When contracting [itex]R^{\sigma}_{ \mbox{ }\mu\nu\rho}[/itex] to [itex]R_{\mu\nu}[/itex](adsbygoogle = window.adsbygoogle || []).push({});

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

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# Contracting tensors

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