Thu 2023-05-11 . 11:51 AM$G/Z(G)$ cyclic implies $G$ is abelian. Thu 2023-05-11 . 11:51 AMCenter of quarternion group. Thu 2023-05-11 . 11:51 AMCenter of dihedral groups. Thu 2023-05-11 . 11:51 AMThe 5/8 theorem, and the most abelian non-abelian groups.

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