A classical excellent work in mathematical general relativity

This book is now a classic, but the book of Stephen Hawking is the more elegant one on modern General Relativity and will be used for many years to come and is certainly one of the most widely quoted in the subject.
It covers in brilliant form the gravitational collapse of a star, the theory of black holes, the space-time singularities, the causal structure of space-time, and in its end the initial singularity of the universe, popularly known as the Big Bang. The book is highly mathematical, and is presupposed that the reader have studied basic abstract algebra and point set topology. But, for the readers highly interested in these subjects, this is not an obstacle. All theoretical physicists interested in modern General Relativity should have this book, a testimony of the Genius of Stephen Hawking. Definitively, a magnificent book!