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单词 QuadraticAlgebra
释义

quadratic algebra


A non-associative algebra A (with unity 1A) over a commutativering R (with unity 1R) is called a quadratic algebra ifA admits a quadratic formMathworldPlanetmath Q:AR such that

  1. 1.

    Q(1A)=1R,

  2. 2.

    the quadratic equation x2-b(1A,x)x+Q(x)1A=0 is satisfiedby all xA, where b is the associated symmetric bilinear formMathworldPlanetmathgiven by b(x,y):=Q(x+y)-Q(x)-Q(y).

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