EXTREMAL CASES OF SN-MATRICES Kim, Si-Ju; Choi, Tae-Young;
We denote by (A) the set of all real matrices with the same sign pattern as a real matrix A. A matrix A is an SN-matrix provided there exists a set S of sign pattern such that the set of sign patterns of vectors in the -space of is S, for each . Some properties of SN-matrices arc investigated.
zero patterns;conformal contractions;signed null-spaces;
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