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Who introduced the comma notation for partial derivatives?

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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