Hurewicz-like tests for Borel subsets of the plane
classification
🧮 math.LO
math.GN
keywords
bormxiborelhurewicz-likeplanepotentiallysetssubsetscalled
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Let xi be a non-null countable ordinal. We study the Borel subsets of the plane that can be made $\bormxi$ by refining the Polish topology on the real line. These sets are called potentially $\bormxi$. We give a Hurewicz-like test to recognize potentially $\bormxi$ sets.
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