- Riemann geometry, metric tensor ,
covariant components

- contravariant components of metric tensor

- Christoffel symbols of the first kind

- Christoffel symbols of the second kind
- Riemann curvature tensor

- Ricci tensor

- for a general metric in 4D, there are 9 990 diagonal and 13 280
off-diagonal terms
- Ricci scalar

- Einstein vacuum equations

- system of second order nonlinear partial differential equations with cosmological constant

Richard Liska