"Degenerate manifolds"@en . "Global hyperbolicity"@en . . "Schwarzschild spacetime"@en . "Information paradox"@en . . "6be5035ac071be350cd62c6772e6d846" . "Semi-regular semi-Riemannian geometry"@en . "Singular semi-Riemannian geometry"@en . . "Schwarzschild black hole"@en . . "Singular semi-Riemannian manifolds"@en . "Stoica Ovidiu Cristinel" . "Schwarzschild metric"@en . "Semi-regular semi-Riemannian manifolds"@en . "Warped product"@en . "Stoica" . "Ovidiu Cristinel" . "Black holes"@en . "Singularity theorem"@en . "Singular general relativity"@en . "Cauchy problem in general relativity"@en . "Cosmic censorship"@en . "Einstein equation"@en . <253123925> . . . . "General relativity with degenerate metric"@en . . "Cosmology"@en . "Cartan's structural equations" . "Penrose diagrams"@en . <0000-0002-2765-1562> .