7.4.1 of Griffith's Introduction to Electrodynamics 2nd Ed
Potentials A and V in electrodynamics.
NOTE: I get the Laplacian of A wrong. It's the Laplacian of Ax in the x direction, Laplacian of Ay in the y direction, and the Laplacian of Az in the z direction. What I described was the gradient of the divergence.
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