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