词条 | Mutation (algebra) |
释义 |
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. DefinitionsLet 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.[1] If A is a unital algebra and a is invertible, we refer to the isotope by a. Properties
Jordan algebras{{main|Mutation (Jordan algebra)}}A Jordan algebra is a commutative algebra satisfying the Jordan identity . The Jordan triple product is defined by For y in A the mutation[3] or homotope[4] Ay is defined as the vector space A with multiplication and if y is invertible this is referred to as an isotope. A homotope of a Jordan algebra is again a Jordan algebra: isotopy defines an equivalence relation.[5] If y is nuclear then the isotope by y is isomorphic to the original.[6] References1. ^1 2 Elduque & Myung (1994) p. 34 2. ^{{cite conference | last=González | first=S. | chapter=Homotope algebra of a Bernstein algebra | zbl=0787.17029 | editor1-last=Myung | editor1-first=Hyo Chul | title=Proceedings of the fifth international conference on hadronic mechanics and nonpotential interactions, held at the University of Northern Iowa, Cedar Falls, Iowa, USA, August 13–17, 1990. Part 1: Mathematics | location=New York | publisher=Nova Science Publishers | pages=149–159 | year=1992 }} 3. ^Koecher (1999) p. 76 4. ^McCrimmon (2004) p. 86 5. ^McCrimmon (2004) p. 71 6. ^McCrimmon (2004) p. 72
1 : Non-associative algebras |
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