# Contracting tensors

1. Mar 19, 2013

When contracting $R^{\sigma}_{ \mbox{ }\mu\nu\rho}$ to $R_{\mu\nu}$

Should one multiply by $g^{\alpha\rho}g_{\alpha\sigma}$? I often get confused with ordering of indices and such like

2. Mar 19, 2013

### Fredrik

Staff Emeritus
3. Mar 19, 2013

there was no real answer, ignore the ricci tensor i just mean in general then, I don't really understand the order in which the indices should go, if it even matters at all.

4. Mar 19, 2013

### Fredrik

Staff Emeritus
If you're not satisfied with the answers, you should say that in the same thread, not start a new one.