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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 diagonal intersection ： ウィキペディア英語版 diagonal intersection Diagonal intersection is a term used in mathematics, especially in set theory. If $\backslash displaystyle\backslash delta$ is an ordinal number and is a sequence of subsets of $\backslash displaystyle\backslash delta$, then the ''diagonal intersection'', denoted by :$\backslash displaystyle\backslash Delta\_\; X\_\backslash alpha,$ is defined to be :$\backslash displaystyle\backslash .$ That is, an ordinal $\backslash displaystyle\backslash beta$ is in the diagonal intersection $\backslash displaystyle\backslash Delta\_\; X\_\backslash alpha$ if and only if it is contained in the first $\backslash displaystyle\backslash beta$ members of the sequence. This is the same as :$\backslash displaystyle\backslash bigcap\_\; (\; (\backslash alpha)\; \backslash cup\; X\_\backslash alpha\; ),$ where the closed interval from 0 to $\backslash displaystyle\backslash alpha$ is used to avoid restricting the range of the intersection. ==See also== *Fodor's lemma *Club set *Club filter 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「diagonal intersection」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.