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Multiple choice
When the 3D Schrodinger equation for a central potential is separated as ψ=R(r)Y(θ,ϕ)\psi = R(r)\,Y(\theta,\phi), the azimuthal equation gives Φ(ϕ)=exp(imϕ)\Phi(\phi) = \exp(i\,m_\ell\,\phi). What physical requirement forces mm_\ell to be an integer?