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Given a quadratic pseudo-Boolean function f(x 1 , , x n ) written as a multilinear polynomial in its variables, Hammer et al. [7] have studied, in their paper Roof duality, complementation and persistency in quadratic 0-1 optimization , the greatest constant c such that there exists a quadratic posiform satisfying f = c + for all x {0, 1} n . Obviously c is a...
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