3 problems

A Margulis spacetime is a quotient of Minkowski space $\mathbb{R}^{2,1}$ by a properly discontinuous affine action, and a crooked plane is a piecewise-linear surface in…

Charette–Drumm–Goldman conjecture. The group $\Gamma$ has a fundamental domain bounded by crooked planes.

A Margulis spacetime is a complete affine Lorentzian $3$-manifold with free, properly discontinuous holonomy action and non-compact Cauchy surface. In the preceding construction, “…