Veech 1969型区间交换变换的极小性和唯一遍历性
Minimality and unique ergodicity of Veech 1969 type interval exchange transformations
摘要：
我们给出了极小的条件$\mathbb Z/N\mathbb Z$扩张的旋转角$α$与一个标记点，解决问题的任何总理$N$：对于$N=2$，这些对应于Veech 1969年的例子，其中的充要条件是未知的。我们还提供了一个词组合准则的极小有效的一般区间交换变换，它适用于$\mathbb Z/N\mathbb Z$扩展的任何区间交换变换与任何数量的标记点。当初始区间交换变换是线性常返的且存在一个或两个标记点时，给出了这类扩张唯一遍历的条件。
英文摘要：
We give conditions for minimality of $\mathbb Z/N\mathbb Z$ extensions of a rotation of angle $α$ with one marked point, solving the problem for any prime $N$: for $N=2$, these correspond to the Veech 1969 examples, for which a necessary and sufficient condition was not known yet. We provide also a word combinatorial criterion of minimality valid for general interval exchange transformations, which applies to $\mathbb Z/N\mathbb Z$ extensions of any interval exchange transformation with any number of marked points. Then we give a condition for unique ergodicity of these extensions when the initial interval exchange transformation is linearly recurrent and there are one or two marked points.
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