Séminaire Lotharingien de Combinatoire, 80B.23 (2018), 12 pp.
Pavel
Galashin, Steven N. Karp and Thomas Lam
The Totally Nonnegative Grassmannian is a Ball
Abstract.
We prove that three spaces of importance in topological combinatorics are homeomorphic to closed balls: the totally nonnegative Grassmannian, the compactification of the space of electrical networks, and the cyclically symmetric amplituhedron.
Received: November 14, 2017.
Accepted: February 17, 2018.
Final version: April 1, 2018.
The following versions are available: