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Mutation (algebra) : ウィキペディア英語版
Mutation (algebra)
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 A(a) to be the algebra with multiplication
:x
* y = (xa)y. \,
Similarly define the left (''a'',''b'') mutation A(a,b)
:x
* y = (xa)y - (yb)x. \,
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''.

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