Tuesday October 18, 16.30
Mathematical Institute, University of Bonn, room 0.003
Dominique Lecomte (University of Paris 6): Baire class xi colorings
The G_0-dichotomy due to Kechris, Solecki and Todorcevic characterizes the analytic relations having a Borel measurable countable coloring. Our goal is to find a version of the G_0-dichotomy for xi-measurable countable colorings. We give a positive solution for the first three levels, as well as some recent progress for the general case.