First we get a sufficient and necessary condition of zero entropy. Next, as application, we study the character of tree map whose periodic points form a closed set.
作为应用，又讨论了周期点是闭集的树映射的特征，以及混沌集与不变测度的关系。
参考来源 - 树映射若干动力性质研究及一类概周期微分方程概周期解的存在性·2,447,543篇论文数据，部分数据来源于NoteExpress
N a set that includes all the values obtained by application of a given operation to its members 闭集 [maths]
You define a named, closed set of values.
您可以先定义一个指定的、封闭的值集合。
A closed set of the interior ballistic equations is established under some assumptions.
在某些假设条件下建立起一组封闭的内弹道方程系。
So rather than having a closed set of capabilities or just an individual product, rather, we can add new capabilities.
所以，我们并不是拥有一个封闭的功能集合或者一个单独的产品，而是能够向其中添加新的功能。
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