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arXiv 1906.08027cs.FL
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从可判定性到不可判定性的正则集考虑

From Decidability to Undecidability by Considering Regular Sets of Instances

Petra Wolf

摘要:

我们将经典问题从单个实例提升到规则的实例集。在一个潜在无限的给定正则集中寻找组合问题$P$的正例的任务等价于$P$的整数问题,它要求给定的DFA $A$,$P$与$L(A)$的交集是否非空.整数问题概括了同时考虑多个实例的思想,并将经典的组合问题与自动机理论领域联系起来。虽然intreg问题的可判定性问题已经在一些NP-甚至PSPACE-完全问题中得到了积极的回答,但我们提出的自然问题甚至来自L,具有不可判定的intreg问题。我们还讨论了字母表的大小和不同的编码方案,阐述了问题之间的边界,分别与一个不可判定的intreg问题的变种。

英文摘要:

We are lifting classical problems from single instances to regular sets of instances. The task of finding a positive instance of the combinatorial problem $P$ in a potentially infinite given regular set is equivalent to the so called intreg-problem of $P$, which asks for a given DFA $A$, whether the intersection of $P$ with $L(A)$ is non-empty. The intreg-problem generalizes the idea of considering multiple instances at once and connects classical combinatorial problems with the field of automata theory. While the question of the decidability of the intreg-problem has been answered positively for several NP- and even PSPACE-complete problems, we are presenting natural problems even from L with an undecidable intreg-problem. We also discuss alphabet sizes and different encoding-schemes elaborating the boundary between problem-variants with a decidable respectively undecidable intreg-problem.

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