Some of the key concepts in GR include...

\section{Mathematical Framework}

The mathematical framework of GR is based on Riemannian geometry, which describes the curvature of spacetime using the Riemann tensor. The Riemann tensor is a mathematical object that describes the curvature of spacetime at a given point, and is defined as:

In conclusion, GR is a fundamental theory of gravity that has revolutionized our understanding of the universe. The theoretical minimum required to understand GR includes a knowledge of the mathematical framework, including the EFE, the Riemann tensor, and the Christoffel symbols, as well as an understanding of key concepts such as curvature, geodesics, and the equivalence principle. GR has a wide range of applications, including black holes, cosmology, and gravitational waves, and continues to be an active area of research.

https://www.dropbox.com/s/9dx8p6d7jt37vqj/Theoretical%20Minimum%20General%20Relativity.pdf?dl=0

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