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arXiv 1104.3055cs.FLcs.GT
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概率不漏自动机值1的判定问题

Deciding the Value 1 Problem of Probabilistic Leaktight Automata

Nathanaël Fijalkow, Hugo Gimbert, Youssouf Oualhadj

摘要:

值1问题是有限词上的概率自动机的一个判定问题:给定一个概率自动机A,是否存在A以任意接近1的概率接受的词?这个问题最近被证明是不可判定的。我们锐化这一结果,表明不可判定性的结果,即使概率自动机只有一个概率的过渡。我们的主要贡献是引入一类新的概率自动机,称为leaktight自动机,其中值1的问题是可判定的(和PSPACE完全)。我们构造了一个算法的基础上计算的幺半群抽象的行为的自动机,并依靠代数技术开发的西蒙的正确性证明。类的leaktight自动机是可判定的PSPACE,包括所有子类的概率自动机的值1的问题是已知的可判定的(特别是确定性自动机),并关闭下两个自然的组合算子。

英文摘要:

The value 1 problem is a decision problem for probabilistic automata over finite words: given a probabilistic automaton A, are there words accepted by A with probability arbitrarily close to 1? This problem was proved undecidable recently. We sharpen this result, showing that the undecidability result holds even if the probabilistic automata have only one probabilistic transition. Our main contribution is to introduce a new class of probabilistic automata, called leaktight automata, for which the value 1 problem is shown decidable (and PSPACE-complete). We construct an algorithm based on the computation of a monoid abstracting the behaviours of the automaton, and rely on algebraic techniques developed by Simon for the correctness proof. The class of leaktight automata is decidable in PSPACE, subsumes all subclasses of probabilistic automata whose value 1 problem is known to be decidable (in particular deterministic automata), and is closed under two natural composition operators.

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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