The concept of local double diagonally matrix is introduced in this paper, and three sufficient conditions of the generalized sub-diagonallydominant matrices are obtained.
提出局部次对角占优矩阵的概念，得到了广义次对角占优矩阵的二个充分条件。
2
This article introduces the concept of local diagonallydominant matrics, studies the properties and eigenvalues of the matrics and offers its application in stability theory.
引进了弱局部对角占优阵的概念，研究这类矩阵的性质及其特征值问题，并给出了在稳定性理论中的应用。
3
The estimation on the inverse elements of strictly diagonallydominant tridiagonal matrix is established; in this estimation, the nonnegative condition of matrix elements is moved.