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A127183
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Number of distinct irreducible characteristic polynomials of n X n real robust {0,1}-matrices.
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3
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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a(3)=6 because there are 6 different irreducible characteristic polynomials of 3 x 3 binary robust matrices: -1-2y-y^2+y^3,-1-2y-y^2+y^3, -1-y-y^2+y^3, -1+y-2y^2+y^3, -1+2y-3y^2+y^3, 1-y-2y^2+y^3.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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