[Merged by Bors] - chore: forward-port leanprover-community/mathlib#18958 #3920
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Match leanprover-community/mathlib#18958
algebra.group.basic
@84771a9f5f0bd5e5d6218811556508ddf476dcbd
..a07d750983b94c530ab69a726862c2ab6802b38c
algebra.group_power.lemmas
@e655e4ea5c6d02854696f97494997ba4c31be802
..a07d750983b94c530ab69a726862c2ab6802b38c
algebra.hom.units
@dc6c365e751e34d100e80fe6e314c3c3e0fd2988
..a07d750983b94c530ab69a726862c2ab6802b38c