Has anyone seen this identity:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]g^{ab}\nabla g_{ab}=\nabla ln|g|[/tex]

I've seen it used, but want to figure out where it comes from.

Does anyone know a name or have any ideas??

**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!

# Derivative of metric and log identity

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