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Strange integral of heaviside step function

  1. Nov 14, 2015 #1
    I ran across this integral while reading Ashcroft and Mermin's solid state physics book....

    ∫Θ(f - f(t) )dt = t_max - t_min

    Where Θ is the heaviside step function and the integral runs from 0 to infinity.

    Does anyone have any idea how this integral makes sense?
  2. jcsd
  3. Nov 14, 2015 #2


    Staff: Mentor

    Can you post a picture of the page that shows this integral?
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