subdiagonally dominant matrices
次对角占优矩阵
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广义次对角占优矩阵 generalized subdiagonally dominant matrices
严格次对角占优矩阵 strictly subdiagonally dominant matrices
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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。
The concept of local double diagonally matrix is introduced in this paper, and three sufficient conditions of the generalized sub-diagonally dominant matrices are obtained.
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