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arXiv 1810.02471cs.FLcs.LO
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有限并发自动机的开折

Unfolding of Finite Concurrent Automata

Alexandre Mansard

摘要:

我们考虑可识别的跟踪重写系统与水平正规上下文(RTL)。如果一个跟踪语言的元素的Foata范式集合是正则的,则该跟踪语言是水平正则的。我们证明了RTL的重写图是字自动的。因此,它的一阶理论是可判定的。然后,我们证明了具有可达关系的有限并发自动机的并发开折是RTL图。由此可见,具有这种展开的可达性谓词(FO[Reach]理论)的一阶理论是可判定的。据了解,这一性质也适用于地面项重写图。我们提供了有限并发自动机的并发展开失败的地面长期重写图的例子。无限网格树(对于无限网格的每个顶点,都有一条从该顶点到无限网格副本原点的边)就是这样一种展开。我们证明了无限格树不是基项重写图。我们由此得到了一类新的具有可判定FO[Reach]理论的图.

英文摘要:

We consider recognizable trace rewriting systems with level-regular contexts (RTL). A trace language is level-regular if the set of Foata normal forms of its elements is regular. We prove that the rewriting graph of a RTL is word-automatic. Thus its first-order theory is decidable. Then, we prove that the concurrent unfolding of a finite concurrent automaton with the reachability relation is a RTL graph. It follows that the first-order theory with the reachability predicate (FO[Reach] theory) of such an unfolding is decidable. It is known that this property holds also for the ground term rewriting graphs. We provide examples of finite concurrent automata of which the concurrent unfoldings fail to be ground term rewriting graphs. The infinite grid tree (for each vertex of an infinite grid, there is an edge from this vertex to the origin of a copy of the infinite grid) is such an unfolding. We prove that the infinite grid tree is not a ground term rewriting graph. We have thus obtained a new class of graphs for with a decidable FO[Reach] theory.

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