Z3

How to print z3 solver results print(s.model()) in order?

由 好久不见. 提交于 2020-02-25 21:33:36
问题 Suppose I have a list of 10 variables v = [Real('v_%s' % (i+1)) for i in range(10)] and I want to add a simple constraint like this s = Solver() for i in range(10): s.add(v[i] == i) if s.check() == sat: print(s.model()) So a satisfying model is v_1 = 0, v_2 = 1 .... v_10 = 9 . However the output of print(s.model()) is totoally unordered which makes me confused when I have lots of variables in a bigger model. For this example, the output of my computer is v_5, v_7, v_4, v_2, v_1, v_3, v_6, v_8

how I can to know how many values have a array in z3?

由 可紊 提交于 2020-02-25 04:19:45
问题 I am using Z3py but when I define a array array = Array('array', IntSort(), IntSort()) I don't know how I can to know how many values have the array. 回答1: Arrays in Z3 (and in SMT) are of unbounded size. See, for instance, Create an array with fixed size and initialize it 来源： https://stackoverflow.com/questions/59731478/how-i-can-to-know-how-many-values-have-a-array-in-z3

how I can to know how many values have a array in z3?

由 穿精又带淫゛_ 提交于 2020-02-25 04:18:33
问题 I am using Z3py but when I define a array array = Array('array', IntSort(), IntSort()) I don't know how I can to know how many values have the array. 回答1: Arrays in Z3 (and in SMT) are of unbounded size. See, for instance, Create an array with fixed size and initialize it 来源： https://stackoverflow.com/questions/59731478/how-i-can-to-know-how-many-values-have-a-array-in-z3

z3学习篇（二）——— example.cpp的运行及环境配置

由 限于喜欢 提交于 2020-01-28 19:57:28
1、启动VS2017，创建新项目： 2、找到你z3-master下的example.cpp所在位置，把它复制粘贴到创建好的项目源文件下： 3、此时会有提示，说存在很多错误，其实是因为还没有为其配环境，那么接下来我们就来配置环境啦： 4、点击"配置管理器"（我自己做的时候是让它们都处于64位环境）： 5、VC++目录---->包含目录（把z3-master/src/api 和 z3-master/src/api/c++ 都添加进去），这两个目录里有要用到的.h头文件 VC++目录---->库目录（把z3-master/build添加进去） 6、调试---->环境（找到libz3.dll所在目录z3-master/build，将z3-master/build添加到环境中）： 7、链接器---->输入---->附加依赖项（将libz3.lib; 添加进去）： 8、最后，把libz3.dll文件粘贴到该项目中： 9、调试代码，可成功运行： 来源： CSDN 作者： 08042在不在 链接： https://blog.csdn.net/weixin_42442802/article/details/104100440

Z3 support for nonlinear arithmetic

由 ぃ、小莉子 提交于 2020-01-26 21:06:07
问题 I understand that Z3 has some supports for nonlinear arith but wondering to what extends ? Is it possible to specify what classes of nonlinear arithmetics are supported and are not (or likely to give time out) ? Know these in advances will help me abort my task early. Seems like power related stuff is not supported as shown below def pow2(x): k=Int('k') return Exists(k, And(k>=0,2**k==x)) prove(pow2(7)) failed to prove 回答1: Z3 supports nonlinear polynomial Real arithmetic. So, there is no

Z3 support for nonlinear arithmetic

由 青春壹個敷衍的年華 提交于 2020-01-26 21:05:07
问题 I understand that Z3 has some supports for nonlinear arith but wondering to what extends ? Is it possible to specify what classes of nonlinear arithmetics are supported and are not (or likely to give time out) ? Know these in advances will help me abort my task early. Seems like power related stuff is not supported as shown below def pow2(x): k=Int('k') return Exists(k, And(k>=0,2**k==x)) prove(pow2(7)) failed to prove 回答1: Z3 supports nonlinear polynomial Real arithmetic. So, there is no

Executing get-model or unsat-core depending on solver's decision

由 只愿长相守 提交于 2020-01-23 10:42:51
问题 I wonder, if there is a possibility in a SMT-LIB 2.0 script to access the last satisfiability decision of a solver (sat, unsat, ...). For example, the following code: (set-option :produce-unsat-cores true) (set-option :produce-models true) (set-logic QF_UF) (declare-fun p () Bool) (declare-fun q () Bool) (declare-fun r () Bool) (assert (! (=> p q) :named PQ)) (assert (! (=> q r) :named QR)) (assert (! (not (=> p r)) :named nPR)) (check-sat) (get-model) (get-unsat-core) ran in Z3 returns:

Is there an UnsignedIntSort in Z3?

由 我怕爱的太早我们不能终老 提交于 2020-01-21 15:15:52
问题 I am using functions in my solver to model discrete time. The problem is that right now we use functions like z3.Function('f', IntSort(), IntSort()) and negative input values to the functions is really not applicable here because time starts at t=0. This causes problems when I want to proove things because the solver finds negative time solutions that should not be considered at all. So my question is: Is there some kind of unsigned int sort ( UnsignedIntSort ) in z3? 回答1: As pointed out in

Z3 real arithmetic and statistics

由 耗尽温柔 提交于 2020-01-20 08:43:24
问题 Given a problem that is encoded using Z3's reals, which of the statistics that Z3 /smt2 /st produces might be helpful in order to judge if the reals engine "has problems/does lots of work"? In my case, I have two mostly equivalent encodings of the problem, both using reals. The "small" difference in the encoding, however, makes a big difference in runtime, namely, that encoding A takes 2:30min and encoding B 13min. The Z3 statistics show that conflicts and quant-instantiations are mostly

Z3 complains that assumption is not a propositional variable, even when it actually is

由 本小妞迷上赌 提交于 2020-01-17 02:41:07
问题 I'm using the Java API. This is a minimal working example for this warning: HashMap<String, String> cfg = new HashMap<String, String>(); cfg.put("model", "true"); Context ctx = new Context(cfg); Solver solver = ctx.mkSolver(); BoolExpr a = ctx.mkBoolConst("a"); BoolExpr b = ctx.mkBoolConst("b"); BoolExpr and = ctx.mkAnd(a,b); solver.check(and); For this small program, Z3 complained that: WARNING: an assumption must be a propositional variable or the negation of one Unless I misunderstood
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