2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191951We point out that the BTZ black holes, and their relatives, can be defined in a cleaner way than they originally were. The covering space can be taken to be anti-de Sitter space, period, while scri splits up into components due to Misner singularities. Our definition permits us to choose between two conflicting claims concerning BTZ black holes in 3+1 dimensions.16 pages, 4 figures; minor polish addedGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext