Comment #7 on issue 3912 by [email protected]: Order terms don't cancel correctly
http://code.google.com/p/sympy/issues/detail?id=3912

O(x) and o(x) work the same for this.

Cancellation can only make things smaller, so that the sum is still O(f(x)). In your example, 1 + x = O(x) is true only for x -> oo, and 1 = O(x) for x -> oo.

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