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Why is addition of angular momenta important in Quantum Mechanics?

  1. Jul 14, 2013 #1
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 14, 2013 #2
    In many applications total angular momentum commutes with the Hamiltonian whereas orbital/spin angular momenta do not by themselves.
     
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