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x and p using the raising/lowering operator relations in Eq.2.70. But the relation for ˆp contains...

x and p using the raising/lowering operator relations in Eq.2.70. But the relation for ˆp contains an i whereas observables should be real. Is it a problem for < p >? (Why or why not?) How about the operator combinations xp, xp + px, and [x, p]. Can these be measured? If so, are they real? Explain your answers.

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