Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 4009 by randy.he...@clockworklab.net: Incorrect behaviour in
simplify when used with And and Equality
http://code.google.com/p/sympy/issues/detail?id=4009
simplify(And(Equality(a, 2), c))
False
This is obviously incorrect, as the expression would become True if a is
substituted for 2, and c is substituted for any nonzero value.
Even more interesting is the fully symbolic case:
simplify(And(Equality(a, b), c))
And(Or(Not(a), b), Or(Not(b), a), c)
This does not even match the earlier result, as substituting b for 2
reduces it to And(a, c), not False.
Using simplify with just And or just Equality seems to behave correctly.
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