Comment #1 on issue 3877 by [email protected]: subs should recognize powers
with exponent 1
http://code.google.com/p/sympy/issues/detail?id=3877
def _eval_subs(self, old, new):
... if old == self:
... return new
... if old.is_Pow:
... return Pow(self, 1, evaluate=False).subs(old, new)
...
Symbol._eval_subs = _eval_subs
(sqrt(x)**3 + sqrt(x) + x + x**2).subs(sqrt(x),y)
y**4 + y**3 + y**2 + y
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