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Louveau's theorem for the descriptive set theory of internal sets

Published online by Cambridge University Press:  12 March 2014

Kenneth Schilling  and
Boško Živaljević
Kenneth Schilling
Affiliation:
Department of Mathematics, University of Michigan—Flint, Flint, MI 48502-2186, USA, E-mail: [email protected]
Boško Živaljević
Affiliation:
Department of Computer Science, The University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA Process Management, Computer Technology, International Paper Company, 3101 International Drive East, Mobile, AL 36606, USA, E-mail: [email protected]
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Abstract

We give positive answers to two open questions from [15]. (1) For every set C countably determined over , if C is then it must be over , and (2) every Borel subset of the product of two internal sets X and Y all of whose vertical sections are can be represented as an intersection (union) of Borel sets with vertical sections of lower Borel rank. We in fact show that (2) is a consequence of the analogous result in the case when X is a measurable space and Y a complete separable metric space (Polish space) which was proved by A. Louveau and that (1) is equivalent to the property shared by the inverse standard part map in Polish spaces of preserving almost all levels of the Borel hierarchy.

Type
Research Article
Information
The Journal of Symbolic Logic , Volume 62 , Issue 2 , June 1997 , pp. 595 - 607
Copyright
Copyright © Association for Symbolic Logic 1997

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References

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