Abstract
A collection A0,A1,…,At of finite sets is called a pseudo sunflower of size t+1 and with center C if C is a proper subset of A0 and the sets A0∖C,…,At∖C are pairwise disjoint. The main result shows that every collection of more than tk distinct k-element sets contains a pseudo sunflower of size t+1. The bound is best possible.
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