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Zwiebach string theory question

  1. Sep 19, 2007 #1
    1. The problem statement, all variables and given/known data

    Sorry this page is not part of the free preview but I would recommend that everyone buy their own Zwiebach (or download it illegally if ethics don't stop you).

    Anyway, on page 109, can someone help me figure out where the last equality in equation 6.79 comes from?

    Thanks.


    2. Relevant equations



    3. The attempt at a solution
     
    Last edited: Sep 19, 2007
  2. jcsd
  3. Sep 19, 2007 #2

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    It comes from equation 6.78 (that might sound like a guess, but I really did check the book).
     
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