z3/python 实数 [英] z3/python reals

问题描述

使用 z3/python 网络界面，如果我问:

With the z3/python web interface, if I ask:

x = Real ('x')
solve(x * x == 2, show=True)

我很清楚:

Problem:
[x·x = 2]
Solution:
[x = -1.4142135623?]

我认为以下 smt-lib2 脚本会有相同的解决方案:

I thought the following smt-lib2 script would have the same solution:

(set-option :produce-models true)
(declare-fun s0 () Real)
(assert (= 2.0 (* s0 s0)))
(check-sat)

唉，我在 z3 (v3.2) 中得到 unknown.

Alas, I get unknown with z3 (v3.2).

我怀疑问题出在非线性项 (* s0 s0) 上，python 接口不知何故不受此影响.有没有办法在 smt-lib2 中编写相同的代码来获得模型?

I suspect the problem is with the non-linear term (* s0 s0), which the python interface somehow doesn't suffer from. Is there a way to code the same in smt-lib2 to get a model?

推荐答案

将 您的示例与 Z3 web 一起尝试界面，我得到sat的结果.

Try your example with Z3 web interface, I get a result of sat.

Z3 网页界面和 Z3Py 基于 Z3 v4.0，所以我认为这个问题在即将发布的版本中得到解决.

Z3 web interface and Z3Py are based on Z3 v4.0, so I think the problem is fixed in the upcoming release.

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