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Satellites and products of $\omega\sigma$-fibered Fitting classes
O. V. Kamozina Bryansk State University of Engineering and Technology
Abstract:
A Fitting class $\frak F=\omega\sigma R(f,\varphi)=(G: O^\omega (G)\in f(\omega')$ and $G^{\varphi(\omega\cap\sigma_i)}\in f(\omega\cap\sigma_i)$ for all
$\omega\cap\sigma_i\in\omega\sigma (G))$ is called an
$\omega\sigma$-fibered Fitting class with
$\omega\sigma$-satellite
$f$ and
$\omega\sigma$-direction
$\varphi$. By
$\varphi_0$ and
$\varphi_1$ we denote the directions of an
$\omega\sigma$-complete and an
$\omega\sigma$-local Fitting class, respectively. Theorem 1 describes a minimal
$\omega\sigma$-satellite of an
$\omega\sigma$-fibered Fitting class with
$\omega\sigma$-direction
$\varphi$, where
$\varphi_0\le\varphi$. Theorem 2 states that the Fitting product of two
$\omega\sigma$-fibered Fitting classes is an
$\omega\sigma$-fibered Fitting class for
$\omega\sigma$-directions
$\varphi$ such that
$\varphi_0\le\varphi\le\varphi_1$. Results for
$\omega\sigma$-complete and
$\omega\sigma$-local Fitting classes are obtained as corollaries of the theorems. Theorem 3 describes a maximal internal
$\omega\sigma$-satellite of an
$\omega\sigma$-complete Fitting class. An
$\omega\sigma\mathcal L$-satellite is defined as an
$\omega\sigma$-satellite
$f$ such that
$f(\omega\cap\sigma_i)$ is the Lockett class for all
$\omega\cap\sigma_i \in\omega\sigma$. Theorem 4 describes the maximal internal
$\omega\sigma\mathcal L$-satellite of an
$\omega\sigma$-local Fitting class. Questions of the study of lattices and further study of products and critical
$\omega\sigma$-fibered Fitting classes are posed in the conclusion.
Keywords:
finite group, Fitting class, $\omega\sigma$-fibered, $\omega\sigma$-complete, $\omega\sigma$-local, minimal $\omega\sigma$-satellite, maximal internal $\omega\sigma$-satellite, Fitting product.
UDC:
512.542
MSC: 20D10 Received: 11.01.2021
Revised: 14.02.2021
Accepted: 24.02.2021
DOI:
10.21538/0134-4889-2021-27-1-88-97