In Dirac's book on GRT, top of page 17, he has this: (I'll use letters instead of Greeks)(adsbygoogle = window.adsbygoogle || []).push({});

g^{cd}g_{ac}(dv^{a}/ds) becomes (dv^{d}/ds)

I seems to me that that only works if the metric matrix is diagonal.

(1) Is that correct?

(2) If so, that doesn't seem to be a legitimate limitation on the property of geodesics??

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# Stationary property of geodesics - Dirac

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