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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 G-delta set ： ウィキペディア英語版 Gδ set In the mathematical field of topology, a Gδ set is a subset of a topological space that is a countable intersection of open sets. The notation originated in Germany with ''G'' for ''Gebiet'' (''German'': area, or neighbourhood) meaning open set in this case and δ for ''Durchschnitt'' (''German'': intersection). The term inner limiting set is also used. Gδ sets, and their dual Fσ sets, are the second level of the Borel hierarchy. ==Definition== In a topological space a Gδ set is a countable intersection of open sets. The Gδ sets are exactly the level $\backslash mathbf^0\_2$ sets of the Borel hierarchy. 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「Gδ set」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.