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Displaying 21 – 37 of 37

Combinatoire des simplexes sans singularités I. Le cas différentiable

Jean Cerf (1998)

Annales de l'institut Fourier

On définit le bicomplexe $C_{•, •}$ , extension naturelle du complexe $C$ engendré par un ensemble simplicial $Γ$ . Ceci permet de définir la notion de ruban de base un cycle de $C$ . La somme directe de l’homologie des colonnes de $C_{•, •}$ contient, outre l’homologie de $C$ , des groupes dans lesquels se trouvent les obstructions à l’existence de rubans. Si $Γ$ est un sous-ensemble simplicial, stable par subdivision, de l’ensemble des simplexes singuliers d’un espace topologique, l’existence de rubans entraîne l’invariance...

Commutators of Diffeomorphisms

John N. Mather (1974)

Commentarii mathematici Helvetici

Commutators of Diffeomorphisms: II.

John N. Mather (1975)

Commentarii mathematici Helvetici

Compact cosymplectic manifolds of positive constant phi-sectional curvature.

Manuel de León, Juan C. Marrero (1994)

Extracta Mathematicae

Completing Lie algebra actions to Lie group actions.

Kamber, Franz W., Michor, Peter W. (2004)

Electronic Research Announcements of the American Mathematical Society [electronic only]

Complex Analytic Realization of Reeb's Foliation of S3.

David E. Barrett (1990)

Mathematische Zeitschrift

Complexifications of Transversely Holomorphic.

A. Haefliger, D. Sundararaman (1985)

Mathematische Annalen

Conformal curvature for the normal bundle of a conformal foliation

Angel Montesinos (1982)

Annales de l'institut Fourier

It is proved that the normal bundle $ℋ$ of a distribution $𝒱$ on a riemannian manifold admits a conformal curvature $C$ if and only if $𝒱$ is a conformal foliation. Then $ℋ$ is conformally flat if and only if $C$ vanishes. Also, the Pontrjagin classes of $ℋ$ can be expressed in terms of $C$ .

Congruences of surfaces in $ℂ^{2}$

Mohamed Afwat (1976)

Časopis pro pěstování matematiky

Connected components of the strata of the moduli spaces of quadratic differentials

Erwan Lanneau (2008)

Annales scientifiques de l'École Normale Supérieure

In two fundamental classical papers, Masur [14] and Veech [21] have independently proved that the Teichmüller geodesic flow acts ergodically on each connected component of each stratum of the moduli space of quadratic differentials. It is therefore interesting to have a classification of the ergodic components. Veech has proved that these strata are not necessarily connected. In a recent work [8], Kontsevich and Zorich have completely classified the components in the particular case where the quadratic...

Constructing taut foliations.

Rachel Roberts (1995)

Commentarii mathematici Helvetici

Constructions de feuilletages

Robert Roussarie (1976/1977)

Séminaire Bourbaki

Contact homology of toroidal manifolds. (Homologie de contact des variétés toroïdales.)

Bourgeois, Frédéric, Colin, Vincent (2005)

Geometry & Topology

Courbure totale des feuilletages des surfaces.

Gilbert Levitt, Rémi Langevin (1982)

Commentarii mathematici Helvetici

Coverings of foliations anf associated C*-algebras.

Moto O'Uchi (1986)

Mathematica Scandinavica

Cycles for the Dynamical Study of Foliated Manifolds and Complex Manifolds.

Dennis Sullivan (1976)

Inventiones mathematicae

Cylindrical real hyper surfaces in $\mathbf{C}^{n}$

Claudio Rea (1981)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

Si stabiliscono due condizioni sufficienti per un germe di ipersuperficie reale di classe $c^{\infty}$ in $\mathbf{C}^{n}$ affinchè esistano coordinate olomorfe rispetto alle quali l'ipersuperficie risulti essere il luogo di zeri di una funzione di $k<n$ variabili e $k$ sia minimale rispetto a questa proprietà. In altre parole si vuole che l'ipersuperficie, a meno di una trasformazione bi-olomorfa, sia l’unione di sottovarietà lineari complesse, parallele di dimensione $n — k$ .

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