We introduced the concept of block directed edge cover diagonal quasi dominant matrix, obtained a new nonsingularity criteria for matrices and distribution theorem on eigenvalues of matrix.
引进了拟块有向边覆盖对角占优矩阵概念，给出了新的矩阵非奇异判定定理和特征值分布定理。
A concept of symmetric diagonal A-factor block circulant matrices and some of their prop- crtics are given, the main theorems are extended.
给出了对称对角A-因子循环分块矩阵的概念，讨论了它的一些性质，推广了几个主要定理．。
A concept of symmetric diagonal A-factor block circulant matrices and some of their prop- crtics are given, the main theorems are extended.
给出了对称对角A-因子循环分块矩阵的概念，讨论了它的一些性质，推广了几个主要定理．。
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