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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 Null (mathematics) ： ウィキペディア英語版 Null (mathematics) In mathematics, the word null (from (ドイツ語:null) meaning "zero", which is from (ラテン語:nullus) meaning "none") means of or related to having zero members in a set or a value of zero. Sometimes the symbol ∅ is used to distinguish "null" from 0. $\backslash aleph\_0$ is sometimes called Aleph null. In a normed vector space the null vector is the zero vector; in a seminormed vector space such as Minkowski space, null vectors are, in general, non-zero. In set theory, the null set is the set with zero elements; and in measure theory, a null set is a set with zero measure. A null space of a mapping is the part of the domain that is mapped into the null element of the image (the inverse image of the null element). In statistics, a null hypothesis is a proposition presumed true unless statistical evidence indicates otherwise. == References == 〔 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「Null (mathematics)」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.