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From what theorem does this technique come from?

  1. Oct 29, 2011 #1
    The attached image is from "Quantum Mechanics: A self contained course" by Atkinson and Hounkonnou.

    I've seen this used a lot, and I know this is simple, but I still don't know the principle behind this. From what theorem does this method come from? Can someone give me something like a Wikipedia link please?


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  2. jcsd
  3. Oct 29, 2011 #2
  4. Oct 29, 2011 #3
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