Quantum Information & Computation
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In this paper we prove that the inequality introduced by Collins, Gisin, Linden, Massar and Popescu [11] is tight, or in other words, it is a facet of the convex polytope generated by all local-realistic joint probabilities of d outcomes. This means that this inequality is optimal. We also show that, for correlation functions generalized to deal with three-outcome measurements, the satisfyability of this inequality is a necessary and sufficient condition for the existence of a local-realistic model accounting for them.