MATHEMATICS
On Lockett pairs and Lockett conjecture for $\sigma$-local Fitting classes
E. D. Lantsetova P.M. Masherov Vitebsk State University
Abstract:
For each nonempty Fitting class
$\mathfrak{F}$, Lockett defined the smallest Fitting class
$\mathfrak{F}^*$ containing
$\mathfrak{F}$ such that $(G\times H)_{\mathfrak{F}^*}=G_{\mathfrak{F}^*}\times H_{\mathfrak{F}^*}$ for all groups
$G$ and
$H$ and the Fitting class
$\mathfrak{F}_*$ as the intersection of all nonempty Fitting classes
$\mathfrak{X}$ for which
$\mathfrak{X}^*=\mathfrak{F}^*$. Lockett pair of nonempty Fitting classes
$\mathfrak{F}$ and
$\mathfrak{H}$ is an ordered pair
$(\mathfrak{F},\mathfrak{H})$ such that $\mathfrak{F}\cap\mathfrak{H}_*=(\mathfrak{F}\cap\mathfrak{H})_*$. If
$\mathfrak{F}\subseteq\mathfrak{H}$ and
$\mathfrak{F}$ is a Lockett class, then
$\mathfrak{F}$ is said to satisfy Lockett conjecture in
$\mathfrak{H}$. In the present paper, in the universe
$\mathfrak{S}$ of all finite soluble groups, the methods for constructing Lockett pairs are described for the case when
$\mathfrak{F}$ is a generalized local Fitting class, and, in particular, for
$\mathfrak{F}$ confirmed Lockett conjecture.
Keywords:
$\sigma$-local Fitting class, Lockett pair, Lockett conjecture.
UDC:
512.542 Received: 03.02.2022
DOI:
10.54341/20778708_2022_2_51_76