13/02/12 00:22:28.87
その部分に相当する英訳 (版がちがうけど)
Many results in the algebra of linear transformations may be expressed
concisely in terms of matrices or tensors, once certain simple
rules and definitions known as matrix algebra have been introduced.
First we define matrix multiplication; this concept arises if we suppose
that the vector x, which is transformed in equations (7), is itself
the product of a tensor B with components b_i_k and another vector w:
Σ(k=1, n)(b_i_k w_k)=x_i (i=1,...,n)
Multiplying w by a tensor C we obtain the vector y.