Where can I find these two result? And how to charicterize $Z_2$-extension of an Abelian group? If not, can we conunt the number of $Z_2$-extension of an Abelian group? Thank you for your help!
2026-03-25 23:38:43.1774481923
Classification of groups of order $2p^3$ and $2p^4$.
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