The wave function Φ ( ϕ ) = e i m l ϕ = Φ ( ϕ + 2 π ) if and only if m l is restricted to the values 0 , ± 1 , ± 2 , ... .

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Chapter 41, Problem 41.17E

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To show: The wave function Φ(ϕ)=eimlϕ=Φ(ϕ+2π) if and only if ml is restricted to the values 0,±1,±2,... .

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