Ling-Zhi Ren

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A matrix A is said to have signed null space provided there exists a set S of sign patterns such that the set of sign patterns of vectors in the null space of˜A is S for each˜A ∈ Q(A). It is a generalization of a number of important qualitative matrix classes such as L-matrices, S *-matrices, totally L-matrices, etc. In this paper, we obtain some new(More)
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