Strong conciseness of Engel words in profinite groups

Khukhro, Evgeny and Shumyatsky, Pavel (2022) Strong conciseness of Engel words in profinite groups. Mathematische Nachrichten . ISSN 0025-584X

Full content URL: https://doi.org/10.48550/arXiv.2108.11789

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Strong conciseness of Engel words in profinite groups
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Abstract

A group word $w$ is said to be strongly concise in a class $\mathscr C$ of profinite groups if, for any group $G$ in $\mathscr C$, either $w$ takes at least continuum many values in $G$ or the verbal subgroup $w(G)$ is finite. It is conjectured that all words are strongly concise in the class of all profinite groups. Earlier Detomi, Klopsch, and Shumyatsky proved this conjecture for multilinear commutator words, as well as for some other particular words. They also proved that every group word is strongly concise in the class of nilpotent profinite groups, as well as that 2-Engel words are strongly concise (but their approach does not seem to generalise to $n$-Engel words for $n>2$). In the present paper we prove that for any $n$ the $n$-Engel word $[...[x,y],y],\dots y]$ (where $y$ is repeated $n$ times) is strongly concise in the class of finitely generated profinite groups.

Keywords:profinite group, pro-$p$ group, finite group, Lie ring method, Engel word, strongly concise word
Subjects:G Mathematical and Computer Sciences > G110 Pure Mathematics
Divisions:College of Science > School of Mathematics and Physics
ID Code:47417
Deposited On:08 Feb 2022 16:24

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