arXiv · 1406.7544
We construct, for each countable ordinal $ξ$, a closed graph with Borel chromatic number two and Baire class $ξ$ chromatic number $\aleph\_0$.
Dominique Lecomte, Miroslav Zeleny. 2014-12-14. Borel chromatic number of closed graphs. https://arxiv.org/abs/1406.7544
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