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arxiv: 1902.08612 · v1 · pith:6TSQHCC3new · submitted 2019-02-21 · 🧮 math.GR

Engel-like conditions in fixed points of automorphisms of profinite groups

classification 🧮 math.GR
keywords groupsomeautomorphismselementengelgroupslocallynilpotent
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Let $q$ be a prime and $A$ an elementary abelian $q$-group acting as a coprime group of automorphisms on a profinite group $G$. We show that if $A$ is of order $q^2$ and some power of each element in $C_G(a)$ is Engel in $G$ for any $a\in A^{\#}$, then $G$ is locally virtually nilpotent. Assuming that $A$ is of order $q^3$ we prove that if some power of each element in $C_G(a)$ is Engel in $C_G(a)$ for any $a\in A^{\#}$, then $G$ is locally virtually nilpotent. Some analogues consequences of quantitative nature for finite groups are also obtained.

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