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Homework Help: Zwiebach page 229

  1. Oct 28, 2007 #1
    1. The problem statement, all variables and given/known data
    Why does Zwiebach say that M^{\mu \nu} is guarenteed to be tau-independent in the paragraph below equation 12.155?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 28, 2007 #2
    See the discussion between equations (8.61) and (8.62) on page 144.
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