Comment #9 on issue 51 by asmeurer: RootOf for polynomial equations
http://code.google.com/p/sympy/issues/detail?id=51
There is a strange bug in the latest polys8:
In [2]: RootOf(x**5 - x + 3, 0)
Out[2]:
⎛ 5 ⎞
RootOf⎝x - x + 3, 0⎠
In [3]: A = RootsOf(x**5 - x + 3, x)
In [4]: A
Out[4]: RootsOf(Poly(x**5 - x + 3, x, domain='ZZ'))
In [6]: list(A.roots())
AttributeError: 'RootOf' object has no attribute 'expr'
In [21]: RootOf(x**5 - x + 3, 0) # Note that this worked above
AttributeError: 'RootOf' object has no attribute 'expr'
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