Co-countable sets of uniqueness for series of independent random variables |
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Authors: | Francisco J Freniche |
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Institution: | Universidad de Sevilla, Departamento de Análisis Matemático, 41080-Sevilla, Spain |
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Abstract: | Given a sequence of independent random variables (fk) on a standard Borel space Ω with probability measure μ and a measurable set F, the existence of a countable set S⊂F is shown, with the property that series k∑ckfk which are constant on S are constant almost everywhere on F. As a consequence, if the functions fk are not constant almost everywhere, then there is a countable set S⊂Ω such that the only series k∑ckfk which is null on S is the null series; moreover, if there exists b<1 such that for every k and every α, then the set S can be taken inside any measurable set F with μ(F)>b. |
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Keywords: | Uniqueness sets Independent random variables |
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