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combinatorial bounds 1cross-intersection 1extremal combinatorics 1intersecting families 1set systems 1

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1 paper

math.CO2026

On nontrivial cross-2-intersecting families

Jingjun Bao, Lijun Ji, Liying Yu

The paper determines the maximum possible product of the sizes of two nontrivial cross‑2‑intersecting families of k‑ and ℓ‑subsets of an n‑element set, and describes the families t…