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On $\mathcal{M}$-supplemented subgroups (2111.04825v3)

Published 8 Nov 2021 in math.GR

Abstract: Let $G$ be a finite group and $pk$ be a prime power dividing $|G|$. A subgroup $H$ of $G$ is called to be $\mathcal{M}$-supplemented in $G$ if there exists a subgroup $K$ of $G$ such that $G=HK$ and $H_iK<G$ for every maximal subgroup $H_i$ of $H$. In this paper, we complete the classification of the finite groups $G$ in which all subgroups of order $pk$ are $\mathcal{M}$-supplemented. In particular, we show that if $k\geq 2$, then $G/\mathrm{O}_{p'}(G)$ is supersolvable with a normal Sylow $p$-subgroup and a cyclic $p$-complement.

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