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On intersections of nilpotent subgroups in finite groups with socle $L_2(2^m)\times L_2(2^n)$
V. I. Zenkovab a Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
b Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
Abstract:
In Theorem 1, it is proved for a finite group $G$ with socle $L_2(2^m)\times L_2(2^n)$ and nilpotent subgroups $A$ and $B$ that the condition $\min_G(A,B)\ne 1$ implies that $n=m=2$ and the subgroups $A$ and $B$ are $2$-groups. Here the subgroup $\min_G(A,B)$ is generated by smallest-order intersections of the form $A\cap B^g$, $g\in G$, and the subgroup $\mathrm{Min}_G(A,B)$ is generated by all intersections of the form $A\cap B^g$, $g\in G$, that are minimal with respect to inclusion. In Theorem 2, for a finite group $G$ with socle $A_5\times A_5$ and a Sylow 2-subgroup $S$, we give a description of the subgroups $\min_G(S,S)$ and $\mathrm{Min}_G(S,S)$. On the basis of Theorem 2, in Theorem 3 for a finite group $G$ with socle $A_5\times A_5$ we describe up to conjugation all pairs of nilpotent subgroups $(A,B)$ of $G$ for which $\min_G(A,B)\ne 1$.
Keywords:
finite groups, nilpotent subgroup, intersection of subgroups.
Received: 03.07.2018 Revised: 24.10.2018 Accepted: 29.10.2018
Citation:
V. I. Zenkov, “On intersections of nilpotent subgroups in finite groups with socle $L_2(2^m)\times L_2(2^n)$”, Trudy Inst. Mat. i Mekh. UrO RAN, 24, no. 4, 2018, 126–134
Linking options:
https://www.mathnet.ru/eng/timm1580 https://www.mathnet.ru/eng/timm/v24/i4/p126
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Abstract page: | 197 | Full-text PDF : | 48 | References: | 52 |
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