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Problem with integration.

  1. Jul 21, 2008 #1
    Hi, already tried few routines from GSL and it seems it doesn't work.

    Function: 1/(x^2 - alpha^2)

    Can anyone tell how to calculate that numerically.
    Tried to do it by "hand" as well but no good results.

  2. jcsd
  3. Jul 21, 2008 #2


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    You don't need a numerical solution for this. I assume alpha is just an arbitrary constant. Note that the denominator can be written as a product of 2 functions.
  4. Jul 21, 2008 #3
    Thanks for respond.

    Actually the problem is bit more complicated. Integral is (-inf, inf) and whole function is equal to:

    f(y,z) = int_(-inf,inf) dx [2y/(x^2-y^2) ] * [ 1/(exp{x-z} +1)]

    What do u think about that.
  5. Jul 21, 2008 #4


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    You mean this:
    [tex]f(x,y,z) = \int^{\infty}_{-\infty} \left( \frac{2y}{x^2-y^2} \right) \frac{dx}{e^{x-z}+1}[/tex]
  6. Jul 21, 2008 #5
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