Updates:
        Blockedon: -sympy:2070 sympy:2070

Comment #11 on issue 3095 by [email protected]: Set.contains should behave symbolically
http://code.google.com/p/sympy/issues/detail?id=3095

Even with sets with only numerical values, we still have the issue that .contains isn't returned symbolically:

In [28]: FiniteSet(1, 2, 3).contains(k)
Out[28]: False

In [29]: Interval(1, 1).contains(k)
Out[29]: False

In [30]: Interval(1, 2).contains(k)  # this one works as it should
Out[30]: And(k >= 1, k <= 2)


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