On 20 September, 2017 I gave a talk in the Monash topology seminar
Title:
Plane graphs and Grassmannian positivity
Abstract:
In recent years there has been excitement about some developments in physics relating to an object called the “amplituhedron”. This talk is not primarily about the amplituhedron or physics, but about some of the mathematics behind it. This mathematics, much of it due to Alexander Postnikov, involves wonderful combinatorics and topology, connecting plane graphs and networks with the theory of Grassmannians and their non-negative cells. I’ll try to explain some of this mathematics; no knowledge of Grassmannians or physics will be assumed.
Plane graphs and Grassmannian positivity, September 2017