Konstantin Slutsky : Topological Similarity Classes in the Groups of Automorphisms of Some Randomly Ordered Fraisse Limits.

Posted by , part of the Logic Seminar.

At

March 16, 2010, 4 p.m.

In

SEO 612

Abstract

One of the reasons for the interest in Fraisse classes is the richness of the groups of automorphisms of their limits. We shall discuss groups of automorphisms of the limits of certain linearly ordered Fraisse classes and show that all topological similarity classes in them are meager. Examples will include: groups of automorphism of the rationals (as a linear ordering), of the randomly ordered random graph, and of the randomly ordered Urysohn space. The talk will be based on a joint work with Christian Rosendal.

seminar begins with tea.