Abstract
The purpose of this work is to study the joinings of simple systems. First the joinings of a simple system with another ergodic system are treated; then the pairwise independent joinings of three systems one of which is simple. The main results obtained are: (1) A weakly mixing simple system with no non-trivial factors with absolutely continuous spectral type is simple of all orders. (2) A weakly mixing system simple of order 3 is simple of all orders.
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Glasner, E., Host, B. & Rudolph, D. Simple systems and their higher order self-joinings. Israel J. Math. 78, 131–142 (1992). https://doi.org/10.1007/BF02801575
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DOI: https://doi.org/10.1007/BF02801575