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Formal conjugacy growth and hyperbolicity

By Laura Ciobanu

Also appears in collection : GAGTA-9: geometric, asymptotic and combinatorial group theory and applications / GAGTA-9 : Théorie géométrique, asymptotique et combinatoire des groupes et applications

Rivin conjectured that the conjugacy growth series of a hyperbolic group is rational if and only if the group is virtually cyclic. In this talk I will present the proof (joint with Hermiller, Holt and Rees) that the conjugacy growth series of a virtually cyclic group is rational, and then also confirm the other direction of the conjecture, by showing that the conjugacy growth series of a non-elementary hyperbolic group is transcendental (joint with Antolín). The result for non-elementary hyperbolic groups can be used to prove a formal language version of Rivin's conjecture for any finitely generated acylindrically hyperbolic group G, namely that no set of minimal length conjugacy representatives of G can be regular.

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Citation data

  • DOI 10.24350/CIRM.V.18836803
  • Cite this video Ciobanu, Laura (17/09/2015). Formal conjugacy growth and hyperbolicity. CIRM. Audiovisual resource. DOI: 10.24350/CIRM.V.18836803
  • URL https://dx.doi.org/10.24350/CIRM.V.18836803

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