Orateur(s)  Greg Kuperberg  UC Davis,

Titre  The CartanHadamard Problem and the Little Prince 
Date  14/03/2017 
Horaire  14:00 à 15:00 

Résume  Among ndimensional regions with fixed volume, which one has the least boundary? This question is known as an isoperimetric problem; its nature depends on what is meant by a ”region”. I will discuss variations of an isoperimetric problem known as the generalized CartanHadamard conjecture: If Ω is a region in a complete, simply connected nmanifold with curvature bounded above by k≤ 0, then does it have the least boundary when the curvature equals k and Ω is round? It was originally inspired by the problem of finding the optimal shape of a planet to maximize gravity at a single point, such as the place where the Little Prince stands on his own small planet. 
Salle  Barre 1525, 5ème étage, salle 02 
Adresse  Campus Pierre et Marie Curie 