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COMBINATORICS
2004
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13 years 10 months ago
Antichains on Three Levels
An antichain is a collection of sets in which no two sets are comparable under set inclusion. An antichain A is flat if there exists an integer k 0 such that every
Paulette Lieby
DM
2008
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13 years 11 months ago
On multipartite posets
Let m 2 be an integer. We say that a poset P = (X, ) is m-partite if X has a partition X = X1
Geir Agnarsson