phy-4600/lecture_notes/1-27/Expectation Value Time Dependence
2016-02-12 12:26:39 -05:00

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Computed Derivative (pic) d/dt <Â> (pic)
Discovered/Introduced Commutator
Cpmpatible Observables occur when commutator is equal to 0.
[Ĥ,Â] = ĤÂ - ÂĤ
Constant of Motion
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if d/dt  = 0 and [Ĥ,Â] = 0,
then  is a constant of motion
Thm: Two operators such that [Â,B̂] always have common Eigenstates