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have i got this corresct :

[itex]g_{\mu\nu}g_{\mu\nu}T^{\mu\nu} = T g_{\mu\nu} = T_{\mu\nu}[/itex]

and is:

[itex]g_{\mu\nu}g_{\mu\nu}u^{\mu} = g_{\mu\nu} u_{\nu} = u_{\mu}[/itex]

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# Lowering tensor indices

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