**Light Rays, Singularities, and All That**

by Edward Witten

**Publisher**: arXiv.org 2019**Number of pages**: 105

**Description**:

This article is an introduction to causal properties of General Relativity. Topics include the Raychaudhuri equation, singularity theorems of Penrose and Hawking, the black hole area theorem, topological censorship, and the Gao-Wald theorem.

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