# Topologies on countable models

#### by Greg Hjorth

Institution: Mathematics and Statistics Dept, The University of Melbourne
Date: Thu 13th August 2009
Time: 4:15 PM
Location: Room 107, Richard Berry Building, The University of Melbourne

Abstract: Given a countable language L, there are two natural topologies one can place on the space of all L structures on the natural numbers. I will survey some results about the possible Borel complexity of an isomorphism type