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• W1584631835 abstract "A square real matrix is sign-nonsingular if it is forced to be nonsingular by its pattern of zero, negative, and positive entries. We give structural characterizations of sign-nonsingular matrices, digraphs with no even length dicycles, and square nonnegative real matrices whose permanent and determinant are equal. The structural characterizations, which are topological in nature, imply polynomial algorithms." @default.
• W1584631835 created "2016-06-24" @default.
• W1584631835 creator A5026300558 @default.
• W1584631835 date "2004-11-06" @default.
• W1584631835 modified "2023-09-24" @default.
• W1584631835 title "Pólya's Permanent Problem" @default.
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• W1584631835 doi "https://doi.org/10.37236/1832" @default.
• W1584631835 hasPublicationYear "2004" @default.
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