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arXiv 1802.00523cs.LOcs.FL
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扩展词方程的可满足性:可判定性与不可判定性的界限

The Satisfiability of Extended Word Equations: The Boundary Between Decidability and Undecidability

Joel Day, Vijay Ganesh, Paul He, Florin Manea, Dirk Nowotka

摘要:

字方程的研究(或自由幺半群上方程的存在理论)是数学和理论计算机科学的中心课题。决定一个给定的词方程是否有解的问题在20世纪70年代末被Makanin证明是可判定的,从那时起,在这个问题上做了大量的工作。近年来,这个可判定性问题在安全分析的字符串SMT求解器的背景下变得至关重要。此外,许多扩展(例如,在长度函数上具有线性算术的无量词字等式)和片段(例如,对变量数目的限制)从理论观点以及对于程序分析应用来说是重要的。出于这些考虑,我们证明了几个新的结果,从而揭示了许多片段和扩展的一阶理论的字方程的可判定性和不可判定性之间的边界。

英文摘要:

The study of word equations (or the existential theory of equations over free monoids) is a central topic in mathematics and theoretical computer science. The problem of deciding whether a given word equation has a solution was shown to be decidable by Makanin in the late 1970s, and since then considerable work has been done on this topic. In recent years, this decidability question has gained critical importance in the context of string SMT solvers for security analysis. Further, many extensions (e.g., quantifier-free word equations with linear arithmetic over the length function) and fragments (e.g., restrictions on the number of variables) of this theory are important from a theoretical point of view, as well as for program analysis applications. Motivated by these considerations, we prove several new results and thus shed light on the boundary between decidability and undecidability for many fragments and extensions of the first order theory of word equations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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