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JOURNALS // Ufimskii Matematicheskii Zhurnal // Archive

Ufimsk. Mat. Zh., 2020 Volume 12, Issue 1, Pages 83–91 (Mi ufa504)

This article is cited in 5 papers

Algebraicity of lattice of $\tau$-closed totally $\omega$-saturated formations of finite groups

V. V. Shcherbina

Belorus State University, Nezavisimosti av. 4, 220030, Minsk, Republic of Belorus

Abstract: All groups considered in this paper are assumed to be finite. The symbol $\omega$ denotes some nonempty set of primes, and $\tau$ is a subgroup functor in the sense of A.N. Skiba. We recall that a formation is a class of groups that is closed under taking homomorphic images and finite subdirect products. Functions of the form $f:\omega\cup\{\omega'\}\to\{\text{formations of groups}\}$ are called $\omega$-local satellites (formation $\omega$-functions). Such functions are used to study the structure of $\omega$-saturated formations.
The paper is devoted to studying the properties of the lattice of all closed functorially totally partially saturated formations related to the algebraicity concept for a lattice of formations. We prove that for each subgroup functor $\tau$, the lattice $l_{\omega_{\infty}}^{\tau}$ of all $\tau$-closed totally $\omega$-saturated formations is algebraic. This generalizes the results by V.G. Safonov. In particular, we show that the lattice $l_{p_{\infty}}^{\tau}$ of all $\tau$-closed totally $p$-saturated formations is algebraic as well as the lattice $l_{\infty}^{\tau}$ of all $\tau$-closed totally saturated formations. Similar results are obtained for lattices of functorially closed totally partially saturated formations corresponding to certain subgroup functors $\tau$. Thus, we find new classes of algebraic lattices of formations of finite groups.

Keywords: formation of finite groups, totally $\omega$-saturated formation, lattice of formations, $\tau$-closed formation, algebraic lattice.

UDC: 512.542

MSC: 20D10, 20F17

Received: 12.04.2019


 English version:
Ufa Mathematical Journal, 2020, 12:1, 82–90

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© Steklov Math. Inst. of RAS, 2024