I want to calculate the commutator ##{\Large [p_i,\frac{x_j}{r}]}## but I have no idea how I should work with the operator ##{\Large\frac{x_j}{r} }##.(adsbygoogle = window.adsbygoogle || []).push({});

Is it ## x_j \frac 1 r ## or ## \frac 1 r x_j ##? Or these two are equal?

How can I calculate ##{\Large [p_i,\frac 1 r]}##?

Thanks

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# Coulomb potential as an operator

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