Updates:
        Cc: [email protected]

Comment #8 on issue 1893 by asmeurer: integrate(log(x) * x**(k-1) * exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893

By the way, computing the expected value of functions under popular distributions will be a common use case of your code. I suppose Matthew will be telling you where these fail, but along with integral transforms, I think this is a common use case of definite integration that you should try to make work in the common cases.

and decides the g-functions are better than the mess at the intermediate stages.

What's the logic behind this? It seems that non-G-Functions would be better than G-Funcitons in general, but maybe I have a different concept of "simple" than you.

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