Geodesic
A metanilpotency criterion for a finite solvable group
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 23 (2017) no. 4, pp. 253-256 Cet article a éte moissonné depuis la source Math-Net.Ru

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Denote by $|x|$ the order of an element $x$ of a group. An element of a group is called primary if its order is a nonnegative integer power of a prime. If $a$ and $b$ are primary elements of coprime orders of a group, then the commutator $a^{-1}b^{-1}ab$ is called a $\star$-commutator. The intersection of all normal subgroups of a group such that the quotient groups by them are nilpotent is called the nilpotent residual of the group. It is established that the nilpotent residual of a finite group is generated by commutators of primary elements of coprime orders. It is proved that the nilpotent residual of a finite solvable group is nilpotent if and only if $|ab|\ge|a||b|$ for any $\star$-commutators of $a$ and $b$ of coprime orders.
Keywords: finite group, residual, nilpotent group, commutator.
Mots-clés : formation 
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V. S. Monakhov. A metanilpotency criterion for a finite solvable group. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 23 (2017) no. 4, pp. 253-256. http://geodesic.mathdoc.fr/item/TIMM_2017_23_4_a23/

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