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Greibach Normal Form for omega-Algebraic Systems and Weighted Simple omega-Pushdown Automata

机译:欧米伽-代数系统的Greibach范式和加权的简单欧米伽-推下自动机

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In weighted automata theory, many classical results on formal languages have been extended into a quantitative setting. Here, we investigate weighted context-free languages of infinite words, a generalization of omega-context-free languages (Cohen, Gold 1977) and an extension of weighted context-free languages of finite words (Chomsky, Sch??tzenberger 1963). As in the theory of formal grammars, these weighted languages, or omega-algebraic series, can be represented as solutions of mixed omega-algebraic systems of equations and by weighted omega-pushdown automata. In our first main result, we show that mixed omega-algebraic systems can be transformed into Greibach normal form. Our second main result proves that simple omega-reset pushdown automata recognize all omega-algebraic series that are a solution of an omega-algebraic system in Greibach normal form. Simple reset automata do not use epsilon-transitions and can change the stack only by at most one symbol. These results generalize fundamental properties of context-free languages to weighted languages.
机译:在加权自动机理论中,关于形式语言的许多经典结果已扩展到定量设置中。在这里,我们研究了无穷词的加权无上下文语言,无ω语言的泛化(Cohen,Gold 1977)和无词加权无上下文语言的扩展(Chomsky,Sch?tzenberger 1963)。像形式语法理论中一样,这些加权语言或欧米伽-代数级数可以表示为方程式的混合欧米伽-代数系统的解,也可以表示为欧米伽-下推加权自动机。在我们的第一个主要结果中,我们证明了混合的欧米-代数系统可以转化为Greibach正规形式。我们的第二个主要结果证明,简单的omega-reset下推自动机可以识别所有Greibach正规形式的omega-algebraic系统解决方案的omega-algebraic系列。简单的重置自动机不使用epsilon转换,最多只能更改一个符号来更改堆栈。这些结果将无上下文语言的基本属性推广到加权语言。

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