Keisler's order is not simple

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• Maryanthe Malliaris (Chicago)
• Thursday 26 May 2022, 14:30-15:30
• CMS MR5.

If you have a question about this talk, please contact ibl10.

The ultraproduct construction gives a way of averaging an infinite sequence of mathematical structures, such as fields, graphs, or linear orders. The talk will be about the strength of such a construction, aiming to motivate and explain a theorem of Malliaris and Shelah which says that Keisler’s order, long thought to have finitely many classes (perhaps five or six), in fact has continuum many.

This talk is part of the Combinatorics Seminar series.

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