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Is there any closed-form expression for the following integral:

$\int_0^\infty \frac{1}{(1+a_i s) \prod_{j=1}^n (1+a_j s)^k} ds $

where the ai are >0 and k is a positive integer. And, if k is not an integer?

Thank you

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    $\begingroup$ Is this meant to be a correction of mathoverflow.net/questions/86101/… or a separate question? If the former, then please in the future edit the original question instead of reposting it. $\endgroup$ Jan 19, 2012 at 15:00

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This looks very much like a Lauricella Hypergeometric function: http://en.wikipedia.org/wiki/Lauricella_hypergeometric_series

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