Index notation

Hello world,

Index notation is driving me crazy: why on Earth is ∂_i 1/r = -x_i/r^3 ?

I would expect it to be -x_i/r^2...

Thanks for commenting


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welcome to pf!

hello ellocomateo! welcome to the world! :smile:

(try using the X2 and X2 buttons just above the Reply box :wink:)

∂r/∂x = … ? :wink:
Oh, you mean chain rule and ∂r/∂i=xi/r

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