This paper defined up-triangle equal minor diagonal matrix and up-triangle stagger minor diagonal matrix. 定义了上三角等次对角线矩阵和上三角交错次对角线矩阵;
The paper in view of the minor diagonal direction, has produced certain block matrices inverse matrix conditions of existence and the inverse matrix expression form. 针对次对角线方向,给出了某些分块矩阵的逆矩阵的存在条件及逆矩阵的表示形式。