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Wednesday, April 27, 2022
12:00 PM - 1:00 PM
Online Event

Logic Seminar

Revisiting the Erdős-Rado canonical partition theorem
Lionel Nguyen Van Thé, Institut de Mathématiques de Marseille, Université d'Aix-Marseille,

One of the numerous strengthenings of Ramsey's theorem is due to Erdős and Rado, who analyzed what partition properties can be obtained on mm-subsets of the naturals when colorings are not necessarily finite. Large monochromatic sets may not appear in that case, but there is a finite list of behaviors, called "canonical", to which every coloring reduces. The purpose of this talk will be to remind certain not so well-known analogous theorems of the same flavor that were obtained by Prömel in the eighties for various classes of structures (like graphs or hypergraphs), and to show how such theorems can in fact be deduced in the more general setting of Fraïssé classes.

For more information, please contact Math Dept. by phone at 626-395-4335 or by email at A. Kechris at kechris@caltech.edu.