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Journal of the Belarusian State University. Mathematics and Informatics, 2021, Volume 3, Pages 25–33
DOI: https://doi.org/10.33581/2520-6508-2021-3-25-33
(Mi bgumi12)
 

Mathematical logic, Algebra and Number Theory

Finite groups with given systems of generalised $\sigma$-permutable subgroups

V. S. Zakrevskaya

Francisk Skorina Gomel State University, 104 Savieckaja Street, Homieĺ 246019, Belarus
References:
Abstract: Let $\sigma = {\sigma_i | i \in I}$ – be a partition of the set of all primes $\mathbb{P}$ and $G$ – be a finite group. A set $\mathbb{P}$ of subgroups of $G$ is said to be a complete Hall $\sigma$-set of $G$ if every member $\ne 1$ of $\mathcal{H}$ is a Hall $\sigma_i$-subgroup of $G$ for some $i \in I$ and $\mathcal{H}$ contains exactly one Hall $\sigma_i$-subgroup of $G$ for every $i$ such that $\sigma_i\cap\pi(G)\ne\oslash$. A group is said to be $\sigma$-primary if it is a finite $\sigma_i$-group for some $i$. A subgroup $A$ of $G$ is said to be: $\sigma$-permutable in $G$, if $G$ possesses a complete Hall $\sigma$-set $\mathcal{H}$ such that $AH^x = H^xA$ for all $H \in \mathcal{H}$ and all $x \in G$; $\sigma$-subnormal in $G$, if there is a subgroup chain $A = A_0 \leq A_1\leq\ldots\leq A_t = G$ such that either $A_{i-1} \trianglelefteq A_i$, or $A_i/( A_i - 1)_{A_i}$ is $\sigma$-primary for all $i = 1,\ldots, t$; $\mathfrak{U}$-normal in $G$ if every chief factor of $G$ between $A_G$ and $A^G$ is cyclic. We say that a subgroup $H$ of $G$ is: (i) partially $\sigma$-permutable in $G$ if there are $\mathfrak{U}$-normal subgroup $A$ and a $\sigma$-permutable subgroup $B$ of $G$ such that $H = < A, B >$; (ii) $(\mathfrak{U}, \sigma)$-embedded in Gif there are a partially $\sigma$-permutable subgroup $S$ and a $\sigma$-subnormal subgroup $T$ of $G$ such that $G = HT$ and $H \cap T \leq S \leq H$. We study $G$ assuming that some subgroups of $G$ are partially $\sigma$-permutable or $(\mathfrak{U}, \sigma)$-embedded in $G$. Some known results are generalised.
Keywords: finite group; $\sigma$-soluble groups; $\sigma$-nilpotent group; partially $\sigma$-permutable subgroup; $(\mathfrak{U}, \sigma)$-embedded sub-group; $\mathfrak{U}$-normal subgroup.
Document Type: Article
UDC: 512.542
Language: English
Citation: V. S. Zakrevskaya, “Finite groups with given systems of generalised $\sigma$-permutable subgroups”, Journal of the Belarusian State University. Mathematics and Informatics, 3 (2021), 25–33
Citation in format AMSBIB
\Bibitem{Zak21}
\by V.~S.~Zakrevskaya
\paper Finite groups with given systems of generalised $\sigma$-permutable subgroups
\jour Journal of the Belarusian State University. Mathematics and Informatics
\yr 2021
\vol 3
\pages 25--33
\mathnet{http://mi.mathnet.ru/bgumi12}
\crossref{https://doi.org/10.33581/2520-6508-2021-3-25-33}
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