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An antibasis result for graphs of infinite Borel chromatic number

2014
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Proceedings of the American Mathematical Society
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We answer in the negative a question posed by Kechris-Solecki-Todorcevic as to whether the shift graph on Baire space is minimal among graphs of indecomposably infinite Borel chromatic number. To do so, we use ergodic-theoretic techniques to construct a new graph amalgamating various properties of the shift actions of free groups. The resulting graph is incomparable with any graph induced by a function. We then generalize this construction and collect some of its useful properties. 2010

doi:10.1090/s0002-9939-2014-11918-6
fatcat:dxh77lcrd5gelacraxl5e5cf6e