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Schreier's lemma : ウィキペディア英語版 | Schreier's lemma In mathematics, Schreier's lemma is a theorem in group theory used in the Schreier–Sims algorithm and also for finding a presentation of a subgroup. ==Definition==
Suppose is a subgroup of , which is finitely generated with generating set , that is, ''G'' = . Let be a right transversal of in . In other words, is (the image of) a section of the quotient map , where denotes the set of right cosets of in . We make the definition that given ∈, is the chosen representative in the transversal of the coset , that is, : Then is generated by the set :
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Schreier's lemma」の詳細全文を読む
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