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A The spectral gap and it's decidability

  1. Dec 14, 2015 #1
    The article on undecidability of presence of spectral gap by describing its microscopic structure seems to contradict the fact that we can decide whether a CNT is metallic or semi -conducting by checking its diameter and its twist.
     
  2. jcsd
  3. Dec 14, 2015 #2

    mfb

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