Sign patterns of nonnegative normal matr
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Zhongshan Li; Frank Hall; Fuzhen Zhang
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Article
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1997
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Elsevier Science
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English
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By a nonnegative sign pattern we mean a matrix whose entries are from the set { +, 0). A nonnegative sign pattern A is said to allow normality if there is a normal matrix B whose entries have signs indicated by A. In this paper the combinatorial structure of nonnegative normal matrices, in particula