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Homework Help: Laplace's Transform: Initial-value Theorem applied to the n-th derivative

  1. Jan 14, 2010 #1
    1. The problem statement, all variables and given/known data

    Prove that, under the right assumptions, lims tends to infinity sn+1F(s) = f(n)(0+)

    3. The attempt at a solution

    I don't have a problem with the common initial-value theorem, under the assumptions that both f and f' are partly continuous and of exponential order. Then I can find that the absolute value of sF(s) tends to f(0+).

    But for f(n)(t), the Laplace's transform is sn+1F(s) - [snf(0+) + sn-1f'(0+) + ... + f(n)(0+)].

    Should I make the assumption that all initial values except for f(n)(0+) are equal to zero?
     
  2. jcsd
  3. Jan 15, 2010 #2
    Anybody?
     
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