Binary Reachability of Timed-register Pushdown Automata and Branching Vector Addition Systems

Binary Reachability of Timed-register Pushdown Automata and Branching Vector Addition Systems
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定时寄存器下推自动机和分支向量加法系统的二进制可达性

DOI:
10.1145/3326161
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发表时间:
2019
影响因子:
0.5
通讯作者:
Clemente L
Clemente L
中科院分区:
计算机科学4区
文献类型:
--
作者:
Clemente L

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定时寄存器下推自动机构成了一个非常有表现力的自动机类,其转换可能涉及状态、输入和具有无限差异的堆栈顶部定时寄存器。它们严格归入了Bouajjani等人的下推时间自动机、Abdulla等人的稠密时间下推自动机以及Clemente和Lasota的轨道有限时间寄存器下推自动机。给出了时间寄存器下推自动机可达性关系的有效逻辑表征。作为推论,我们得到了非空问题的双指数时间过程。我们证明了在时间单调的假设下,复杂度降为单指数。该证明涉及到一个具有状态的一维整数分支向量加法系统的新模型。作为一个有趣的结果,我们证明了后一种模型的可达集是半线性的,在指数时间内可计算。
Timed-register pushdown automata constitute a very expressive class of automata, whose transitions may involve state, input, and top-of-stack timed registers with unbounded differences. They strictly subsume pushdown timed automata of Bouajjani et al., dense-timed pushdown automata of Abdulla et al., and orbit-finite timed-register pushdown automata of Clemente and Lasota. We give an effective logical characterisation of the reachability relation of timed-register pushdown automata. As a corollary, we obtain a doubly exponential time procedure for the non-emptiness problem. We show that the complexity reduces to singly exponential under the assumption of monotonic time. The proofs involve a novel model of one-dimensional integer branching vector addition systems with states. As a result interesting on its own, we show that reachability sets of the latter model are semilinear and computable in exponential time.
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