Contents

1 Introduction

2 Schwarzschild and Einstein exchange letters

3 Meeting the criteria set by Einstein

4 Schwarzschild's trick for addressing the determinant condition

5 Schwarzschild reverts to spherical coordinates

6 A qualitative comparison between Droste and Schwarzschild

7 Schwarzschild calculates three integrals

8 Schwarzschild deduces Einstein's formula for the orbit of Mercury

9 Schwarzschild employs the same trick for an internal solution

10 Schwarzschild again reverts to spherical coordinates

11 Schwarzschild's collapsing sphere

12 Matching the exterior and interior solutions

13 Einstein's preference for his approximate solution over Schwarzschild's

14 Why did Einstein stick to the approximation approach?