partially ordered set

偏序集合（英語：Partially ordered set，简写Poset）是数学中，特别是序理论中，指配备了偏序关系的集合。 这个理论将对集合的元素进行排序、顺序或排列等直觉概念抽象化。这种排序不必是全部的，就是说不需要保证此集合内的所有对象的相互可比较性。偏序空間（英语：Partially ordered space）是具有閉偏序的拓撲空間。

from v to w contains no other vertex. Take X to be a partially ordered set（英语：partially ordered set）. If T1, T2 are rooted trees with vertices labeled in

Kanamori, Akihiro (编). Handbook of Set Theory [集合論手冊]. Springer. 2010 （英语）.  Dushnik, Ben; Miller, E. W., Partially ordered sets [偏序集], American Journal of

Harzheim, Egbert. 8.2 The notions well-quasi-ordered and partially well-ordered set [第8.2節：良擬序與偏良序集之概念]. Ordered sets [有序集]. [2021-12-20]. doi:10.1007/0-387-24222-8_9

Stratofortress Arc Light strikes conducted in South Vietnam were based, at least partially, on the data from these three programs. On 6 October 1967, "Drillpress"