The Problem of Two Sticks

Luis A. Caffarelli, Michael G. Crandall

Let $l=[l_0,l_1]$ be the directed line segment from $l_0\in {\mathbb{R}}^n$ to $l_1\in {\mathbb{R}}^n.$ Suppose $\bar{l}=[{\bar{l}}_0,{\bar{l}}_1]$ is a second segment of equal length such…