### What's Up

### Most Read Articles

- Riemann curvature tensor and Ricci tensor for the 2-d surface of a sphere
- Christoffel symbol exercise: calculation in polar coordinates part II
- Riemann curvature tensor part I: derivation from covariant derivative commutator
- Metric tensor exercise: calculation for the surface of a sphere
- Christoffel Symbol or Connection coefficient

## Einstein

New category dedicated to Einstein's life, papers and quotations.