(Q3229348)

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Zassenhaus lemma

technical lemma in group theory

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Butterfly lemma.svg
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Hans Zassenhaus

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defining formula

B\mathrel {\vartriangleleft } A\leq G\geq C\mathrel {\vartriangleright } D\implies {\frac {(A\cap C)B}{(A\cap D)B}}\cong {\frac {(A\cap C)D}{(B\cap C)D}}

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WikiProject Mathematics

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Microsoft Academic ID

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