摘要
本文列举了两个关于矩阵分块乘法的等式．通过证明著名的Cauchy公式，推证求矩阵秩的“降阶法”以及论证特殊正定矩阵的两个结论，揭示了两个等式的重要应用．
This paper examplifies two equations of matric dividable multiplication. By proving the famous formula Cauchy and deducing the renk-reduced method in matric order and two conclusions of special positive definite reparable matric,it presents the important application of the two equations.
关键词
矩阵分块乘法
方阵的行列式
矩阵的秩
正定矩阵
matric separable multiplication
matric determinant
matric order
positive definite matric
