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Assuming anticommutation relations \[ [a_m, a_n]_+=0, \quad [a_m, a_n^\dagger]_+=\delta_{mn}, [a_m^\dagger, a_n^\dagger]_+=0, \] Prove that the number operators \(N_n= a_n^\dagger a_n \) have eigenvalues 0 or 1 only.
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4727:Diamond Point
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