Geodesic
On Finite Groups with~$\mathbb{P}_{\pi}$-Subnormal Subgroups
Matematičeskie zametki, Tome 114 (2023) no. 4, pp. 483-496.

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Let $\pi$ be a set of primes. A subgroup $H$ of a group $G$ is said to be $\mathbb{P}_{\pi}$-subnormal in $G$ if either $H=G$ or there exists a chain of subgroups beginning with $H$ and ending with $G$ such that the index of each subgroup in the chain is either a prime in $\pi$ or a $\pi'$-number. Properties of $\mathbb{P}_{\pi}$-subnormal subgroups are studied. In particular, it is proved that the class of all $\pi$-closed groups in which all Sylow subgroups are $\mathbb{P}_{\pi}$-subnormal is a hereditary saturated formation. Criteria for the $\pi$-supersolvability of a $\pi$-closed group with given systems of $\mathbb{P}_{\pi}$-subnormal subgroups are obtained.
Keywords: $\mathbb{P}_{\pi}$-subnormal subgroup, Sylow subgroup, hereditary saturated formation.
Mots-clés : ${\pi}$-solvable group, ${\pi}$-supersolvable group 
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T. I. Vasilyeva; A. G. Koranchuk. On Finite Groups with~$\mathbb{P}_{\pi}$-Subnormal Subgroups. Matematičeskie zametki, Tome 114 (2023) no. 4, pp. 483-496. http://geodesic.mathdoc.fr/item/MZM_2023_114_4_a0/

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