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B What base to classify different string theory?

  1. Aug 26, 2016 #1
    I do not know why can they classify 5 theories of superstring.Is that correct that they base on different symmetries?
     
  2. jcsd
  3. Aug 28, 2016 #2

    haushofer

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    Science Advisor

    They are motivated because of different boundary conditions one can impose. This gives different theories, which however are related by dualities.
     
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