103
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COMBINATORICS
2004
15 years 2 months ago
2004
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
106
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DM
2008
15 years 3 months ago
2008
Let m 2 be an integer. We say that a poset P = (X, ) is m-partite if X has a partition X = X1