On non-abelian dp-minimal groups I: the torsion-free and distal cases

Atticus Stonestrom

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arXiv · 2308.04209

On non-abelian dp-minimal groups I: the torsion-free and distal cases

Atticus Stonestrom

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Abstract

We give some results on dp-minimal groups. First we show that any torsion-free dp-minimal group is abelian; along the way show that any dp-minimal group admitting a principal f-generic type whose realizations are non-torsion is nilpotent-by-finite of class at most $2$. We then investigate the question of whether *every* dp-minimal group $G$ is nilpotent-by-finite. There are naturally two cases: either (1) $G$ admits a distal f-generic type or (2) $G$ admits a generically stable f-generic type. In this paper we resolve case (1). This follows from a more general structural analysis, in which, assuming that $G$ admits a distal f-generic type, we show that the quotient of $G$ by its FC-center can be naturally equipped with the structure of a valued group; we then use this valuation structure to show that indeed $G$ is nilpotent-by-finite. Case (2) of the question will be resolved in an upcoming joint paper with Eran Alouf and Frank Wagner.

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Atticus Stonestrom. 2023-08-08. On non-abelian dp-minimal groups I: the torsion-free and distal cases. https://arxiv.org/abs/2308.04209

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