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Measure, randomness and sublocalesSimpson, AlexThis paper investigates aspects of measure and randomness in the context of locale theory (point-free topology). We prove that every measure (▫$\sigma $▫-continuous valuation) ▫$\mu$▫ on the ... ▫$\sigma$▫-frame of opens of a fitted ▫$\sigma$▫-locale ▫$X$▫ extends to a measure on the lattice of all ▫$\sigma$▫-sublocales of ▫$X$▫ (Theorem 1). Furthermore, when ▫$\mu$▫ is a finite measure with ▫$\mu (X) = M$▫, the ▫$\sigma$▫-locale ▫$X$▫ has a smallest ▫$\sigma$▫-sublocale of measure ▫$M$▫ (Theorem 2). In particular, when ▫$\mu$▫ is a probability measure, ▫$X$▫ has a smallest ▫$\sigma$▫-sublocale of measure 1. All ▫$\sigma$▫ prefixes can be dropped from these statements whenever ▫$X$▫ is a strongly Lindelöf locale, as is the case in the following applications. When ▫$\mu$▫ is the Lebesgue measure on the Euclidean space ▫$\mathbb{R}^{n}$▫, Theorem 1 produces an isometry-invariant measure that, via the inclusion of the powerset ▫$\mathcal{P}(\mathbb{R}^{n})$▫ in the lattice of sublocales, assigns a weight to every subset of ▫$\mathbb{R}^{n}$▫. (Contradiction is avoided because disjoint subsets need not be disjoint as sublocales.) When▫ $\mu$▫ is the uniform probability measure on Cantor space ▫$\{0,1\}^{\omega }$▫, the smallest measure-1 sublocale, given by Theorem 2, provides a canonical locale of random sequences, where randomness means that all probabilistic laws (measure-1 properties) are satisfied.Source: Annals of pure and applied Logic. - ISSN 0168-0072 (Vol. 163, iss. 11, 2012, str. 1642-1659)Type of material - article, component part ; adult, seriousPublish date - 2012Language - englishCOBISS.SI-ID - 17091161
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source: Annals of pure and applied Logic. - ISSN 0168-0072 (Vol. 163, iss. 11, 2012, str. 1642-1659)
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Simpson, Alex | 37834 |
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