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In the theory of algebras over a field, mutation is a construction of a new binary operation related to the multiplication of the algebra. In specific cases the resulting algebra may be referred to as a homotope or an isotope of the original. ==Definitions== Let ''A'' be an algebra over a field ''F'' with multiplication (not assumed to be associative) denoted by juxtaposition. For an element ''a'' of ''A'', define the left ''a''-homotope to be the algebra with multiplication : Similarly define the left (''a'',''b'') mutation : Right homotope and mutation are defined analogously. Since the right (''p'',''q'') mutation of ''A'' is the left (−''q'', −''p'') mutation of the opposite algebra to ''A'', it suffices to study left mutations.〔Elduque & Myung (1994) p. 34〕 If ''A'' is a unital algebra and ''a'' is invertible, we refer to the isotope by ''a''. 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「Mutation (algebra)」の詳細全文を読む スポンサード リンク
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