UBC Ergodic Theory and Dynamical Systems Seminar: Yinon Spinka

In the late 70s, in a series of three seminal papers, Keane and Smorodinsky proved a finitary version of the Ornstein isomorphism theorem, first for Bernoulli schemes and then for Markov shifts. For Markov chains over a countable state space, the result was obtained several years later by Rudolph, through a rather complicated characterization of finitarily Bernoulli processes. We present a simpler and more direct proof of this result.