On Sun, Aug 14, 2011 at 2:26 PM, Aaron Meurer <[email protected]> wrote:
> Mathematica or WolframAlpha?

Alpha. It gives the expression unchanged and then the expression as it
would appear if x and y were positive. Because of autoexpansion of
positive bases under Rationals, sympy can't presently show the
expression as `(x**21*y**7)**(1/4)`.

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