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Positively finitely related profinite groups

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Abstract

We define and study the class of positively finitely related (PFR) profinite groups. Positive finite relatedness is a probabilistic property of profinite groups which provides a first step to defining higher finiteness properties of profinite groups which generalize the positively finitely generated groups introduced by Avinoam Mann. We prove many asymptotic characterisations of PFR groups, for instance we show the following: a finitely presented profinite group is PFR if and only if it has at most exponential representation growth, uniformly over finite fields (in other words: the completed group algebra has polynomial maximal ideal growth). From these characterisations we deduce several structural results on PFR profinite groups.

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Authors and Affiliations

  1. Mathematisches Institut der Heinrich-Heine-Universität, Universitätsstr. 1, 40225, Düsseldorf, Germany

    Steffen Kionke & Matteo Vannacci

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  1. Steffen Kionke
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  2. Matteo Vannacci
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Correspondence to Steffen Kionke.

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Kionke, S., Vannacci, M. Positively finitely related profinite groups. Isr. J. Math. 225, 743–770 (2018). https://doi.org/10.1007/s11856-018-1676-2

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  • DOI: https://doi.org/10.1007/s11856-018-1676-2

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