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Can someone help me understand Shankar (Principles of Quantum Mechanics) 18.4.3 part 4? It says: Show...

Can someone help me understand Shankar (Principles of Quantum Mechanics) 18.4.3 part 4? It says: Show that if we want to make any further gauge transformations within the Coulomb gauge, lambda must be time independent and obey the Laplacian of lambda = 0. If we demand that the magnitude of A goes to 0 at spatial infinity, A becomes unique.

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