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Orthogonal complement : ウィキペディア英語版
Orthogonal complement
In the mathematical fields of linear algebra and functional analysis, the orthogonal complement of a subspace ''W'' of a vector space ''V'' equipped with a bilinear form ''B'' is the set ''W'' of all vectors in ''V'' that are orthogonal to every vector in ''W''. Informally, it is called the perp, short for perpendicular complement. It is a subspace of ''V''.
==General bilinear forms==
Let V be a vector space over a field F equipped with a bilinear form B. We define u to be left-orthogonal to v, and v to be right-orthogonal to u, when B(u,v)=0. For a subset W of V we define the left orthogonal complement W^\bot to be
:W^\bot=\left\\,.
There is a corresponding definition of right orthogonal complement. For a reflexive bilinear form, where B(u,v)=0 implies B(v,u)=0 for all u and v in V, the left and right complements coincide. This will be the case if B is a symmetric or an alternating form.
The definition extends to a bilinear form on a free module over a commutative ring, and to a sesquilinear form extended to include any free module over a commutative ring with conjugation.〔Adkins & Weintraub (1992) p.359〕

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