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中文摘要：
利用弱链对角占优M-矩阵A与它的逆A-1以及A的主子矩阵B的逆B-1,它们元素之间的关系式结合严格对角占优M-矩阵的逆矩阵元素界的新估计式,得到了‖A-1‖∞新的上界.
英文摘要：
Weak chain diagonally dominant M-matrix A,its inverse matrix A-1,and the inverse B-1 for the principal submatrix B of A were used,and the relations between their elements combined with the new estimator of the elements for the inverse matrix of strictly diagonally dominant M-matrix were studied to obtain the new upper bound ‖A-1‖.
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