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The complexity of regular abstractions of one-counter languages

机译:一站式语言的常规抽象的复杂性

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We study the computational and descriptional complexity of the following transformation: Given a one-counter automaton (OCA) A, construct a nondeterministic finite automaton (NFA) 13 that recognizes an abstraction of the language G(A): its (1) downward closure, (2) upward closure, or (3) Parikh image. For the Parikh image over a fixed alphabet and for the upward and downward closures, we find polynomial-time algorithms that compute such an NFA. For the Parikh image with the alphabet as part of the input, we find a quasi-polynomial time algorithm and prove a completeness result: we construct a sequence of OCA that admits a polynomial-time algorithm iff there is one for all OCA. For all three abstractions, it was previously unknown whether appropriate NFA of sub-exponential size exist.
机译:我们研究以下转换的计算和描述复杂度:给定一个单计数器自动机(OCA)A,构造一个可识别语言G(A)的抽象的不确定性有限自动机(NFA)13:(1)向下闭合,(2)向上闭合或(3)Parikh图像。对于固定字母表上的Parikh图像以及向上和向下的闭合,我们发现了可计算此类NFA的多项式时间算法。对于以字母作为输入一部分的Parikh图像,我们找到了一个拟多项式时间算法并证明了完整性结果:如果所有OCA都有一个,则构造一个允许多项式时间算法的OCA序列。对于所有三个抽象,以前都不知道是否存在适当的亚指数大小的NFA。

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