I happened across the following unexpected result from sympification
of an expression:
>>> x=Symbol('x',dummy=True)
>>> diff(sympify('x**(1/2)'),x)
0
>>> x=Symbol('x')
>>> diff(sympify('x**(1/2)'),x)
1/(2*x**(1/2))
Is this an issue that two different results are obtained when
differentiating the sympified sqrt(x) expression? If I don't sympify
the expression first, then using a dummy symbol is no problem:
>>> x=Symbol('x',dummy=True)
>>> diff(x**(S(1)/2),x)
1/(2*_x**(1/2))
>>>
/chris
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