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On maximal intersecting families of finite sets
Authors:Zoltán Füredi
Institution:Mathematical Institute of the Hungarian Academy of Sciences, V. Realtanoda u. 13-15, Budapest, Hungary
Abstract:Let r be a positive integer. A finite family H of pairwise intersecting r-sets is a maximal clique of order r, if for any set A ? H, |A| ? r there exists a member E ? H such that A ∩ E = ?. For instance, a finite projective plane of order r ? 1 is a maximal clique. Let N(r) denote the minimum number of sets in a maximal clique of order r. We prove N(r) ? 34r2 whenever a projective plane of order r2 exists. This disproves the known conjecture N(r) ? r2 ? r + 1.
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