normal subgroup

Fetched 2026-10-26 (cache).

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Noun

1. {{lb|en|group theory}} A subgroup ''H'' of a group ''G'' that is [[invariant]] under [[conjugation]]; that is, for all elements ''h'' of ''H'' and for all elements ''g'' in ''G'', the element ''ghg''⁻¹ is in ''H''.

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