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Homework Help: Convolution area property derivation

  1. May 16, 2012 #1
    1. The problem statement, all variables and given/known data
    Let y(t) be the convolution of x(t) with h(t), show that the area under y(t) is the product of the areas under x(t) and h(t)

    2. Relevant equations
    Convolution definition

    3. The attempt at a solution
    I found a derivation but it skips a step, uploaded it here:
    htt p://i50.tiny pic.com/s15dus.jpg
  2. jcsd
  3. May 17, 2012 #2
    What's the step that you were wondering about?

  4. May 17, 2012 #3
    I don't get how it is possible to separate the integrals in "exchanging the order of integration"
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