Comment #9 on issue 2081 by asmeurer: Pow substitution introduces wrong answers
http://code.google.com/p/sympy/issues/detail?id=2081
./setup.py test will run all tests. ./bin/test <PATH> will test just one path (which Is faster if you know where yu want to look at).
As for that substitution, you have to understand that once you enter the realm of symbolic integration, you no longer care about these assumptions thngs and only consider expressions algebraically. The reason fr this is that the integration algorithm is based on the algebaic nature of functions when you take their derivatives (so for example, log(x) in this context refers to the unique function f that satisfies Df = Dx/x).
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