Abstract
In this work we consider hypercyclic operators as a special case of Polish dynamical systems. In the first section we analyze a construction due to Bayart and Grivaux of a hypercyclic operator which preserves a Gaussian measure, and derive a description of the maximal spectral type of the Koopman operator associated to the corresponding measure preserving dynamical system. We then use this information to show the existence of a mildly but not strongly mixing hypercyclic operator on Hilbert space. In the last two sections we study hypercyclic and frequently hypercyclic operators which, as Polish dynamical systems, are M-systems, E-systems, and syndetically transitive systems.
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