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Markov intertwining operators, joinings, and asymptotic properties of dynamical systems

This text is written based on the author's publications during the period from 1991 to 2001. The work is devoted to the theory of Markov intertwining operators and joinings of measure-preserving group actions, as well as to their applications to study asymptotic properties of dynamical systems. Special attention is paid to Rokhlin's problems on multiple mixing and multiple spectrum. The development of these topics over the past twenty years has not been discussed. In fact many results on joinings have frozen in time, many questions have remained open without losing their relevance, but probably have ceased to excite interest due to difficulties. For example, it is not known whether the minimal self-joinings of order 2 imply all orders? Is there a non-trivial pairwise independent joining for a weakly mixing system of zero entropy? What can be said about such joinings for transformations with small local rank? These questions are ripe for a long time, and the author reminds the reader about them, combining his story with numerous partial and related results.