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In 3D periodic boundary conditions (PBC), the electrostatic potential is underdetermined by a constant. Is this also true for any other periodicity as 2D or 1D?

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    $\begingroup$ The condition of periodicity does not change if a constant is added to the potential. This is true for 1D, 2D and 3D. $\endgroup$ – Alex Trounev Mar 24 at 13:32

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