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- This question is one case of the problem of counting [[order ideal]]s or [[antichain]]s in [[poset]]s. Specifically, it ask for the number of order ideals of t2 KB (443 words) - 21:41, 22 December 2021
- * [[Antichain]]s are posets in which no two elements are comparable.4 KB (717 words) - 19:01, 25 April 2009