Comment #2 on issue 234 by smi...@gmail.com: Order needs zero point information, for eg making subs to work correctly
http://code.google.com/p/sympy/issues/detail?id=234
Although the subs still gives the same answer, the limit works, doesn't it:
(1+O(x**2)).subs(x,1/y)
O(y**(-2))
O(x**2).limit(x,0)
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