A separation result for countable unions of Borel rectangles
classification
🧮 math.LO
keywords
countablesigmatimesanalyticbinaryborelcharacterizingdichotomy
read the original abstract
We provide dichotomy results characterizing when two disjoint analytic binary relations can be separated by a countable union of ${\bf\Sigma}^0_1 \!\times\! {\bf\Sigma}^0_\xi$ sets, or by a ${\bf\Pi}^0_1 \!\times\! {\bf\Pi}^0_\xi$ set.
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