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    A generalization of the AZ identity

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    Ahlswede R, Cai N. A generalization of the AZ identity. Combinatorica. 1993;13(3):241-247.The identity discovered in [1] can be viewed as a sharpening of the LYM inequality ([3], [4], [5]). It was extended in [2] so that it covers also Bollobás' inequality [6]. Here we present a further generalization and demonstrate that it shares with its predecessors the usefullness for uniqueness proofs in extremal set theory
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