Lattice characterizations of $p$-soluble and $p$-supersoluble finite groups
A. -M. Liua,
S. Wangab,
V. G. Safonovc,
A. N. Skibadc a School of Mathematics and Statistics, Hainan University
b School of Mathematics, Tianjin University
c Institute of Mathematics of the National Academy of Sciences of Belarus, Minsk
d Francisk Skaryna Gomel State University, Faculty of Mathematics
Abstract:
Let
$G$ be a finite group, and let
${\mathcal L}(G)$ be the lattice of all subgroups of
$G$. A subgroup
$M$ of
$G$ is called
modular in
$G$ if
$M$ is a modular element (in the Kurosh sense) of the lattice
${ \mathcal L}(G)$, i.e., if (1) $\langle X, M \cap Z \rangle=\langle X, M \rangle \cap Z$ for all
$X \leq G, Z \leq G$ such that
$X \leq Z$, and (2) $\langle M, Y \cap Z \rangle=\langle M, Y \rangle \cap Z$ for all
$Y \leq G, Z \leq G$ such that
$M \leq Z$. If
$A$ is a subgroup of
$G$, then
$A_{m G}$ is the subgroup of
$A$ generated by all its subgroups that are modular in
$G$. We say that a subgroup
$A$ is
$N$-modular in
$G$ (
$N\leq G$) if, for some modular subgroup
$T$ of
$G$ containing
$A$,
$N$ avoids the pair $(T, A_{mG})$, i.e.
$N\cap T=N\cap A_{mG}$. Using these notions, we give new characterizations of
$p$-soluble and
$p$-supersoluble finite groups.
Keywords:
finite group, $p$-soluble group, $p$-supersoluble group, modular subgroup, $N$-modular subgroup.
UDC:
512.542
MSC: 20D10,
20D30 Received: 13.05.2024
Revised: 12.06.2024
Accepted: 17.06.2024
DOI:
10.21538/0134-4889-2024-30-4-180-187