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Results tagged with descriptive-set-theory
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user 50614
Descriptive Set Theory is the study of definable subsets of Polish spaces, where definable is taken to mean from the Borel or projective hierarchies. Other topics include infinite games and determinacy, definable equivalence relations and Borel reductions between them, Polish groups, and effective descriptive set theory.
13
votes
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Is there a Borel subset of $ \mathbb{R}^{2} $, with finite vertical cross-sections, whose pr...
This question is related to another one that I asked two days ago.
Question. Does there exist a Borel subset $ M $ of $ \mathbb{R}^{2} $ with
the following two properties?
The projecti …
- 1,396