2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72603The existence of closed hypersurfaces of prescribed curvature in globally hyperbolic Lorentzian manifolds is proved provided there are barriers.27 pages, a pdf version can also be retrieved from http://www.math.uni-heidelberg.de/studinfo/gerhardt/GaussLorentz.pdf and bibtex data from http://www.math.uni-heidelberg.de/studinfo/gerhardt/bibtexcg00b.htmlDifferential Geometrytext