(Q2859736)
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Wikipedia(5 entries)
- enwiki Tree (set theory)
- frwiki Arbre (mathématiques)
- kowiki 나무 (집합론)
- ptwiki Árvore (teoria dos conjuntos)
- zhwiki 树 (集合论)
partially ordered set such that, for any element, the subset of elements less than it is well-ordered