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Comment #2 on issue 2081 by asmeurer: Pow substitution introduces wrong
answers
http://code.google.com/p/sympy/issues/detail?id=2081
So it's fine if x is positive, right? For example, if instead of x**3, you
had exp(3), this is just fine. This is a commonly used algebraic
substitution, so I am wondering how much of sympy will break if you make
this change (try doing it and running the tests).
By the way, there are already plans to make it so you can turn this kind of
substitution off in subs, or only make it active if the resulting exponent
is an integer.
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