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Non-nilpotent subgroups of locally graded groups

Mohammad Zarrin — 2015

Colloquium Mathematicae

We show that a locally graded group with a finite number m of non-(nilpotent of class at most n) subgroups is (soluble of class at most [log₂n] + m + 3)-by-(finite of order ≤ m!). We also show that the derived length of a soluble group with a finite number m of non-(nilpotent of class at most n) subgroups is at most [log₂ n] + m + 1.

On the number of isomorphism classes of derived subgroups

Leyli Jafari Taghvasani; Soran Marzang; Mohammad Zarrin — 2019

Czechoslovak Mathematical Journal

We show that a finite nonabelian characteristically simple group $G$ satisfies $n = | π (G) | + 2$ if and only if $G ≅ A_{5}$ , where $n$ is the number of isomorphism classes of derived subgroups of $G$ and $π (G)$ is the set of prime divisors of the group $G$ . Also, we give a negative answer to a question raised in M. Zarrin (2014).

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