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(qe) Soundness bug on (assert (forall ((a Int)) (distinct (mod a a) a))) #4104

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muchang opened this issue Apr 26, 2020 · 0 comments
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(qe) Soundness bug on (assert (forall ((a Int)) (distinct (mod a a) a))) #4104

muchang opened this issue Apr 26, 2020 · 0 comments

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@muchang
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muchang commented Apr 26, 2020

Hi,
For this case, Z3 gives an incorrect answer:

[528] % z3 small.smt2 
sat
unsat
[529] % cat small.smt2 
(assert (forall ((a Int)) (distinct (mod a a) a)))
(check-sat)
(check-sat-using qe)
[530] %

OS: Ubuntu 18.04
Commit: 7f1b147
NikolajBjorner added a commit that referenced this issue Apr 27, 2020
@NikolajBjorner
fix #4104
6d4bd37 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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@muchang