Modules formels locaux de feuilletages holomorphes

Details Modules formels locaux de feuilletages holomorphes Modules formels locaux de feuilletages holomorphes

2004-02-16

arxiv.org/abs/math/0402256v1

Mathematics

Dynamical Systems

89 pages, french

Scientific paper

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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