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math.CO2011
Two-part set systems
Dániel Gerbner, Péter L. Erdős, Nathan Lemons +3
The two part Sperner theorem of Katona and Kleitman states that if is an -element set with partition , and $\cF$ is a family of subsets of such that no two…
math.CO2011★ 5 cited
Asymptotically normal distribution of some tree families relevant for phylogenetics, and of partitions without singletons
Eva Czabarka, Peter L. Erdos, Virginia Johnson +2
P.L. Erdos and L.A. Szekely [Adv. Appl. Math. 10(1989), 488-496] gave a bijection between rooted semilabeled trees and set partitions. L.H. Harper's results [Ann. Math. Stat. 38(19…