Question: Consider a scalar operator F which commutes with the angular momentum operator J, show that in the simutaneous eigenket of (J?, J. (i.e., [j, m)),

Consider a scalar operator F which commutes with the angular momentum operator J, show that in the simutaneous eigenket of (J?, J. (i.e., [j, m)), the expec- tation value of F is independent of the quantum number m

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