Baire class one colorings and a dichotomy for countable unions of $F_\sigma$ rectangles
Résumé
We study the Baire class one countable colorings, i.e., the countable partitions into $F_\sigma$ sets. Such a partition gives a covering of the diagonal into countably many $F_\sigma$ squares. This leads to the study of countable unions of $F_\sigma$ rectangles. We give a Hurewicz-like dichotomy for such countable unions.
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