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Publicacions matemàtiques Encontrados 14 registros  La búsqueda tardó 0.00 segundos. 
1.
16 p, 449.7 KB Groupoïde d'homotopie d'un feuilletage riemannien et réalisation symplectique de certaines variétés de poisson / Alcalde Cuesta, Fernando
The purpose of this paper is to prove the existence of a symplectic realization for a large classe of regular Poisson manifolds with riemannian two dimensional characteristic foliation. To do so, we will show that the homotopy groupoid of a riemannian foliation is locally trivial.
1989 - 10.5565/PUBLMAT_33389_01
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 395-410  
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2.
5 p, 119.4 KB Sur l'intégration symplectique de la structure de poisson singuliére Λ = (x2 + y2) ∂/∂x Λ ∂/∂y de R2 / Alcalde Cuesta, Fernando ; Dazord, Pierre ; Hector, Gilbert
The purpose of this note is to give an example of a singular Poisson structure on R2 which admits a symplectic realization by a Lie groupoid.
1989 - 10.5565/PUBLMAT_33389_02
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 411-415  
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3.
6 p, 137.4 KB Groupoïdes riemanniens / Gallego Gómez, Eduardo (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Gualandri, L. (Università di Bologna. Dipartimento di Matematica) ; Rector, G. (Université Claude Bernard-Lyon I. Département de Mathematiques) ; Reventós, Agustí (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We propose a definition of a riemannian groupoid, and we show that the Stefan foliation that it induces is a riemannian (singular) foliation. We also prove that the homotopy groupoid of a riemannian (regular) foliation is a riemannian groupoid.
1989 - 10.5565/PUBLMAT_33389_03
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 417-422  
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4.
8 p, 194.8 KB Lemme de moser feuilleté et classification des variétés de poisson réguliéres / Hector, Gilbert ; Macías-Virgós, Enrique ; Saralegi, M.
Regular Poisson structures with fixed characteristic foliation F are described by means of foliated symplectic forms. Associated to each of these structures, there is a class in the second group of foliated cohomology H2 (F). [...]
1989 - 10.5565/PUBLMAT_33389_04
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 423-430  
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5.
13 p, 350.6 KB Groupoïde fondamental et d'holonomie de certains feuilletages réguliers / Lasso de la Vega Martínez, Casilda (Universidad del País Vasco)
Let M be a manifold with a regular foliation F. We recall the construction of the fundamental groupoid and the homotopy groupoid associated to. F. We describe some interesting particular cases and give some gluing techniques. [...]
1989 - 10.5565/PUBLMAT_33389_05
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 431-443  
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6.
13 p, 362.7 KB La conjecture de Baum-Connes pour un feuilletage sans holonomie de codimension un sur une variété fermée / Macho Stadler, Marta
In [C2], Baum-Connes state a conjecture for the K-theory of C* algebras of foliations . This conjecture has been proved by T . Natsume [N2] for C∞ -codimension one foliations without holonomy on a closed manifold. [...]
1989 - 10.5565/PUBLMAT_33389_06
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 445-457  
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7.
22 p, 679.8 KB Leaves of Markov local minimal sets in foliations of codimension one / Cantwell, John ; Lawrence, Conlon
The authors continue their study of exceptional local minimal sets with holonomy modeled on symbolic dynamics (called Markov LMS [C- C 1]). Here, an unpublished theorem of G. Duminy, on the topology of semiproper exceptional leaves, is extended to every leaf, semiproper or not, of a Markov LMS. [...]
1989 - 10.5565/PUBLMAT_33389_07
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 461-484  
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8.
16 p, 508.7 KB Deformations des feuilletages transversalement holomorphes a type differentiable fixe / El Kacimi, Aziz (Université de Valenciennes) ; Nicolau i Reig, Marcel (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
Let F be a transversely holomorphic foliation on a compact manifold. We show the existence of a versal space for those deformations of F which keep fixed its differentiable type if F is hermitian or if F has complex codimension one and admits a transverse projectable connection. [...]
1989 - 10.5565/PUBLMAT_33389_08
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 485-500  
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9.
15 p, 444.3 KB Unfoldings of holomorphic foliations / Gómez-Mont, Xavier
The objective of this paper is to give a criterium for an unfolding of a holomorphic foliation with singularities to be holomorphically trivial.
1989 - 10.5565/PUBLMAT_33389_09
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 501-515  
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10.
15 p, 366.2 KB Some remarks on Lie flows / Llabrés Florit, Miquel (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Reventós, Agustí (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
The first part of this paper is concerned with geometrical and cohomological properties of Lie flows on compact manifolds. Relations between these properties and the Euler class of the flow are given. [...]
1989 - 10.5565/PUBLMAT_33389_10
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 517-531  
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11.
9 p, 315.4 KB Dualite symplectique, feuilletages et geometrie du moment / Molino, P.
One gives the linlcs between th notions of singular foliations, Γ-structures and momentum mapping in the context of symplectic geometry.
1989 - 10.5565/PUBLMAT_33389_11
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 533-541  
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12.
12 p, 316.0 KB Differential forms, Weitzenböck formulae and foliations / Rummler, Hansklaus
The Weitzenböck formulae express the Laplacian of a differential form on an oriented Riemannian manifold in local coordinates, using the covariant derivatives of the form and the coefficients of the curvature tensor. [...]
1989 - 10.5565/PUBLMAT_33389_12
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 543-554  
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13.
3 p, 90.3 KB An elementary proof of a Lima's theorem for surfaces / Turiel, F. J.
An elementary proof of the following theorem is given: THEOREM. Let M be a compact connected surface without boundary. Consider a C∞ action of Rn on M. Then, if the Euler-Poincaré characteristic of M is not zero there exits a fixed point.
1989 - 10.5565/PUBLMAT_33389_13
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 555-557  
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14.
17 p, 504.2 KB Basics of lagrangian foliations / Vaisman, I.
The paper is an exposition of basic known local and global results on Lagrangian foliations such as the theorems of Darboux-Lie, Weinstein, Arnold-Liouville, a global characterization of cotangent bundles, higher order Maslov classes, etc.
1989 - 10.5565/PUBLMAT_33389_14
Publicacions matemàtiques, V. 33 n. 3 (1989) p. 559-575  
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