Comment #2 on issue 3536 by colleenc...@gmail.com: float NaN is not resolved with other numbers
http://code.google.com/p/sympy/issues/detail?id=3536
Filed this separately because issue 3028 seems to be about either (1) appearance when printing or (2) merging them as entities entirely. My suggestion would be to replace every check for "x is S.NaN" with "x.isNaN()" where said method checks if x is symbolic NaN or float NaN. In other words, fnan would still exist, but special-case code for operators, etc. would handle it the same way symbolic NaN is handled.
If that's an appropriate solution, I'll file a pull request for this tomorrow.
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