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The Diagonal Problem for Higher-Order Recursion Schemes is Decidable*

机译:高阶递归方案的对角线问题是可确定的*

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摘要

A non-deterministic recursion scheme recognizes a language of finite trees. This very expressive model can simulate, among others, higher-order pushdown automata with collapse. We show decidability of the diagonal problem for schemes. This result has several interesting consequences. In particular, it gives an algorithm that computes the downward closure of languages of words recognized by schemes. In turn, this has immediate application to separability problems and reachability analysis of concurrent systems.
机译:非确定性递归方案可识别有限树的语言。这个非常有表现力的模型可以模拟具有崩溃的高阶下推自动机。我们显示了方案对角线问题的可判定性。这个结果有几个有趣的结果。特别地,它给出了一种算法,该算法计算方案识别的单词的语言的向下闭合。反过来,这可以立即应用于并发系统的可分离性问题和可达性分析。

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