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Franc Forstnerič - Non singular holomorphic foliations on Stein manifolds (Part 4)
/ Fanny Bastien
/ Canal-u.fr
Voir le résumé
Voir le résumé
A nonsingular holomorphic foliation of codimension on a complex manifold is locally given by the level sets of a holomorphic submersion to the Euclidean space . If
is a Stein manifold, there also exist plenty of global foliations of
this form, so long as there are no topological obstructions. More
precisely, if then any -tuple of pointwise linearly independent (1,0)-forms can be continuously deformed to a -tuple of differentials where is a holomorphic submersion of to . Such a submersion always exists if is no more than the integer part of . More generally, if is a complex vector subbundle of the tangent bundle such that is a flat bundle, then is homotopic (through complex vector subbundles of ) to an integrable subbundle, i.e., to the tangent bundle of a nonsingular holomorphic foliation on .
I will prove these results and discuss open problems, the most
interesting one of them being related to a conjecture of Bogomolov. Mot(s) clés libre(s) : Grenoble, école d'été, mathématiques, institut fourier, summer school, holomorphic foliations
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Franc Forstnerič - Non singular holomorphic foliations on Stein manifolds (Part 2)
/ Fanny Bastien
/ Canal-u.fr
Voir le résumé
Voir le résumé
A nonsingular holomorphic foliation of codimension on a complex manifold is locally given by the level sets of a holomorphic submersion to the Euclidean space . If
is a Stein manifold, there also exist plenty of global foliations of
this form, so long as there are no topological obstructions. More
precisely, if then any -tuple of pointwise linearly independent (1,0)-forms can be continuously deformed to a -tuple of differentials where is a holomorphic submersion of to . Such a submersion always exists if is no more than the integer part of . More generally, if is a complex vector subbundle of the tangent bundle such that is a flat bundle, then is homotopic (through complex vector subbundles of ) to an integrable subbundle, i.e., to the tangent bundle of a nonsingular holomorphic foliation on .
I will prove these results and discuss open problems, the most
interesting one of them being related to a conjecture of Bogomolov. Mot(s) clés libre(s) : mathématiques, Grenoble, école d'été, courbes, institut fourier, summer school, holomorphic foliations, COURBES PSEUDOHOLOMORPHES
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Franc Forstnerič - Non singular holomorphic foliations on Stein manifolds (Part 1)
/ Fanny Bastien
/ 19-06-2012
/ Canal-u.fr
Forstnerič Franc
Voir le résumé
Voir le résumé
A nonsingular holomorphic foliation of codimension on a complex manifold is locally given by the level sets of a holomorphic submersion to the Euclidean space . If
is a Stein manifold, there also exist plenty of global foliations of
this form, so long as there are no topological obstructions. More
precisely, if then any -tuple of pointwise linearly independent (1,0)-forms can be continuously deformed to a -tuple of differentials where is a holomorphic submersion of to . Such a submersion always exists if is no more than the integer part of . More generally, if is a complex vector subbundle of the tangent bundle such that is a flat bundle, then is homotopic (through complex vector subbundles of ) to an integrable subbundle, i.e., to the tangent bundle of a nonsingular holomorphic foliation on .
I will prove these results and discuss open problems, the most
interesting one of them being related to a conjecture of Bogomolov. Mot(s) clés libre(s) : mathématiques, Grenoble, école d'été, courbes, institut fourier, summer school, feuilletages, holomorphic foliations
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Dominique Cerveau - Holomorphic foliations of codimension one, elementary theory (Part 1)
/ Fanny Bastien
/ 18-06-2012
/ Canal-u.fr
Cerveau Dominique
Voir le résumé
Voir le résumé
In
this introductory course I will present the basic notions, both local
and global, using classical examples. I will explain statements in
connection with the resolution of singularities with for instance the
singular Frobenius Theorem or the Liouvilian integration. I will also
present some open questions which I will motivate by examples.
Dans
ce cours introductif je m’attacherai à présenter les notions de base
tant locales que globales au travers d’exemples classiques. J’aborderai
des énoncés liés à la résolution des singularités avec par exemple le
théorème de Frobenius singulier ou l’intégration Liouvillienne. Je
présenterai aussi quelques problèmes ouverts que je motiverai encore au
travers d’exemples.
Mot(s) clés libre(s) : mathématiques, Grenoble, école d'été, courbes, institut fourier, summer school, feuilletages, holomorphic foliations
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