2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34731The causal boundary construction of Geroch, Kronheimer, and Penrose has some universal properties of importance for general studies of spacetimes, particularly when equipped with a topology derived from the causal structure. Properties of the causal boundary are detailed for spacetimes with spacelike boundaries, for multi-warped spacetimes, for static spacetimes, and for spacetimes with group actions.22 pages; from BeemFest of May, 2003General Relativity and Quantum Cosmologytext