A stable version of Gromov’s angle-shrinking problem and its index theoretic applications (Part II)
By Jinming Wang
A stable version of Gromov’s angle-shrinking problem and its index theoretic applications (Part I)
By Zhizhang Xie
By Larry Guth
Appears in 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.