Abstract

In an attempt to further classifyK-automorphism D. Ornstein suggested (orally) a stronger mixing property calledweak Bernoulli (together with N. Friedman he proved that if a generator has this property then the transformation is isomorphic to a Bernoulli shift). I show that in a Bernoulli shift there is a partition which is not weak Bernoulli. I use the following theorem: The shift on a regular stationary Gaussian process is isomorphic to a Bernoulli shift.

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