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- W2766794745 abstract "We analyze the rank gradient of finitely generated groups with respect to sequences of subgroups of finite index that do not necessarily form a chain, by connecting it to the cost of p.m.p. actions. We generalize several results that were only known for chains before. The connection is made by the notion of local-global convergence. In particular, we show that for a finitely generated group $Gamma$ with fixed price $c$, every Farber sequence has rank gradient $c-1$. By adapting Lackenby's trichotomy theorem to this setting, we also show that in a finitely presented amenable group, every sequence of subgroups with index tending to infinity has vanishing rank gradient." @default.
- W2766794745 created "2017-11-10" @default.
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- W2766794745 date "2017-10-28" @default.
- W2766794745 modified "2023-09-27" @default.
- W2766794745 title "Uniform rank gradient, cost and local-global convergence" @default.
- W2766794745 hasPublicationYear "2017" @default.
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