Произведе́ние ме́р в функциональном анализе, теории вероятностей и смежных дисциплинах — формальный способ построить меру на декартовом произведении двух пространств с мерами.

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dbpedia-owl:abstract
• Произведе́ние ме́р в функциональном анализе, теории вероятностей и смежных дисциплинах — формальный способ построить меру на декартовом произведении двух пространств с мерами.
• In mathematics, given two measurable spaces and measures on them, one can obtain a product measurable space and a product measure on that space. Conceptually, this is similar to defining the Cartesian product of sets and the product topology of two topological spaces, except that there can be many natural choices for the product measure.Let and be two measurable spaces, that is, and are sigma algebras on and respectively, and let and be measures on these spaces. Denote by the sigma algebra on the Cartesian product generated by subsets of the form , where and This sigma algebra is called the tensor-product σ-algebra on the product space.A product measure is defined to be a measure on the measurable space satisfying the property for all . (In multiplying measures, some of which are infinite, we define the product to be zero if any factor is zero.)In fact, when the spaces are -finite, the product measure is uniquely defined, and for every measurable set E,where Ex = {y∈X2|(x,y)∈E}, and Ey = {x∈X1|(x,y)∈E}, which are both measurable sets.The existence of this measure is guaranteed by the Hahn–Kolmogorov theorem. The uniqueness of product measure is guaranteed only in the case that both (X1,Σ1,μ1) and (X2,Σ2,μ2) are σ-finite.The Borel measure on the Euclidean space Rn can be obtained as the product of n copies of the Borel measure on the real line R.Even if the two factors of the product space are complete measure spaces, the product space may not be. Consequently, the completion procedure is needed to extend the Borel measure into the Lebesgue measure, or to extend the product of two Lebesgue measures to give the Lebesgue measure on the product space.The opposite construction to the formation of the product of two measures is disintegration, which in some sense "splits" a given measure into a family of measures that can be integrated to give the original measure.
• In mathematica, una misura prodotto è una misura definita sulla sigma-algebra prodotto di due spazi di misura.
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• en
prop-fr:lienAuteur
• Paul Halmos
• Michel Loève
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• Halmos
• Loève
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• 35 (xsd:integer)
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• 135 (xsd:integer)
• 143 (xsd:integer)
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• Michel
• Paul
prop-fr:titre
• Measure theory
• Probability Theory vol. I
prop-fr:titreChapitre
• Product measures
• Product measures and iterated integrals
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• Springer
dcterms:subject
rdfs:comment
• Произведе́ние ме́р в функциональном анализе, теории вероятностей и смежных дисциплинах — формальный способ построить меру на декартовом произведении двух пространств с мерами.
• In mathematica, una misura prodotto è una misura definita sulla sigma-algebra prodotto di due spazi di misura.
• In mathematics, given two measurable spaces and measures on them, one can obtain a product measurable space and a product measure on that space. Conceptually, this is similar to defining the Cartesian product of sets and the product topology of two topological spaces, except that there can be many natural choices for the product measure.Let and be two measurable spaces, that is, and are sigma algebras on and respectively, and let and be measures on these spaces.
rdfs:label
• Mesure produit
• Miara produktowa
• Misura prodotto
• Product measure
• Productmaat
• Produktmaß
• Произведение мер
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