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A counterexample to the generalized Banach theorem


Author: Włodzimierz Bzyl
Journal: Proc. Amer. Math. Soc. 89 (1983), 145-146
MSC: Primary 54H05; Secondary 03E35, 04A15
DOI: https://doi.org/10.1090/S0002-9939-1983-0706529-0
MathSciNet review: 706529
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Abstract: We show that it is consistent that the family of Borel maps of class 2 differs from the family of pointwise limits of Borel maps of class 1. This gives an answer to a question raised by W. G. Fleissner.


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DOI: https://doi.org/10.1090/S0002-9939-1983-0706529-0
Article copyright: © Copyright 1983 American Mathematical Society

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