On the length of finite factorized groups

Khukhro, E. I. and Shumyatsky, P. (2015) On the length of finite factorized groups. [MIMS Preprint]

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Abstract

The nonsoluble length~$\lambda (G)$ of a finite group~$G$ is defined as the minimum number of nonsoluble factors in a normal series each of whose factors either is soluble or is a direct product of nonabelian simple groups. The generalized Fitting height of a finite group~$G$ is the least number $h=h^*(G)$ such that $F^*_h(G)=G$, where $F^*_1(G)=F^*(G)$ is the generalized Fitting subgroup, and $F^*_{i+1}(G)$ is the inverse image of $F^*(G/F^*_{i}(G))$. It is proved that if a finite group $G=AB$ is factorized by two subgroups of coprime orders, then the nonsoluble length of~$G$ is bounded in terms of the generalized Fitting heights of~$A$ and~$B$. It is also proved that if, say, $B$ is soluble of derived length~$d$, then the generalized Fitting height of~$G$ is bounded in terms of~$d$ and the generalized Fitting height of~$A$.

Item Type: MIMS Preprint
Subjects: MSC 2010, the AMS's Mathematics Subject Classification > 20 Group theory and generalizations
Depositing User: Professor Evgeny Khukhro
Date Deposited: 24 Feb 2015
Last Modified: 08 Nov 2017 18:18
URI: http://eprints.maths.manchester.ac.uk/id/eprint/2256

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