トポロジーワーキングセミナー


2017/7/3(Mon)

15:00--16:00 理学部 b棟 b342/346

Todd Drumm

Howard University

The Ping-Pong Lemma and Lorentzian Geometry

We will investigate the evolution of the application of the Ping-Pong Lemma from the hyperbolic plane (and other geometries) to Lorentzian three-space. On the way, we will see how Crooked Planes have become a basic oject of Lorentztian geometry. We shall also discuss the generalization of Crooked Planes to higher dimensions.