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arXiv math/0402256math.DSmath.CV
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模形成局部全同态

Modules formels locaux de feuilletages holomorphes

Jean-Francois Mattei, Eliane Salem

摘要:

我们给出了一个完整的列表的形式不变量的一个大类的形式微分1-形式$\w \in \Bbb C [[ x, y]]dx + \Bbb C [[ x, y]]dy$。\indent-等奇异变形(英语:Equisingular deformation)是一种等约变形,它使得例外因子的分量的局部形式类型和完整表示都保持不变。我们刻画了具有有限形式类型(t.f.f)的1-形式,即允许半泛$\hat{SL}$ -等奇异变形的1-形式,并给出了有限性的一个显式组合判据. \indent具有有限形式类型的1-形式的集合包含第二类1-形式的集合中的稠密开集(在Krull拓扑的意义下)。

英文摘要:

We give a complete list of formal invariants for a large class of formal differential 1-forms $\w \in \Bbb C [[ x, y]]dx + \Bbb C [[ x, y]]dy$. \indent A $\hat{SL}$-equisingular deformation is an equireducible deformation which leaves invariant both the local formal types and the holonomy representation of the components of the exceptional divisor. We characterize the 1-forms with finite formal type (t.f.f), i.e. those which admit a semi-universal $\hat{SL}$-equisingular deformation, and we give an explicit combinatorial criterion of finiteness. \indent The set of 1-forms with finite formal type contains a dense open set (in the sense of Krull's topology)in the set of 1-forms of the second kind.

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