出典:Wikipedia
出典:『Wikipedia』 (2011/02/26 22:19 UTC 版)
In mathematics, especially in order theory, the greatest element of a subset S of a partially ordered set (poset) is an element of S which is greater than or equal to any other element of S. The term least element is defined dually. A bounded poset is a poset that has both a greatest element and a least element.