On the direct indecomposability of infinite irreducible coxeter groups and the isomorphism problem of coxeter groups

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7 Citations (Scopus)

Abstract

In this article, we prove that any irreducible Coxeter group of infinite order, which is possibly of infinite rank, is directly indecomposable as an abstract group. The key ingredient of the proof is that we can determine, for an irreducible Coxeter group W , the centralizers in W of the normal subgroups of W that are generated by involu-tions. As a consequence, the problem of deciding whether two general Coxeter groups are isomorphic is reduced to the case of irreducible ones. We also describe the automorphism group of a general Coxeter group in terms of those of its irreducible components.

Original languageEnglish
Pages (from-to)2559-2595
Number of pages37
JournalCommunications in Algebra
Volume34
Issue number7
DOIs
Publication statusPublished - Jun 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Algebra and Number Theory

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