2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/129858These notes are a companion to the article "Lorentz spacetimes of constant curvature" by Geoffrey Mess, which was first written in 1990 but never published. Mess' paper will appear together with these notes in a forthcoming issue of Geometriae Dedicata.26 pagesDifferential GeometryMathematical PhysicsGeometric Topology83C80; 57S25text