Schwarzschild spacetime
Information paradox
Semi-regular semi-Riemannian manifolds
Penrose diagrams
Cosmology
Degenerate manifolds
Schwarzschild black hole
General relativity with degenerate metric
Einstein equation
Cauchy problem in general relativity
Black holes
Global hyperbolicity
Cosmic censorship
Warped product
Singular general relativity
Singular semi-Riemannian manifolds
Singular semi-Riemannian geometry
Schwarzschild metric
Singularity theorem
Semi-regular semi-Riemannian geometry