That's a crucial point of GR !(adsbygoogle = window.adsbygoogle || []).push({});

And I have always problems with that.

Back to the basics, with your help.

Thanks

Michel

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Why should the covariant derivative of the metric tensor be 0 ?

**Physics Forums | Science Articles, Homework Help, Discussion**