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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 Separable sigma algebra ： ウィキペディア英語版 Separable sigma algebra In mathematics, ''σ-algebras'' are usually studied in the context of measure theory. A separable σ-algebra (or separable σ-field) is a σ-algebra $\backslash mathcal$ which is a separable space when considered as a metric space with metric $\backslash rho(A,B)\; =\; \backslash mu(A\; \backslash triangle\; B)$ for $A,B\; \backslash in\; \backslash mathcal$ and a given measure $\backslash mu$ (and with $\backslash triangle$ being the symmetric difference operator). Note that any σ-algebra generated by a countable collection of sets is separable, but the converse need not hold. For example, the Lebesgue σ-algebra is separable (since every Lebesgue measurable set is equivalent to some Borel set) but not countably generated (since its cardinality is higher than continuum). A separable measure space has a natural pseudometric that renders it separable as a pseudometric space. The distance between two sets is defined as the measure of the symmetric difference of the two sets. Note that the symmetric difference of two distinct sets can have measure zero; hence the pseudometric as defined above need not to be a true metric. However, if sets whose symmetric difference has measure zero are identified into a single equivalence class, the resulting quotient set can be properly metrized by the induced metric. If the measure space is separable, it can be shown that the corresponding metric space is, too. 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「Separable sigma algebra」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.