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NIA reasonning too weak #437

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iguerNL opened this issue Feb 6, 2021 · 0 comments

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iguerNL commented Feb 6, 2021

The following formula is unsat:

(declare-fun s () Int)
(declare-fun y () Int)
(declare-fun th () Int)

(assert (> s 0))
(assert (>= s (+ (* y s) 1)))
(assert (>= (* y s) 10))

(check-sat)

But Alt-Ergo returns "unkown" on it. When asked to produce a model, it loops (in the case-split engine)

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iguerNL mentioned this issue

WIP: make deductions from "a * b / b" if b's interval doesn't contain 0 #438

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