Comment #3 on issue 3138 by smi...@gmail.com: polys expanded representation
problem
http://code.google.com/p/sympy/issues/detail?id=3138
But what is showing up in the printed form is wrong:
>>> -y + 2**2 + 2*-y + 2*y + y**2 - 4
y**2 - y
That should be zero. The "as_expr" form is right, though.
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