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1 个结果
  • 简介:Inqualitativeandcombinatorialmatrixtheory,westudypropertiesofamatrixbasedonqualitativeinformation,suchasthesignsofentriesinthematrix.Amatrixwhoseen-triesarefromtheset{+,-,0}iscalledasignpatternmatrix(orsignpattern).Forare-almatrixB,bysgn(B)wemeanthesignpatternmatrixinwhicheachpositive(respec-tively,negative,zero)entryofBisreplacedby+(respectively,-,0).IfAisann×n

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