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arXiv 1805.03375cs.FL
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真后缀凸正则语言的复杂性

Complexity of Proper Suffix-Convex Regular Languages

Corwin Sinnamon

摘要:

一个语言L是后缀凸的,如果对于任何词u,v,w,只要w和uvw在L中,vw也在L中。后缀凸语言包括左理想语言、后缀闭语言和后缀自由语言,这些语言在以前已经被研究过。在本文中,我们专注于后缀凸语言,不属于任何一个这些类,我们称这样的语言适当的。为了研究这一语言类,我们定义了一个结构称为后缀凸三元系,其特征在于识别后缀凸语言的自动机。我们发现严格的上界逆转,明星,产品,和布尔运算的适当后缀凸语言,我们猜想的最大的语法半群的大小。我们还证明了三个证人流需要满足所有这些界限。

英文摘要:

A language L is suffix-convex if for any words u, v,w, whenever w and uvw are in L, vw is in L as well. Suffix-convex languages include left ideals, suffix-closed languages, and suffix-free languages, which were studied previously. In this paper, we concentrate on suffix-convex languages that do not belong to any one of these classes; we call such languages proper. In order to study this language class, we define a structure called a suffix-convex triple system that characterizes the automata recognizing suffix-convex languages. We find tight upper bounds for reversal, star, product, and boolean operations of proper suffix-convex languages, and we conjecture on the size of the largest syntactic semigroup. We also prove that three witness streams are required to meet all these bounds.

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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