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Homework Help: Hamiltonian commutator

  1. Feb 2, 2012 #1
    1. The problem statement, all variables and given/known data

    How do I obtain [H,P_x]? P_x is the polarization operator.


    2. Relevant equations

    [tex] H=-\frac{\hbar^2}{2m}\frac{\partial^2 }{\partial x^2}+V(x) [/tex]

    [tex] P_x=2Re[c_+^*c_-] [/tex]


    3. The attempt at a solution

    I know how to commute H and x. But somehow can't think of a way to do the same for H and P_x.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 2, 2012 #2
    write P_x instead of x; then do the commutation just as you do for x
     
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