Some examples of Borel sets
Ryszard Engelking, Włodzimierz Holsztyński, Roman Sikorski (1966)
Colloquium Mathematicum
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Ryszard Engelking, Włodzimierz Holsztyński, Roman Sikorski (1966)
Colloquium Mathematicum
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Dorothy Maharam (1980)
Fundamenta Mathematicae
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László Zsilinszky (1999)
Mathematica Slovaca
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E. Lorch (1968)
Studia Mathematica
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A. H. Stone
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CONTENTS1. Introduction.................................................................................. 32. Baire spaces................................................................................ 53. The basic theorem..................................................................... 94. Cardinality properties; invariance of weight........................... 165. Classification of absolute Borel sets..................................... 226. Characterizations..........................................................................
Anna Kucia (1990)
Commentationes Mathematicae Universitatis Carolinae
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Maxim R. Burke (2007)
Fundamenta Mathematicae
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R. A. Johnson showed that there is no translation-invariant Borel lifting for the measure algebra of ℝ/ℤ equipped with Haar measure, a result which was generalized by M. Talagrand to non-discrete locally compact abelian groups and by J. Kupka and K. Prikry to arbitrary non-discrete locally compact groups. In this paper we study analogs of these results for category algebras (the Borel σ-algebra modulo the ideal of first category sets) of topological groups. Our main results are for the...
Jaroslav Lukeš (1978)
Časopis pro pěstování matematiky
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Czesław Ryll-Nardzewski (1964)
Fundamenta Mathematicae
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Vassilios Gregoriades (2012)
Fundamenta Mathematicae
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We present the effective version of the theorem about turning Borel sets in Polish spaces into clopen sets while preserving the Borel structure of the underlying space. We show that under some conditions the emerging parameters can be chosen in a hyperarithmetical way and using this we obtain some uniformity results.