History of Science and Mathematics Asked on September 2, 2021
In general relativity, it is common to use the comma notation for partial derivatives
$$frac{partial g_{munu}}{partial x_rho} = g_{munu_,rho}$$
Where did this notation first appear? Was it known in general mathematics before Einstein?
I don’t know much about mathematics books, but I traced it back to Synge’s book on General Relativity(1960). Could it have arisen earlier?
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