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arXiv 1111.1327math.DG
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奇异叶理和本质各向同性的完整覆盖的光滑性

Smoothness of holonomy covers for singular foliations and essential isotropy

Iakovos Androulidakis, Marco Zambon

摘要:

给定一个奇异的叶理,我们附加一个“本质各向同性”的组,它的每一个叶子,并表明其离散性是一个自然的李代数体的可积性障碍的叶子。我们证明了一个条件,确保离散性是局部满射的横向指数映射的极大理想的向量场规定是切的叶理。基本各向同性组也被证明控制的光滑度的holonomy覆盖的叶(相关纤维的holonomy广群),以及{光滑度}的相关各向同性组。也就是说,本质各向同性群的(拓扑)封闭性是完整覆盖是光滑(有限维)流形和各向同性群是李群的充要条件。这些结果有助于理解围绕紧密叶的奇异叶理的正规形。在这篇文章的最后,我们简要概述了我们的工作,这个正常的形式,将在随后的文件。

英文摘要:

Given a singular foliation, we attach an "essential isotropy" group to each of its leaves, and show that its discreteness is the integrability obstruction of a natural Lie algebroid over the leaf. We show that a condition ensuring discreteness is the local surjectivity of a transversal exponential map associated with the maximal ideal of vector fields prescribed to be tangent to the foliation. The essential isotropy group is also shown to control the smoothness of the holonomy cover of the leaf (the associated fiber of the holonomy groupoid), as well as the {smoothness} of the associated isotropy group. Namely, the (topological) closeness of the essential isotropy group is a necessary and sufficient condition for the holonomy cover to be a smooth (finite-dimensional) manifold and the isotropy group to be a Lie group. These results are useful towards understanding the normal form of a singular foliation around a compact leaf. At the end of this article we briefly outline work of ours on this normal form, to be presented in a subsequent paper.

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