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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…
math.GR2017★ 9 cited
The Reidemeister spectra of low dimensional crystallographic groups
Karel Dekimpe, Tom Kaiser, Sam Tertooy
In this paper we study the number of twisted conjugacy classes (the Reidemeister number) for automorphisms of crystallographic groups. We present two main algorithms for crystallog…