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Feb
11
revised Number of upper sets of size $n$ in a finite tree
+terminology
Feb
9
revised Extending a partial order to antichains
+isomorphic
Feb
4
revised Number of upper sets of size $n$ in a finite tree
note about the link with partial orders
Jan
30
revised How to understand the duality between Dilworth's theorem and Mirsky's theorem?
edited tags
Dec
9
revised Extending a partial order to antichains
+bonus question