Logic Seminar

SEMINAR WILL BE HELD IN 159 SLOAN

This work is part of a project to understand the complexity of the equivalence relation of isomorphism of minimal flows of countable groups (and, more specifically, minimal subshifts) in the framework of Borel reducibility. We have two results concerning Toeplitz subshifts: one on the complexity of isomorphism of Z-Toeplitz subshifts with separated holes and one where the acting group is non-amenable (and residually finite). Those results only scratch the surface of the general problem and many interesting open questions remain. This is joint work with Marcin Sabok.