Comment #5 on issue 3536 by [email protected]: float NaN is not resolved
with other numbers
http://code.google.com/p/sympy/issues/detail?id=3536
I think you just need to modify Float to return the symbolic NaN, make sure
the symbolic NaN supports the Float interface (you may need to fiddle with
subclassing), and fix any test failures.
The problem with your solution is 1. I'm not convinced that that will solve
all the issues, and 2. elements of S have a guarantee that they will work
with is comparison, so people will continue to use that, both inside and
outside the library.
By the way, are things equally broken with Float('inf') vs. oo?
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