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多重線形性

Last updated at Posted at 2020-04-04

多重線形性

$ 写像 F(x_1,x_2, \cdots, x_n)$ に対して

\begin{align}
F(x_1, \cdots, \color{red}{x_j’+x_j’’}, \cdots, x_n) 
&= F(x_1, \cdots, \color{red}{x_j’}, \cdots, x_n) \\
&+ F(x_1, \cdots, \color{red}{x_j'’}, \cdots, x_n)  \qquad \cdots (1)
\\\\[1pt]
F(x_1, \cdots, \color{red}{c}x_i, \cdots, x_n) &= \color{red}{c}F(x_1, \cdots, x_i, \cdots, x_n) \qquad \cdots (2)
\end{align}

を表満たす場合、F は 多重線形性 を持つという

この性質より

\begin{align}
F(x_1, \cdots, c \ {(x_i’+x_i’’)}, \cdots, x_n) 
&= c \ F(x_1, \cdots, x_i’, \cdots, x_n) + c \ F(0, \cdots, x_i'’, \cdots, 0) 
\end{align}

と表現できる

参照

線形代数入門(斎藤 正彦 著)

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