

Degenerations in convex projective geometry and non-archimedean ordered fields
De Anne Parreau


On manifolds with almost non-negative Ricci curvature and integrally-positive kth-scalar curvature
De Andrea Mondino
De Larry Guth
Apparaît dans la collection : Not Only Scalar Curvature Seminar
We will survey the connection between the Lipschitz constant of a map $f$ (between Riemannian manifolds) and the topological type of the map. We will mostly focus on the degree of the map, because the story is already quite complex in that case. If $f\colon M^n \to M^n$ has Lipschitz constant $L$, then the degree of $f$ is at most $L^n$. When $M$ is $S^n$, there are self maps with Lipschitz constant $L$ and degree at least $c_n L^n$. But what happens for other manifolds? We will survey recent developments on this question by Aleksandr Berdnikov and Fedor Manin. We will see some clever maps that are somewhat related to the maps Robert will talk about in the following talk.