Limits of Baumslag-Solitar groups

Abstract

We give a parametrization by $m$-adic integers of the limits of Baumslag-Solitar groups (marked with a canonical set of generators). It is shown to be continuous and injective on the invertible $m$-adic integers. We show that all such limits are extensions of a free group by a lamplighter group and all but possibly one are not finitely presented. Finally, we give presentations related to natural actions on trees.

24 pages; essentially equivalent to the version submitted to the editors after acceptance for publication; numerotation of statements is now coherent with the published version

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