ion rules = ‘riPbRab sin(4). — +fr + kb) +a = wo+71 Rabcos(fa — +6 ± kb) (nn It is easy to check that with the choice of r = —₹ this reproduces Schroedinger quantum mechanics. To see this we write the general quantum state. fi le .301 Pp >= Vrs2e—df A fe- dmf" which clearly is a property of the ensemble and