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R. Ahlswede, Zhen Zhang (1990)
An identity in combinatorial extremal theoryAdvances in Mathematics, 80
T. Thu (1993)
An Induction Proof of the Ahlswede-Zhang IdentityJ. Comb. Theory, Ser. A, 62
D. Daykin, T. Thu (1994)
The Dual of the Ahlswede - Zhang IdentityJ. Comb. Theory, Ser. A, 68
Let Ω be the set {1, 2, …, n}, and let Ø be the empty set. Let G be the family of all non‐empty sets of subsets of Ω. For A ∈ G and X ⊆ Ω, put ZA(X)={Øif there is noA∈AwithA⊆X,∩A∈A,A⊆XAotherwise.
Bulletin of the London Mathematical Society – Wiley
Published: Nov 1, 1997
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