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Presumably, a potential (like a Coulomb one) comes from another particle, which has its own momentum/position uncertainty, but in the Schroedinger equation the potential is well-defined either in terms of some coordinate system or its relation to the particle that the equation is for.

So how does this work? How do we talk about the hydrogen atom as if the nucleus were stationary without violating the uncertainty principle?

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# How can potentials be well-defined without violating U.P.?

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