4. ( /10 pts) For systems with half integer values of angular momentum, we can define the oper- ators Ar = $2 ( 2 +
4. ( /10 pts) For systems with half integer values of angular momentum, we can define the oper- ators Ar = $2 ( 2 + npy ) AL = a h Py 31 = 12 (Px - by) El = 12 (Px + azy), where a is a dimensional constant. Show that [Er, A] = -ih
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