矩阵的直积矩阵积
The direct product of a matrix and the product of a matrix
以上为机器翻译结果，长、整句建议使用 人工翻译 。
王中德(1989)推广了矩阵直积，给出了矩阵第二类直积和第三类直积运算，并将此运算应用于正交变换的构造。
The matrix direct product is generalized and two kinds of direct products are given by Wang Zhongde (1989). These two kinds of direct products are applied to the construction of orthogonal transforms.
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