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Help understanding integral

  1. Mar 31, 2013 #1

    Equation 4.6 strikes me as wrong. The integral is [itex]\int_{0}^{\infty} B \mathrm{d}B[/itex]

    The limits of the integral seem to be values of z, but the integral seems to be wrt B. If the limits were values of B, the answer would be ∞. It's clearly not, but I don't understand this.
  2. jcsd
  3. Mar 31, 2013 #2
    It looks like he's cancelled the dz from numerator and denominator in 4.5 and is left with BdB, but instead of writing the limits as B(z=0) and B(z=inf), they've just written 0 and inf.

    The limits would be correct before dz were cancelled, but after, they should be changed. If this is the correct interpretation then I agree it's a little sloppy.
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