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Definition of Normal subgroup
1. Noun. (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''. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Normal Subgroup
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