Robustness and closure properties of recognizable languages in adhesive categories

Robustness and closure properties of recognizable languages in adhesive categories
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粘合剂类别中可识别语言的鲁棒性和封闭性

DOI:
10.1016/j.scico.2014.08.006
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发表时间:
2015
期刊:
Sci. Comput. Program.
影响因子:
--
通讯作者:
Sebastian Küpper
Sebastian Küpper
中科院分区:
--
文献类型:
--
作者:
H.J. Sander Bruggink;Barbara König;Sebastian Küpper

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本文研究了由自动机函子定义的粘着范畴中的余span的可识别语言,其中可识别的图语言是一个特例.本文的贡献有三:首先,我们证明了可识别语言的概念是鲁棒的,在这个意义上,半函子,即,不一定保持身份的函子表征可识别的语言。这是通过转换半函子函子的一个过程类似于消除非确定性有限automata.Second,依靠这个结果,我们表明,可识别的语言是封闭的级联下,即根据cosspan组成,通过提供一个具体的建设,创建一个级联自动机从两个给定的自动机。该构造比有限自动机的相应构造复杂得多。最后给出了Kleene星星和代换的负闭包性质。
We consider recognizable languages of cospans in adhesive categories defined via automaton functors, of which recognizable graph languages are a special case.There are three contributions in this paper: we first show that the notion of recognizable languages is robust in the sense that also semi-functors, i.e., functors that do not necessarily preserve identities, characterize recognizable languages. This is done by converting semi-functors to functors with a procedure akin to epsilon elimination for non-deterministic finite automata.Second, relying on this result, we show that recognizable languages are closed under concatenation, i.e. under cospan composition, by providing a concrete construction that creates a concatenation automaton from two given automata. The construction is considerably more complex than the corresponding construction for finite automata. We conclude by showing negative closure properties for Kleene star and substitution.
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