Mixing Smorodinsky-Adams map [2] with q_n = n^2, is shown to satisfy, with respect to the time-zero partition, the d+ > 1/16 property. Basing on a general theorem from [7], an explicite example of a mixing but not exact quasi-Markovian process is given. The d+ > O property is studied: although defined for a process, it is shown to be a property of the transformation itself. All mixing rank one transformations are shown to possess this property, which strenghtens the result from [3]. Several other transformations are observed not to satisfy this property (von Neumann-Kakutani's map, irrational rotations, Feldman's map). A rank one weakly mixing example with d+ = O is also given.
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We present an example of the map T with Markovian generator Q such that the process (T, Q) is not quasi-Markovian but the natural extension of T to the automorphism is Bernoulli one.
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