General Relativity

[dx]

http://en.wikibooks.org/wiki/General_relativity

[pervect]

Author: Sean Carroll, University of Chicago

http://pancake.uchicago.edu/~carroll/notes/

pdf version
http://xxx.lanl.gov/abs/gr-qc/9712019

[attacc]

Other tutorials about relativity

General Relativity
http://freescience.info/books.php?id=24

Special Relativity
http://freescience.info/books.php?id=180

[explain]

Here (http://www.theorie.physik.uni-muenchen.de/~serge/T7/) is a set of free lecture notes on advanced stuff like index-free calculations with vectors and tensors, differential forms, null surfaces, asymptotic flatness, singularity theorems, tetrad formalism, and spinors in GR. This is a free book in the sense of FDL (http://www.gnu.org/copyleft/fdl.html).

[Edgardo]

The website
Relativity on the World Wide Web (http://math.ucr.edu/home/baez/RelWWW/)
by Chris Hillman

contains a large collection of links to relativity websites and lecture notes
on the level of introductory as well as advanced.

[Mentz114]

Dx, your link is to an empty page - fancy writing it ?

[chessforce]

Tensors (an essential topic to GR): http://www.grc.nasa.gov/WWW/K-12/Numbers/Math/documents/Tensors_TM2002211716.pdf