Comment #6 on issue 3095 by ronan.l...@gmail.com: Set.contains should
behave symbolically
http://code.google.com/p/sympy/issues/detail?id=3095
We have the following test:
assert Union(Interval(0,5),
FiniteSet(['Ham'])).intersect(FiniteSet(2,3,4,5,6)) == FiniteSet(2,3,4,5)
which is actually wrong because it assumes that Ham != 6. However,
returning the correct result in all cases isn't trivial and I'm not even
sure how that result should be expressed.
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