Status: Started
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 3095 by ronan.l...@gmail.com: Set.contains should behave
symbolically
http://code.google.com/p/sympy/issues/detail?id=3095
ATM, Set.contains is inconsistent in its symbolic vs concrete semantics.
Things like Interval(0 ,1).contains(x) return the expected symbolic result
(x ≥ 0 ∧ x ≤ 1), but FiniteSet(0).contains(x) returns False, which is
inconsistent with the former result. Additionally, the docstring claims
that Set.contains is equivalent to using 'in', which is nonsense since 'in'
is constrained to return a builtin bool.
So, I think that the method should behave in a way that is clearly
symbolic, operating only on sympy objects and returning only sympy objects
(specifically Booleans, when issue 2531 is solved).
Note that this requires in particular that all args of all Sets are
instances of Basic, cf. issue 2070.
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