论文标题
迭代和正式转型群
Iterations and groups of formal transformations
论文作者
论文摘要
在本文中，我们考虑了正式迭代的问题。我们构建一个保留没有任何平方根的映射区域。这导致了Moser存在定理的插值问题的反例。我们给出形式转换组的示例，以便迭代问题为各组的每个元素都有解决方案。
In this paper, we consider the problem of formal iteration. We construct an area preserving mapping which does not have any square root. This leads to a counterexample to Moser's existence theorem for an interpolation problem. We give examples of formal transformation groups such that the iteration problem has a solution for every element of the groups.
