Updates:
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Comment #26 on issue 1525 by [email protected]: No integration by substitution
http://code.google.com/p/sympy/issues/detail?id=1525

https://github.com/sympy/sympy/pull/336; I just wrote factorial(x) as gamma(x + 1) in the test and changed the other test to read x! instead of gamma(x + 1). The more drastic change would be to have the series test for expr.func = factorial and change it to gamma and add 1 to the arg, but that seems hackish.

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