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Trudy Instituta Matematiki i Mekhaniki UrO RAN, 2022, Volume 28, Number 2, Pages 187–192
DOI: https://doi.org/10.21538/0134-4889-2022-28-2-187-192
(Mi timm1914)
 

On mixed normal subgroups of the group Lim($\mathbb{N}$)

A. I. Sozutov, N. M. Suchkov, N. G. Suchkova

Siberian Federal University, Krasnoyarsk
References:
Abstract: Let $\mathbb{N}$ be the set of natural numbers. A permutation $g$ of the set $\mathbb{N}$ is called limited if there exists $\alpha\in \mathbb{N}$ such that $|\beta-\beta^g|\leqslant|\alpha-\alpha^g|$ for every $\beta\in \mathbb{N}$. Denote by $G=\mathrm{Lim}(\mathbb{N})$ the group of all limited permutations of the set $\mathbb{N}$. In 2010 N. M. Suchkov and N. G. Suchkova proved that $G = AB$, where $A$ and $B$ are locally finite subgroups of $G$. In 2016 the same authors described the locally finite radical $R$ of the group $G$. In particular, the following result was proved: if $H$ is a normal subgroup of $G$, then either $H\leqslant R$ or $H$ is a mixed subgroup of $G$. In this paper we study mixed normal subgroups of the group $G$. It is proved that there exists a continuum set of such subgroups. We give examples of infinitely decreasing and infinitely increasing chains of mixed normal subgroups of $G$. In 2020 the authors proved similar results for locally finite normal subgroups of $G$.
Keywords: group, limited permutation, mixed group, normal subgroup, chains of subgroups.
Funding agency Grant number
Russian Science Foundation 19-71-10017
Ministry of Science and Higher Education of the Russian Federation 075-02-2022-876
The research of the first author on the construction of infinitely decreasing and infinitely increasing chains of mixed normal subgroups of the group Lim($\mathbb{N}$) (Theorem 1) was supported by the Russian Science Foundation (project no. 19-71-10017). The research of the second and third authors was supported by the Krasnoyarsk Mathematical Center, which is financed by the Ministry of Science and Higher Education of the Russian Federation (agreement no. 075-02-2022-876).
Received: 23.02.2022
Revised: 30.03.2022
Accepted: 04.04.2022
Bibliographic databases:
Document Type: Article
UDC: 512.54
MSC: 20B07, 20B30, 20B35
Language: Russian
Citation: A. I. Sozutov, N. M. Suchkov, N. G. Suchkova, “On mixed normal subgroups of the group Lim($\mathbb{N}$)”, Trudy Inst. Mat. i Mekh. UrO RAN, 28, no. 2, 2022, 187–192
Citation in format AMSBIB
\Bibitem{SozSucSuc22}
\by A.~I.~Sozutov, N.~M.~Suchkov, N.~G.~Suchkova
\paper On mixed normal subgroups of the group Lim($\mathbb{N}$)
\serial Trudy Inst. Mat. i Mekh. UrO RAN
\yr 2022
\vol 28
\issue 2
\pages 187--192
\mathnet{http://mi.mathnet.ru/timm1914}
\crossref{https://doi.org/10.21538/0134-4889-2022-28-2-187-192}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=4453867}
\elib{https://elibrary.ru/item.asp?id=48585959}
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