Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3138 by [email protected]: polys expanded representation problem
http://code.google.com/p/sympy/issues/detail?id=3138
There is something a little strange about the expanded representation of
the following after replacing `x` with `-y+2`:
>>> Poly(x**2 + 2*x*y + y**2 - 4, x, y, domain='ZZ').subs(x, -y+2)
Poly(-y + 2**2 + 2*-y + 2*y + y**2 - 4, -y + 2, y, domain='ZZ')
Notice all the unevaluated terms (`2**2` should be `4`, `2*-y` should be
`-2*y` and cancel the `2*y`, ...)
The expanded form should be zero:
>>> _.as_expr()
y**2 + 2*y*(-y + 2) + (-y + 2)**2 - 4
>>> _.expand()
0
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