Comment #7 on issue 2022 by asmeurer: inconsistent behaviour of subs when using non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=2022
Well, I think we should still keep the option to make (x**3).subs(x**2, y) become y**(3/2) (though I don't know if by default), because sometimes you just want subs to try as hard as it can to eliminate the old term. And remember that the powers might not be so explicit, like exp(2*x).subs(exp(3*x), y), or something more complex than that.
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