… f ( x + x ', y ) = f ( x , y ) + f ( x ', y ) f ( x , y + y ') = f ( x , y ) + f ( x , y ') f ( ax , y ) = f ( x , ay ) = af ( x , y ) For any x , y , if f ( x , y ) = 0, then it is bilinear, but this is a trivial bilinear map. There is a bilinear map that has the fewest pairs of x , y whose image is 0, and the tensor product described below is a concrete way to construct this. One way to construct a tensor product is to introduce the minimum necessary relationship such that for each x ∈ M and y ∈ N , f ( x , y ) = xy is a bilinear map. … *Some of the terminology explanations that mention "tensor product" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… f(x+x′,y)=f(x,y)+f(x′,y) f(x,y+y′)=f(x,y)+f(x,y′) f(ax,y)=f(x,ay)=af(x,y) 任意のx,yについて,f(x,y)=0であれば双線形であるが,これはつまらない双線形写像である。像が0になるようなx,yの組がいちばん少ないような双線形写像があり,それを具体的に構成しうるのが,次に述べるテンソル積tensor productである。テンソル積の一つの構成法は各x∈Mおよびy∈Nに対して,f(x,y)=xyが双線形写像であるような,必要最小限の関係を導入するのであるといいうる。… ※「tensor product」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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