1. Let nem (r) = Rne(r)Y(0, 0) be the solutions to the stationary Schroedinger equation with a radial potential (Y (9,) are the spherical harmonic functions). Compute the commutator [..] and use that result to show that [d³r nem (r) 23) d'r nem (r)znem (r) = 0 unless m = m'.
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