出典:Wikipedia
出典:『Wikipedia』 (2011/05/31 04:30 UTC 版)
In mathematics, especially in order theory, a maximal element of a subset S of some partially ordered set is an element of S that is not smaller than any other element in S. The term minimal element is defined dually. The notion of a maximal is weaker than that of the greatest element and least element (which are also known, respectively, as maximum and minimum); indeed a partially ordered set may have multiple maximal and minimal elements. As an example, in the collection