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Finite groups with supersoluble subgroups of given orders
V. S. Monakhova,
V. N. Tyutyanovb a Gomel State University named after Francisk Skorina
b Gomel Branch of International University "MITSO"
Abstract:
We study a finite group
$G$ with the following property: for any of its maximal subgroups
$H$, there exists a subgroup
$H_1$ such that
$|H_1|=|H|$ and
$H_1\in \frak F$, where
$\frak F$ is the formation of all nilpotent groups or all supersoluble groups. We prove that, if
$\frak F=\frak N$ is the formation of all nilpotent groups and
$G$ is nonnilpotent, then
$|\pi (G)|=2$ and
$G$ has a normal Sylow subgroup. For the formation
$\frak F=\frak U$ of all supersoluble groups and a soluble group
$G$ with the above property, we prove that
$G$ is supersoluble, or
$2\le |\pi (G)|\le 3$; if
$|\pi (G)|=3$, then
$G$ has a Sylow tower of supersoluble type; if
$|\pi (G)|=2$, then either
$G$ has a normal Sylow subgroup or, for the largest
$p\in \pi (G)$, some maximal subgroup of a Sylow
$p$-subgroup is normal in
$G$. If
$G$ is nonsoluble and, for each maximal subgroup of
$G$, there exists a supersoluble subgroup of the same order, then every nonabelian composition factor of
$G$ is isomorphic to
$PSL_2(p)$ for some prime
$p$; we list all such values of
$p$.
Keywords:
finite group, soluble group, maximal subgroup, nilpotent subgroup, supersoluble subgroup.
UDC:
512.542
MSC: 20D10,
20D20,
20E28 Received: 15.04.2019
Revised: 27.06.2019
Accepted: 08.07.2019
DOI:
10.21538/0134-4889-2019-25-4-155-163