The problem is this: Consider the operator e−iπLy2ℏ. If you apply it to an eigenstate of L2 and Lx with l=1, prove that the resulting state is an eigenstate of Lz.
The idea is this: Lz(e−iπLy2ℏY1,m)=−iℏ∂∂φ(e−iπLy2ℏY1,m)=...=2ℏ2(e−iπLy2ℏY1,m).
But I don't know how to move from one equation to the other. I would appreciate any help. Thank you.
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