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Nombre de programmes trouvés : 750
Conférences

le (1h30m46s)

La démocratie des crédules (IAP)

Conférence de l'Institut d'Astrophysique de Paris présentée par Gérald Bronner, professeur de Sociologie Université Paris-Diderot (Paris 7) le 1er avril 2014.Pourquoi les mythes du complot envahissent-ils l'esprit de nos contemporains ? Pourquoi se méfie-t-on toujours des hommes de sciences ? Comment, d'une façon générale, des faits imaginaires ou inventés, voire franchement mensongers, arrivent-ils à se diffuser, à emporter l'adhésion des publics, à infléchir les décisions des politiques, en bref, à façonner une partie du monde dans lequel nous vivons ? N'était-il pourtant pas raisonnable d'espérer qu'avec ...
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Cours magistraux

le (1h30m40s)

Feng Luo - An introduction to discrete conformal geometry of polyhedral surfaces (Part 4)

The goal of the course is to introduce some of the recent developments on discrete conformal geometry of polyhedral surfaces. We plan to cover the following topics.- The Andreev-Koebe-Thurston theorem on circle packing polyhedral metrics and Marden-Rodin’s proof- Thurston’s conjecture on the convergence of circle packings to the Riemann mapping and its solution by Rodin-Sullivan- Finite dimensional variational principles associated to polyhedral surfaces- A discrete conformal equivalence of polyhedral surfaces and its relationship to convex polyhedra in hyperbolic 3-space- A discrete uniformization theorem for compact polyhedral surfaces- Convergence of discrete conformality and some open problems
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Cours magistraux

le (1h30m6s)

Yoshihiro Tonegawa - Analysis on the mean curvature flow and the reaction-diffusion approximation (Part 2)

The course covers two separate but closely related topics. The first topic is the mean curvature flow in the framework of GMT due to Brakke. It is a flow of varifold moving by the generalized mean curvature. Starting from a quick review on the necessary tools and facts from GMT and the definition of the Brakke mean curvature flow, I will give an overview on the proof of the local regularity theorem. The second topic is the reaction-diffusion approximation of phase boundaries with key words such as the Modica-Mortola functional and ...
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Cours magistraux

le (1h29m42s)

Gilles Courtois - The Margulis lemma, old and new (Part 4)

The Margulis lemma describes the structure of the group generated by small loops in the fundamental group of a Riemannian manifold, thus giving a picture of its local topology. Originally stated for homogeneous spaces by C. Jordan, L. Bieberbach, H. J. Zassenhaus, D. Kazhdan-G. Margulis, it has been extended to the Riemannian setting by G. Margulis for manifolds of non positive curvature. The goal of these lectures is to present the recent work of  V. Kapovitch and B. Wilking who gave a sharp version of the Margulis lemma under the assumption that the Ricci curvature is bounded below. Their method ...
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Cours magistraux

le (1h29m18s)

Gilles Courtois - The Margulis lemma, old and new (Part 5)

The Margulis lemma describes the structure of the group generated by small loops in the fundamental group of a Riemannian manifold, thus giving a picture of its local topology. Originally stated for homogeneous spaces by C. Jordan, L. Bieberbach, H. J. Zassenhaus, D. Kazhdan-G. Margulis, it has been extended to the Riemannian setting by G. Margulis for manifolds of non positive curvature. The goal of these lectures is to present the recent work of  V. Kapovitch and B. Wilking who gave a sharp version of the Margulis lemma under the assumption that the Ricci curvature is bounded below. Their method ...
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Conférences

le (1h29m12s)

Démocratie : histoire, combats, critiques. 3e table ronde : La démocratie, ses démons et ses ennemis

Ouverture de la journée d’étudespar Olivier Remaud, maître de conférences à l’EHESS, directeur du CESPRA Présentation de la journée d’études par Sylvie Mesure, directrice de recherche au CNRS (GEMASS), et Perrine Simon-Nahum, directrice de recherche au CNRS (CESPRA). 1ère table ronde : Raymond Aron avant Démocratie et totalitarisme Président de séance: Olivier Remaud (EHESS - CESPRA) Vincent Duclert, membre du CESPRA : Les démocraties face à«l'ère des tyrannies» ...
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Cours magistraux

le (1h29m10s)

Thomas Richard - Lower bounds on Ricci curvature, with a glimpse on limit spaces (Part 1)

The goal of these lectures is to introduce some fundamental tools in the study of manifolds with a lower bound on Ricci curvature. We will first state and prove the laplacian comparison theorem for manifolds with a lower bound on the Ricci curvature, and derive some important consequences : Bishop-Gromov inequality, Myers theorem, Cheeger-Gromoll splitting theorem. Then we will define the Gromov-Hausdorff distance between metric spaces which will allow us to consider limits of sequences of Riemannian manifolds, along the way we will prove ...
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