Comment #10 on issue 2081 by rosen.diankov: Pow substitution introduces wrong answers
http://code.google.com/p/sympy/issues/detail?id=2081
From reading the issues, it seems that other users have different expectations of what "subs" is really supposed to be doing. If substitution for integration is the special case, then perhaps there should be a different implementation for it that ignores a lot of the assumptions that preserve semantics of the expression.
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