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I need a formulation of the equation for Coulomb's potential. It needs to be an integral that applies to densities (so no delta functions). (I think the relevant densities are charge densities?) Also, it needs to be relativistic.

So far I have:

? = [itex]\int[/itex][itex]\frac{ρ(r', f(r'))}{|?-r'|}[/itex]d^{3}r'

What exactly do I write instead of the two question marks?

And what is the function f?

Anyone who can help gets a big cyberhug.

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# Relativistic Coulomb potential - how to understand the equation

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