翻訳と辞書 Words near each other ・ Differential group delay ・ Differential heat treatment ・ Differential ideal ・ Differential inclusion ・ Differential inheritance ・ Differential interference contrast microscopy ・ Differential invariant ・ Differential item functioning ・ Differential Manchester encoding ・ Difference and Repetition ・ Difference density map ・ Difference due to memory ・ Difference engine ・ Difference feminism ・ Difference gel electrophoresis ・ Difference hierarchy ・ Difference in differences ・ Difference in the depth of modulation ・ Difference list ・ Difference of Gaussians ・ Difference of Opinion ・ Difference of two squares ・ Difference polynomials ・ Difference quotient ・ Difference set ・ Difference theory ・ Difference United ・ Difference-map algorithm ・ Differences (journal) ・ Differences (song) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Difference hierarchy ： ウィキペディア英語版 Difference hierarchy In set theory, the difference hierarchy over a pointclass is a hierarchy of larger pointclasses generated by taking differences of sets. If Γ is a pointclass, then the set of differences in Γ is $\backslash$. In usual notation, this set is denoted by 2-Γ. The next level of the hierarchy is denoted by 3-Γ and consists of differences of three sets: $\backslash$. This definition can be extended recursively into the transfinite to α-Γ for some ordinal α.〔.〕 In the Borel hierarchy, Felix Hausdorff and Kazimierz Kuratowski proved that the countable levels of the difference hierarchy over Π0γ give Δ0γ+1.〔. See in particular (p. 173 ).〕 ==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「Difference hierarchy」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.