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Homework Help: I need some help with an Integration

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  1. Jun 18, 2016 #1
    I need some help with an Integration. Here's the equation

    I = ##\int_0^∞ \frac {x^{n+1}} {1 + x^n} ⋅ e^{-x^2/{2 \sigma^2}} ##

    I have tried to solve the equation by simplifying first like
    let, ## \frac x {\sqrt 2 \sigma} = v ##, so the ##x = v \sqrt 2 \sigma##
    then, ##dx = \sqrt 2 \sigma d v##
    Also, let ## {\sqrt 2 \sigma} = m, and \ 1+n = p##

    Finally, the integration is simplified as follows

    I = ##m^{p+1} \int_0^∞ \frac {e^{-v^2}⋅ v^p} {{1 + v^{p - 1} m^{p - 1}}} dv##

    Now i don't know what to do from here!!!
    Thank you in advance for your attention to to this post.
    I would appreciate any help.
     
    Last edited by a moderator: Jun 18, 2016
  2. jcsd
  3. Jun 18, 2016 #2

    Mark44

    Staff: Mentor

    I would start with integration by parts, with ##u = \frac{x^n}{1 + x^n}## and ##dv = xe^{-x^2/{2 \sigma^2}} dx##. I don't guarantee that this would work, but that's what I would start with.

    Also, in future threads, please don't delete the Homework Template. Its use is required.
     
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