Comment #4 on issue 2878 by ondrej.c...@gmail.com: numerical evaluation problem
http://code.google.com/p/sympy/issues/detail?id=2878
One more comment: This should be investigated in systems like Maple and Mathematica, to see whether they treat 0.6 as a floating point (no matter what precision, it will never be exactly precise), or as an exact number by default. That is what S("0.6") should do.
One can always distinguish the two cases explicitly by Float("0.6") and Rational("0.6").
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