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# BOUNDING THE ORDER OF THE NILPOTENT RESIDUAL OF A FINITE GROUP

Abstract

The last term of the lower central series of a finite group $G$ is called the nilpotent residual. It is usually denoted by $\unicode[STIX]{x1D6FE}_{\infty }(G)$ . The lower Fitting series of $G$ is defined by $D_{0}(G)=G$ and $D_{i+1}(G)=\unicode[STIX]{x1D6FE}_{\infty }(D_{i}(G))$ for $i=0,1,2,\ldots \,$ . These subgroups are generated by so-called coprime commutators $\unicode[STIX]{x1D6FE}_{k}^{\ast }$ and $\unicode[STIX]{x1D6FF}_{k}^{\ast }$ in elements of $G$ . More precisely, the set of coprime commutators $\unicode[STIX]{x1D6FE}_{k}^{\ast }$ generates $\unicode[STIX]{x1D6FE}_{\infty }(G)$ whenever $k\geq 2$ while the set $\unicode[STIX]{x1D6FF}_{k}^{\ast }$ generates $D_{k}(G)$ for $k\geq 0$ . The main result of this article is the following theorem: let $m$ be a positive integer and $G$ a finite group. Let $X\subset G$ be either the set of all $\unicode[STIX]{x1D6FE}_{k}^{\ast }$ -commutators for some fixed $k\geq 2$ or the set of all $\unicode[STIX]{x1D6FF}_{k}^{\ast }$ -commutators for some fixed $k\geq 1$ . Suppose that the size of $a^{X}$ is at most $m$ for any $a\in G$ . Then the order of $\langle X\rangle$ is $(k,m)$ -bounded.

Corresponding author
pavel@unb.br
References
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Bulletin of the Australian Mathematical Society
• ISSN: 0004-9727
• EISSN: 1755-1633
• URL: /core/journals/bulletin-of-the-australian-mathematical-society
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