# Recent and upcoming talks by Marcos Cramer

## Bonn Logic Seminar

12 January, Thursday 14.15-15.45, Mathematical institute, University of Bonn, room 0.011 Benjamin Miller (Universität Münster): Local rigidity, Glimm-Effros embeddings, and definable cardinals Abstract: We employ local rigidity properties of the usual action of GL_2(Z) on the torus to rule out analogs of the Glimm-Effros dichotomy for non-measure-hyperfinite equivalence relations. continue reading…