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math.CO2017
Two Stronger Versions of the Union-closed Sets Conjecture
Zhen Cui, Ze-Chun Hu
The union-closed sets conjecture (Frankl's conjecture) says that for any finite union-closed family of finite sets, other than the family consisting only of the empty set, there ex…
math.CO2011★ 1 cited
On variants of conflict-free-coloring for hypergraphs
Zhen Cui, Ze-Chun Hu
Conflict-free coloring is a kind of vertex coloring of hypergraphs requiring each hyperedge to have a color which appears only on one vertex. More generally, for a positive integer…