Speaker: Professor Valentin Ya. Golodets, UNSW

Place: Red Centre, room 4082.
Date: the 6th of September.
Time: 12:00 -- 13:00.

Abstract:


The cost of an equivalence relation is an important numerical invariant in
ergodic theory introduced recently by H.Levitt. It allowed to discover some
new properties of Borel actions of non-amenable countable groups preserving
a finite measure. A theory of the costs were developed recently by Gaboriau,
Hjorth, Kechris, Miller and other authors.