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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Upper and lower bounds ： ウィキペディア英語版 Upper and lower bounds In mathematics, especially in order theory, an upper bound of a subset ''S'' of some partially ordered set (''K'', ≤) is an element of ''K'' which is greater than or equal to every element of ''S''.〔 The term lower bound is defined dually as an element of ''K'' which is less than or equal to every element of ''S''. A set with an upper bound is said to be bounded from above by that bound, a set with a lower bound is said to be bounded from below by that bound. The terms bounded above (bounded below) are also used in the mathematical literature for sets that have upper (respectively lower) bounds. == Examples == 5 is a lower bound for the set , but 8 is not. For the set , the only number 42 is both an upper and a lower bound; all other numbers are either an upper bound or a lower bound for that set. Every subset of the natural numbers has a lower bound, since the natural numbers have a least element (0, or 1 depending on the exact definition of natural numbers). An infinite subset of the natural numbers cannot be bounded from above. An infinite subset of the integers may be bounded from below or bounded from above, but not both. An infinite subset of the rational numbers may or may not be bounded from below and may or may not be bounded from above. Every finite subset of a non-empty totally ordered set has both upper and lower bounds. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Upper and lower bounds」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.