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About: XYZ inequality     Goto   Sponge   NotDistinct   Permalink

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In combinatorial mathematics, the XYZ inequality, also called the Fishburn–Shepp inequality, is an inequality for the number of linear extensions of finite partial orders. The inequality was conjectured by Ivan Rival and Bill Sands in 1981. It was proved by Lawrence Shepp in . An extension was given by Peter Fishburn in . It states that if x, y, and z are incomparable elements of a finite poset, then , where P(A) is the probability that a linear order extending the partial order has the property A. The proof uses the Ahlswede–Daykin inequality.