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首页> 外文期刊>Proceedings of the London Mathematical Society >Real extensions of distal minimal flows and continuous topological ergodic decompositions
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Real extensions of distal minimal flows and continuous topological ergodic decompositions

机译:远端最小流量和连续遍历遍历分解的实际扩展

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摘要

We prove a structure theorem for topologically recurrent real skew product extensions of distal minimal compact metric flows with a compactly generated Abelian acting group (for example, Z~d-flows and R~d-flows). The main result states that every such extension apart from a coboundary can be represented by a perturbation of a so-called Rokhlin skew product. We obtain as a corollary that the topological ergodic decomposition of the skew product extension into prolongations is continuous and compact with respect to the Fell topology on the hyperspace. The right translation acts minimally on this decomposition, therefore providing a minimal compact metric analogue to the Mackey action. This topological Mackey action is a distal (possibly trivial) extension of a weakly mixing factor (possibly trivial), and it is distal if and only if perturbation of the Rokhlin skew product is defined by a topological coboundary.
机译:我们证明了具有紧凑生成的Abelian作用组(例如Z〜d流和R〜d流)的远端最小紧度量流的拓扑递归实际偏乘积扩展的结构定理。主要结果表明,除共界以外的所有此类扩展都可以用所谓的Rokhlin偏积的扰动来表示。作为推论,相对于超空间上的Fell拓扑,偏积扩展到延长的拓扑遍历分解是连续且紧凑的。正确的翻译对分解的影响最小,因此提供了与Mackey动作相似的最小紧凑度量。这种拓扑Mackey作用是弱混合因子(可能是琐碎的)的远端(可能是微不足道的)扩展,并且当且仅当Rokhlin偏积的扰动由拓扑共界定义时才是远端的。

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