Comment #13 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
Hm. Combsimp is definitely not idempotent (should it be?):
Perhaps not, if it's too difficult to make it so. But we should definitely strive for simplify() to be. This is a different issue, though...
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