On the direct indecomposability of infinite irreducible Coxeter groups and the Isomorphism Problem of Coxeter groups

Details On the direct indecomposability of infinite irreducible Coxeter groups and the Isomorphism Problem of Coxeter groups On the direct indecomposability of infinite irreducible Coxeter groups and the Isomorphism Problem of Coxeter groups

2005-01-18

arxiv.org/abs/math/0501276v1

Communications in Algebra, 34 (2006) No.7, pp.2559-2595

Mathematics

Group Theory

30 pages

Scientific paper

10.1080/00927870600651281

In this paper we prove, without the finite rank assumption, that any irreducible Coxeter group of infinite order is directly indecomposable as an abstract group. The key ingredient of the proof is that we can determine, for an irreducible Coxeter group, the centralizers of the normal subgroups that are generated by involutions. As a consequence, we show that the problem of deciding whether two general Coxeter groups are isomorphic, as abstract groups, is reduced to the case of irreducible Coxeter groups, without assuming the finiteness of the number of the irreducible components or their ranks. We also give a description of the automorphism group of a general Coxeter group in terms of those of its irreducible components.

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