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The average element order and the number of conjugacy classes of finite groups

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Let $o(G)$ be the average order of the elements of $G$, where $G$ is a finite group. We show that there is no polynomial lower bound for $o(G)$ in terms… Click to show full abstract

Let $o(G)$ be the average order of the elements of $G$, where $G$ is a finite group. We show that there is no polynomial lower bound for $o(G)$ in terms of $o(N)$, where $N\trianglelefteq G$, even when $G$ is a prime-power order group and $N$ is abelian. This gives a negative answer to a question of A.~Jaikin-Zapirain.

Keywords: element order; order; average element; conjugacy classes; order number; number conjugacy

Journal Title: Journal of Algebra
Year Published: 2020

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