Relativity has been around since 1915, so there has been a lot said in almost a century. Each chapter builds up to doing the Einstein field equations and I had my old Maple math program from the 90's on 3.5 disks and wrote the code to do some Schwarzschild radius formulas of a black hole calculations(I still have a working 486 with a 3.5). In the end, it was a lot of work and fun and upgraded to Maple 10 and gave me a feeling of working over in France at CERN. Again, with a little thought of the presentation, I would have gave the book a five star.