Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Assumptions
New issue 3633 by mrock...@gmail.com: Contradictory assumptions should
raise error
http://code.google.com/p/sympy/issues/detail?id=3633
In [1]: Q.positive(x) & Q.negative(x)
Out[1]: Q.negative(x) ∧ Q.positive(x)
In [2]: ask(Q.positive(x), Q.positive(x) & Q.negative(x))
Out[2]: True
In [3]: ask(Q.negative(x), Q.positive(x) & Q.negative(x))
Out[3]: True
Line 1 should raise an error. This is a simple example and probably has a
simple solution. There are likely more complex cases.
Is this a solvable problem in general?
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