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The subgroup growth spectrum of virtually free groups

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Abstract

For a finitely generated group Γ denote by µ(Γ) the growth coefficient of Γ, that is, the infimum over all real numbers d such that s n (Γ) < n!d. We show that the growth coefficient of a virtually free group is always rational, and that every rational number occurs as growth coefficient of some virtually free group.

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Correspondence to Jan-Christoph Schlage-Puchta.

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Schlage-Puchta, JC. The subgroup growth spectrum of virtually free groups. Isr. J. Math. 177, 229–251 (2010). https://doi.org/10.1007/s11856-010-0044-7

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  • DOI: https://doi.org/10.1007/s11856-010-0044-7

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