Courbure scalaire prescrite sur les variétés Riemanniennes compactes dans le cas négatif

Ricci Curvature modulo Homotopy

This article is a report summarizing recent progress in the geometry of negative Ricci and scalar curvature. It describes the range of general existence results of such metrics on manifolds of dimension ≥ 3. Moreover it explains flexibility and approximation theorems for these curvature conditions leading to unexpected effects. For instance, we find that “modulo homotopy” (in a specified sense)...

Invariants de Vassiliev pour les entrelacs dans S³ et dans les variétés de dimension trois

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Nonlinear Schrödinger Equation on Four - Dimensional Compact Manifolds

— We prove two new results about the Cauchy problem in the energy space for nonlinear Schrödinger equations on four-dimensional compact manifolds. The first one concerns global well-posedness for Hartree-type nonlinearities and includes approximations of cubic NLS on the sphere as a particular case. The second one provides, in the case of zonal data on the sphere, local well-posedness for quadr...

Essai d'adsorption du virus vaccinal sur le gel d'aluminü et la -possibilité de son utilisation dans les vaccins associés

La fiabilité des informations sur le web: le cas Wikipédia

Online IR tools have to take into account new phenomena linked to the appearance of blogs, wiki and other collaborative publications. Among these collaborative sites, Wikipedia represents a crucial source of information. However, the quality of this information has been recently questionned. A better knowledge of the contributors’ behaviors should help users navigate through information whose q...