Dendrite Flows

Dendrite Flows
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DOI:
10.1007/s12346-017-0237-0
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发表时间:
2017
影响因子:
1.4
通讯作者:
Aymen Haj Salem;H. Hattab
Aymen Haj Salem;H. Hattab
中科院分区:
数学4区
文献类型:
--
作者:
Aymen Haj Salem;H. Hattab

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设(G,D)是一个流,使得D是一个枝晶,G是一个单生成群.用E(D)表示D的端点集。本文证明了若E(D)是闭可数的,则下列性质等价:(1)(G,D)是点态周期的;(2)(G,D)是点态概周期的;(3)轨道闭包关系是闭的;(4)(G,D)是等度连续的.此外,我们还证明了若E(D)是可数的,则(G,D)不是极小流.我们还证明了,如果(G,D)是一个逐点周期流,如果D不包含任何同胚副本的特殊枝晶,则G的作用可以通过一个有限群作用因子。
Let (G,D) be a flow such thatDis a dendrite andGis a finitely generated group. Denote byE(D) the set of endpoints ofD. In this paper, it is shown that ifE(D) is closed and countable then the following properties are equivalent:(1)(G,D) is pointwise periodic;(2)(G,D) is pointwise almost periodic;(3)The orbit closure relation is closed;(4)(G,D) is equicontinuous.In addition, we show that ifE(D) is countable, then (G,D) is not a minimal flow. We also show that if (G,D) is a pointwise periodic flow and ifDdoes not contain any homeomorphic copy of special dendrites, then the action ofGcan factor through a finite group action.