Gerhard Hiss informed me that you can help me in the following problem:
How find the torsion free subgroup of finite index in the Coxeter
I have several examples of Coxeter groups for which I want to find
a torsion free subgroup of finite index.The simplest is: 4 4 infinity . -- . -- . -- . -- . -- .
The Coxeter diagram ( linear) with 6 vertex and 5 edges.
The first two edges have "balanced" number 4 and the last edge has
Thank you in advance.Sincerely Yours.Andrzej Szczepanski.