Comment #8 on issue 1688 by [email protected]: Functions should be objects
http://code.google.com/p/sympy/issues/detail?id=1688
I've more or less abandoned the idea of using the design from #c2. Having two classes (exp and _exp) for the same concept seems too confusing and cumbersome. I'd rather merge some of the implementation of predicates with functions, and see where that leads.
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