This is little more than a list of equations under title headings without any discussion or effort to build any intuition. If you are thinking of purchasing this hoping for an insightful discussion of the General Relativity theory you won't get anything like that from *this* Dirac book. This book has as much of Dirac's own typically lucid thinking in it as any other book which also isn't really by P.A.M. Dirac. i.e., *none at all*. This is NOT a useful book though it is very thin and slight so it might be useful in preventing drafts from getting under very narrow doorways.