998), no. 2, 371–412. MR 1637139, DOI 10.1006/jabr.1997.7418
  • Brigitte Brink and Robert B. Howlett, A finiteness property and an automatic structure for Coxeter groups, Math. Ann. 296 (1993), no. 1, 179–190. MR 1213378, DOI 10.1007/BF01445101
  • Bill Casselman, ‘Automata to perform basic calculations in Coxeter groups’, in Representations of Groups, CMS Conference Proceedings 16, Amer. Math. Soc., Providence, RI, 1994.
  • Bill Casselman, Computation in Coxeter groups. I. Multiplication, Electron. J. Combin. 9 (2002), no. 1, Research Paper 25, 22. MR 1912807
  • Bill Casselman, ‘Java code for finding minimal roots’, at
  • Fokko du Cloux, ‘Un algorithme de forme normale pour les groupes de Coxeter’, preprint, Centre de Mathématiques à l’École Polytechnique, 1990.
  • Jacques Tits, Le problème des mots dans les groupes de Coxeter, Symposia Mathematica (INDAM, Rome, 1967/68) Academic Press, London, 1969, pp. 175–185 (French). MR 0254129
  • È. B. Vinberg, Discrete linear groups that are generated by reflections, Izv. Akad. Nauk SSSR Ser. Mat. 35 (1971), 1072–1112 (Russian). MR 0302779
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Bibliographic Information
  • Bill Casselman
  • Affiliation: Mathematics Department, University of British Columbia, Vancouver, Canada
  • MR Author ID: 46050
  • Email:
  • Received by editor(s): February 20, 2005
  • Received by editor(s) in revised form: August 20, 2006
  • Published electronically: August 19, 2008
  • © Copyright 2008 American Mathematical Society
    The copyright for this article reverts to public domain 28 years after publication.
  • Journal: Represent. Theory 12 (2008), 260-293
  • MSC (2000): Primary 20F55
  • DOI:
  • MathSciNet review: 2439007