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State Vectors of a Sum of Hamiltonians

  1. Feb 21, 2010 #1
    I'm reading from my textbook "Foundations of Quantum Physics," and came across a statement that sounds trivial but I don't know how to prove. The passage can be found at http://books.google.com/books?id=3rxOHtn85qcC&pg=PA289#v=onepage&q=&f=false".

    Does anyone have any information on the proof of this theorem?
     
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. Feb 21, 2010 #2
    Maybe someone could just explain it in plain English rather than a proof?
     
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