- #1
broegger
- 257
- 0
Hi,
I was just reading up on some astrophysics and I saw the line element (general relativity stuff) written in spherical coordinates as:
I don't get this. dr is the distance from origo to the given point, so why isn't ds^2 = dr^2 without the other stuff?
I was just reading up on some astrophysics and I saw the line element (general relativity stuff) written in spherical coordinates as:
[tex]ds^2 = dr^2 + r^2(d\theta^2 + \sin\theta\d\phi)[/tex]
I don't get this. dr is the distance from origo to the given point, so why isn't ds^2 = dr^2 without the other stuff?