In the first chapter of this book, starting from the Einstein-Hilbert action, the Einstein field equations are derived step by step and with all possible mathematical details explained carefully.
 
In the second and third chapter of the book the Einstein field equations are solved with every possible mathematical detail included, to arrive at:
1) The Schwarzschild solution
2) The Reissner–Nordström solution
 
There is a gap in modern physics literature, and this book comes to explain clearly many subtle mathematical points. The book is 31 pages long, and it will fit well in every physics library. Buyers will immediately receive links to download their digital products.