Comment #12 on issue 2081 by smi...@gmail.com: Pow substitution introduces
wrong answers
http://code.google.com/p/sympy/issues/detail?id=2081
This substitution is already prohibited in my t2 branch...from which
portions are in review.
h[1] >>> (x**3).subs(x**2,Symbol('y'))
x**3
h[2] >>> (x**4).subs(x**2,Symbol('y'))
y**2
If the exponents are not multiplicatively extractable 9as I recall) they
substitution fails.
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