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Zwiebach page 225

  1. Oct 28, 2007 #1
    1. The problem statement, all variables and given/known data
    Shouldn't there be an

    [tex] \alpha_{-1}\alpha_{1} [/tex]

    added to equation 12.130 on account of equation 12.129, or is that 0 for some reason?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 28, 2007 #2
    If you work out the sum of the commutators of the terms in parentheses in equations (12.125) and (12.126), and use equation (12.128), you will find it deficient from [itex]4L_0[/itex] by exactly [itex]\alpha_{-1}\alpha_1[/itex].
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