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Frankl, Peter


Graph Theory » Hypergraphs

Frankl's union-closed sets conjecture ★★

Author(s): Frankl

Conjecture   Let $ F $ be a finite family of finite sets, not all empty, that is closed under taking unions. Then there exists $ x $ such that $ x $ is an element of at least half the members of $ F $.

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Posted by tchow
updated December 17th, 2009
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