COMBINATORICS
2004
14 years 18 days 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
DM
2008
14 years 24 days 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