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math.GR2021
On arithmetic properties of solvable Baumslag-Solitar groups
Laurent Hayez, Tom Kaiser, Alain Valette
For , we say that a sequence of -regular graphs has property if there exists a constant such that . We i…
math.GR2020
A closer look at the non-Hopfianness of
Tom Kaiser
The Baumslag-Solitar group , is a so-called non-Hopfian group, meaning that it has an epimorphism onto itself, that is not injective. In particular this is equivalent…
math.GR2017
Combinatorial cost: a coarse setting
Tom Kaiser
The main inspiration for this paper is a paper by Elek where he introduces combinatorial cost for graph sequences. We show that having cost equal to 1 and hyperfiniteness are coars…