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Problemy Fiziki, Matematiki i Tekhniki (Problems of Physics, Mathematics and Technics), 2019, Issue 3(40), Pages 107–110
(Mi pfmt665)
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MATHEMATICS
Finite groups with given local sections
B. Hua, J. Huanga, A. N. Skibab a Jiangsu Normal University, Xuzhou
b F. Scorina Gomel State University
Abstract:
A group is called primary if it is a finite $p$-group for some prime $p$. If $\sigma=\{\sigma_i\mid i\in I\}$ is some partition of $\mathbb{P}$, that is, $P=\bigcup_{i\in I}\sigma_i$ and $\sigma_i\cap\sigma_j=\varnothing$ for all $i\ne j$, then we say that a finite group $G$ is: $\sigma$-primary if it is a $\sigma_i$-group for some $i$;
$\sigma$-nilpotent if $G=G_1\times\dots\times G_n$ for some $\sigma$-primary groups $G_1,\dots,G_n$. If $N=N_G(A)$ for some primary non-identity subgroup $A$ of $G$, then we say that $N/A_G$ is a local section of $G$. In this paper, we study a finite group $G$ under hypothesis that all proper local sections of $G$ belong to a saturated hereditary formation $\mathfrak{F}$, and we determine the normal structure of $G$ in the case when all local sections of $G$ are $\sigma$-nilpotent.
Keywords:
finite group, hereditary saturated formation, $\mathfrak{F}$-hypercentre, local section, $\sigma$-nilpotent group.
Received: 11.04.2019
Citation:
B. Hu, J. Huang, A. N. Skiba, “Finite groups with given local sections”, PFMT, 2019, no. 3(40), 107–110
Linking options:
https://www.mathnet.ru/eng/pfmt665 https://www.mathnet.ru/eng/pfmt/y2019/i3/p107
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