Borel chromatic number of closed graphs
Volume 234 / 2016
Fundamenta Mathematicae 234 (2016), 163-169
MSC: Primary 03E15; Secondary 54H05.
DOI: 10.4064/fm152-11-2015
Published online: 29 February 2016
Abstract
We construct, for each countable ordinal $\xi $, a closed graph with Borel chromatic number 2 and Baire class $\xi $ chromatic number $\aleph _0$.
