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The operator of momentum (layman question)

  1. May 17, 2014 #1
    I found two "forms" of it:



    how could they be the same??
  2. jcsd
  3. May 17, 2014 #2


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    Multiply the right hand side of the first equation with i/i.

  4. May 17, 2014 #3
    oh...yes thanks a lot
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