Comment #12 on issue 2107 by smi...@gmail.com: Real(0.1, 10) - Real(0.1, 10) -> 3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107

http://code.google.com/p/sympy/issues/detail?id=2107#c3 may be helpful in getting

    s=sqrt(3)
    s.n(2) - s.n(2)

to give 0

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