Around King's Rank-One theorems: Flows and Zn-actions

Abstract

We study the generalizations of Jonathan King's rank-one theorems (Weak-Closure Theorem and rigidity of factors) to the case of rank-one R-actions (flows) and rank-one Zn-actions. We prove that these results remain valid in the case of rank-one flows. In the case of rank-one Zn actions, where counterexamples have already been given, we prove partial Weak-Closure Theorem and partial rigidity of factors.

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