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Incompressibilité des feuilles de germes de feuilletages holomorphes singuliers

David Marín, Jean-François Mattei (2008)

Annales scientifiques de l'École Normale Supérieure

Nous considérons un germe de feuilletage holomorphe singulier non-dicritique ℱ défini sur une boule fermée 𝔹 ¯ ⊂ ℂ 2 , satisfaisant des hypothèses génériques, de courbe de séparatrice S . Nous démontrons l’existence d’un voisinage ouvert U de S dans 𝔹 ¯ tel que, pour toute feuille L de ℱ | ( U ∖ S ) , l’inclusion naturelle ı : L ↪ U ∖ S induit un monomorphisme ı * : π 1 ( L ) ↪ π 1 ( U ∖ S ) au niveau du groupe fondamental. Pour cela, nous introduisons la notion géométrique de « connexité feuilletée » avec laquelle nous réinterprétons la notion d’incompressibilité....

Indices of 1-forms and Newton polyhedra.

Alexander Esterov (2005)

Revista Matemática Complutense

A formula of Matsuo Oka (1990) expresses the Milnor number of a germ of a complex analytic map with a generic principal part in terms of the Newton polyhedra of the components of the map. In this paper this formula is generalized to the case of the index of a 1-form on a local complete intersection singularity (Theorem 1.10, Corollaries 1.11, 4.1). In particular, the Newton polyhedron of a 1-form is defined (Definition 1.6). This also simplifies the Oka formula in some particular cases (Propositions...

Integrable analytic vector fields with a nilpotent linear part

Xianghong Gong (1995)

Annales de l'institut Fourier

We study the normalization of analytic vector fields with a nilpotent linear part. We prove that such an analytic vector field can be transformed into a certain form by convergent transformations when it has a non-singular formal integral. We then prove that there are smoothly linearizable parabolic analytic transformations which cannot be embedded into the flows of any analytic vector fields with a nilpotent linear part.

Integral representations for solutions of exponential Gauß-Manin systems

Marco Hien, Céline Roucairol (2008)

Bulletin de la Société Mathématique de France

Let f , g : U → 𝔸 1 be two regular functions from the smooth affine complex variety U to the affine line. The associated exponential Gauß-Manin systems on the affine line are defined to be the cohomology sheaves of the direct image of the exponential differential system 𝒪 U e g with respect to f . We prove that its holomorphic solutions admit representations in terms of period integrals over topological chains with possibly closed support and with rapid decay condition.

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