Comment #14 on issue 3095 by asmeu...@gmail.com: Set.contains should behave symbolically
http://code.google.com/p/sympy/issues/detail?id=3095
I personally think .contains should return its own kind of symbolic object, which doesn't necessarily replace as_relational. They both could be useful, depending on whether you want to use a set abstraction or a relational abstraction. Also, not all sets can be represented as relationals.
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