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Extremal copositive matrices with minimal zero supports of cardinality two
Let be an extremal copositive matrix with unit diagonal.
Then the minimal zeros of all have supports of cardinality two if and only
if the elements of are all from the set . Thus the extremal
copositive matrices with minimal zero supports of cardinality two are exactly
those matrices which can be obtained by diagonal scaling from the extremal
unit diagonal matrices characterized by Hoffman and Pereira in
1973.Comment: 4 page
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