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Cylindrical σ-algebra : ウィキペディア英語版 | Cylindrical σ-algebra
In mathematics — specifically, in measure theory and functional analysis — the cylindrical σ-algebra is a σ-algebra often used in the study of probability measures and random variables on Banach spaces. For a Banach space ''X'', the cylindrical σ-algebra Cyl(''X'') is defined to be the coarsest σ-algebra (i.e. the one with the fewest measurable sets) such that every continuous linear function on ''X'' is a measurable function. In general, Cyl(''X'') is ''not'' the same as the Borel σ-algebra on ''X'', which is the coarsest σ-algebra that contains all open subsets of ''X''. == See also ==
* Cylinder set * Cylinder set measure
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