2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34335Exploiting a multiply warped product manifold scheme, we study the interior solutions of the Banados-Teitelboim-Zanelli black holes and the exterior solutions of the de Sitter black holes in the (2+1) dimensions.13 pagesGeneral Relativity and Quantum Cosmology(2+1) dimensional black holes in warped product schemetext