Triangles of Baumslag-Solitar Groups

Details Triangles of Baumslag-Solitar Groups Triangles of Baumslag-Solitar Groups

2008-08-06

arxiv.org/abs/0808.0934v2

Mathematics

Group Theory

Filled gap in proof of non-coprime case of Theorem 1

Scientific paper

Our main result is that many triangles of Baumslag-Solitar groups collapse to finite groups, generalizing a famous example of Hirsch. A triangle of Baumslag-Solitar groups means a group with three generators, cyclically ordered, with each generator conjugating some power of the previous one to another power. There are six parameters, occurring in pairs, and we show that the triangle fails to be developable whenever one of the parameters divides its partner, except for a few special cases. Furthermore, under fairly general conditions, the group turns out to be finite and solvable of class<4. We obtain a lot of information about finite quotients, even when we cannot determine developability.

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