The Cameron-Liebler problem for sets
Abstract
Cameron-Liebler line classes and Cameron-Liebler k-classes in PG(2k+1,q) are currently receiving a lot of attention. Links with the Erdos-Ko-Rado results in finite projective spaces occurred. We introduce here in this article the similar problem on Cameron-Liebler classes of sets, and solve this problem completely, by making links to the classical Erdos-Ko-Rado result on sets. We also present a characterisation theorem for the Cameron-Liebler classes of sets.
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