2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/101864This paper has been withdrawn because the new one gr-qc/0512095 includes all its results (as well as those in gr-qc/0511016) in a clearer way.This paper has been withdrawn; the new paper gr-qc/0512095 replaces both, the present one and gr-qc/0511016General Relativity and Quantum CosmologyA note on the extendability of compact hypersurfaces to smooth Cauchy hypersurfacestext