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Why is OPW complete?

  1. May 14, 2014 #1
    Orthogonal plane waves can be used to expand Bloch waves. It is better than plane waves because it converges more quickly. However, I've got a problem. The completeness of plane waves is guaranteed by Fourier analysis. Why is OPW complete? It is orthogonal to core levels. But does it mean OPW is complete?
  2. jcsd
  3. May 18, 2014 #2
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