Comment #2 on issue 2997 by [email protected]: collect mishandles power rules http://code.google.com/p/sympy/issues/detail?id=2997
ughh...what I should have said is that you can freely move and integer in and out of the product but not an *unknown* quantity (like the x) so changing x**(2*y) to (x**y)**2 is ok but changing it to (x**2)**y is not (unless x is positive or y is an integer).
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