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Integrate Laplacian operator by parts

  1. Jan 18, 2016 #1
    upload_2016-1-18_18-33-58.png
    This is the key step to transform from position space Schrodinger equation to its counterpart in momentum space.
    How is the first equation transformed into 3.21?
    To be more specific, how to integral Laplacian term by parts?
     
    Last edited: Jan 18, 2016
  2. jcsd
  3. Jan 18, 2016 #2

    dextercioby

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    Do you know tensor tensor calculus or at least the Gauss-Ostrograski theorem in 3D?
     
  4. Jan 18, 2016 #3
    upload_2016-1-18_21-6-4.png
    Thanks for the hint!
     
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