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Dégénerescence locale des transformations conformes pseudo-riemanniennes

Charles Frances (2012)

Annales de l’institut Fourier

Nous étudions l’ensemble Conf ( M , N ) des immersions conformes entre deux variétés pseudo-riemanniennes ( M , g ) et ( N , h ) . Nous caractérisons notamment l’adhérence de Conf ( M , N ) dans l’espace des applications continues 𝒞 0 ( M , N ) , et décrivons quelques propriétés géométriques de ( M , g ) lorsque cette adhérence est non triviale.

Differential geometry of Cartan domains of type four

Chiara De Fabritiis (1990)

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

In this note we compute the sectional curvature for the Bergman metric of the Cartan domain of type IV and we give a classification of complex totally geodesic manifolds for this metric.

Dirac and Plateau billiards in domains with corners

Misha Gromov (2014)

Open Mathematics

Groping our way toward a theory of singular spaces with positive scalar curvatures we look at the Dirac operator and a generalized Plateau problem in Riemannian manifolds with corners. Using these, we prove that the set of C 2-smooth Riemannian metrics g on a smooth manifold X, such that scalg(x) ≥ κ(x), is closed under C 0-limits of Riemannian metrics for all continuous functions κ on X. Apart from that our progress is limited but we formulate many conjectures. All along, we emphasize geometry,...

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