Find the following integral:

Unable to use integration by parts I believe for this problem..

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- Apr 17th 2008, 11:47 PMIdeasmanHard Integral
Find the following integral:

Unable to use integration by parts I believe for this problem.. - Apr 18th 2008, 12:08 AMJhevon
- Apr 18th 2008, 12:22 AMlllll
not sure if this will be of any help, but you could also express [tex] e^{-x} as an infinite series then integrate it out.

so you would have:

=

= - Apr 18th 2008, 05:17 AMtopsquark
If this is supposed to be

then this is a gamma function.

-Dan - Apr 18th 2008, 05:21 AMmr fantastic
- Apr 19th 2008, 07:44 PMJhevon
- Apr 19th 2008, 07:54 PMPaulRS
Yes

Let then

Gaussian integral - Wikipedia, the free encyclopedia - Apr 19th 2008, 07:58 PMKrizalid
The well known gaussian integral. There're lots of proofs of its result. :D