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zbMATH Open
Article . 1990
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Proceedings of the American Mathematical Society
Article . 1990 . Peer-reviewed
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Proceedings of the American Mathematical Society
Article . 1990 . Peer-reviewed
Data sources: Crossref
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Lifting Theorems in Nonstandard Measure Theory

Lifting theorems in nonstandard measure theory
Authors: Ross, David;

Lifting Theorems in Nonstandard Measure Theory

Abstract

1. A nonstandard capacity construction, analogous to Loeb’s measure construction, is developed. Using this construction and Choquet’s Capacitability theorem, it is proved that a Loeb measurable function into a general (not necessarily second countable) space has a lifting precisely when its graph is ’almost’ analytic. This characterization is used to generalize and simplify some known lifting existence theorems. 2. The standard notion of ’Lusin measurability’ is related to the nonstandard notion of admitting a ’two-legged’ lifting. An immediate consequence is a new and simple proof of the general Lusin theorem. Another consequence is the existence of a Loeb measurable function, not admitting a lifting, into a relatively small topological space.

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Keywords

Loeb-measurability, Lifting theory, Nonstandard models in mathematics, Classes of sets (Borel fields, \(\sigma\)-rings, etc.), measurable sets, Suslin sets, analytic sets, nonstandard capacity construction, Nonstandard measure theory, Lusin-measurability, precapacity, special saturated models of the universe, Measurable and nonmeasurable functions, sequences of measurable functions, modes of convergence, lifting

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Average
Top 10%
Average
bronze
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