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单词 CanonicalBasisForSymmetricBilinearForms
释义

canonical basis for symmetric bilinear forms


If B:V×VK is a symmetric bilinear formMathworldPlanetmathover a finite-dimensional vector spaceMathworldPlanetmath, where the characteristic of the field isnot 2,then we may prove that there is an orthogonal basis such that B is represented by

a1000a2000an

Recall that a bilinear formPlanetmathPlanetmath has a well-defined rank, and denote this by r.

If K= we may choose a basis such that a1==at=1,at+1==at+p=-1 and at+p+j=0, for some integers p and t,where 1jn-t-p.Furthermore, these integers are invariants of the bilinear form.This is known as Sylvester’s Law of Inertia.B is positive definitePlanetmathPlanetmath if and only ift=n, p=0. Such a form constitutes a real inner product spaceMathworldPlanetmath.

If K= we may go further and choose a basis such that a1==ar=1 andar+j=0, where 1jn-r.

If K=Fp we may choose a basis such that a1==ar-1=1,

ar=n or ar=1;and ar+j=0, where 1jn-r, andn is the least positivePlanetmathPlanetmath quadratic non-residue.

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更新时间:2025/5/4 10:05:20