Feuilletages de : de l’holonomie hyperbolique pour les minimaux exceptionnels
Feuilletages holomorphes de codimension un sur les espaces homogènes complexes
Feuilletages holomorphes singuliers sur les surfaces contenant une coquille sphérique globale
En résumé, on retiendra que seules les surfaces d’Inoue-Hirzebruch et les surfaces génériques admettent un feuilletage holomorphe. Sur les surfaces d’Inoue-Hirzebruch il existe exactement deux feuilletages et sur les surfaces génériques au plus un. Le lieu singulier de la réunion des courbes rationnelles coïncide avec le lieu singulier du feuilletage. Les courbes rationnelles sont des feuilles en dehors des points singuliers du feuilletage.
Feuilletages holomorphes singuliers sur les surfaces contenant une coquille sphérique globale
Feuilletages holomorphes sur les surfaces complexes compactes
Feuilletages singuliers de codimension un, groupoïde de Galois et intégrales premières
Dans cet article, nous étudions le groupoïde de Galois d’un germe de feuilletage holomorphe de codimension un. Nous associons à ce -groupoïde de Lie un invariant biméromorphe : le rang transverse. Nous étudions en détails les relations entre cet invariant, l’existence de suites de Godbillon-Vey particulières et l’existence d’une intégrale première dans une extension fortement normale du corps différentiel des germes de fonctions méromorphes. Nous obtenons ainsi une généralisation d’un théorème...
Finite determinacy of dicritical singularities in
For germs of singularities of holomorphic foliations in which are regular after one blowing-up we show that there exists a functional analytic invariant (the transverse structure to the exceptional divisor) and a finite number of numerical parameters that allow us to decide whether two such singularities are analytically equivalent. As a result we prove a formal-analytic rigidity theorem for this kind of singularities.
Foliations by curves with curves as singularities
Let be a holomorphic one-dimensional foliation on such that the components of its singular locus are curves and points . We determine the number of , counted with multiplicities, in terms of invariants of and , assuming that is special along the . Allowing just one nonzero dimensional component on , we also prove results on when the foliation happens to be determined by its singular locus.
Foliations in algebraic surfaces having a rational first integral.
Given a foliation F in an algebraic surface having a rational first integral a genus formula for the general solution is obtained. In the case S = P2 some new counter-examples to the classic formulation of the Poincaré problem are presented. If S is a rational surface and F has singularities of type (1, 1) or (1,-1) we prove that the general solution is a non-singular curve.
Foliations on the complex projective plane with many parabolic leaves
We prove that a foliation on with hyperbolic singularities and with “many" parabolic leaves (i.e. leaves without Green functions) is in fact a linear foliation. This is done in two steps: first we prove that there exists an algebraic leaf, using the technique of harmonic measures, then we show that the holonomy of this leaf is linearizable, from which the result follows easily.
Foliations with complex leaves
Let be a smooth foliation with complex leaves and let be the sheaf of germs of smooth functions, holomorphic along the leaves. We study the ringed space . In particular we concentrate on the following two themes: function theory for the algebra and cohomology with values in .
Foliazioni di Monge-Ampère e classificazione olomorfa
Si illustrano alcuni sviluppi della teoria delle foliazioni di Monge-Ampère e delle sue applicazioni alla classificazione delle varietà complesse non compatte.
Formules pour la multiplicité et le nombre de Milnor d’un feuilletage sur
Frontière d'une hypersurface pfaffienne