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arXiv 1206.4564cs.LOcs.CC
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依赖逻辑的计算方面

Computational Aspects of Dependence Logic

Peter Lohmann

摘要:

本文主要研究模态依赖逻辑.它是由Jouko Vääanänen在2007年引入的,作为一阶的扩展(分别为。模态)逻辑的依赖运算符=()。一阶(resp.)命题)变量x_1,...,x_n,=(x_1,...,x_n)直观地说明x_n的值由x_1,.,x_n-1。我们认为片段的模态依赖逻辑通过限制允许模态和命题连接词的集合。我们对这些片段的可满足性和模型检查问题的复杂性进行了分类。对于可满足性,我们获得了从P over NP,Sigma_P^2和PSPACE到NEXP的复杂度,而对于模型检查,我们只根据它们的易处理性对片段进行分类,即我们在P中显示NP-完全性或包含性。对于这个扩展,我们再次分类的复杂性模型检查问题的片段。在这里,我们获得了从P over NP和coNP到PSPACE的复杂度。最后,我们分析了一阶依赖逻辑、独立友好逻辑及其二元片段。我们证明了两个变量的依赖逻辑的可满足性是NEXP-完全的,而两个变量的独立友好的逻辑,它是不可判定的,并使用这一点来证明,后者也比前者更有表现力。

英文摘要:

In this thesis (modal) dependence logic is investigated. It was introduced in 2007 by Jouko Vääanänen as an extension of first-order (resp. modal) logic by the dependence operator =(). For first-order (resp. propositional) variables x_1,...,x_n, =(x_1,...,x_n) intuitively states that the value of x_n is determined by those of x_1,...,x_n-1. We consider fragments of modal dependence logic obtained by restricting the set of allowed modal and propositional connectives. We classify these fragments with respect to the complexity of their satisfiability and model-checking problems. For satisfiability we obtain complexity degrees from P over NP, Sigma_P^2 and PSPACE up to NEXP, while for model-checking we only classify the fragments with respect to their tractability, i.e. we either show NP-completeness or containment in P. We then study the extension of modal dependence logic by intuitionistic implication. For this extension we again classify the complexity of the model-checking problem for its fragments. Here we obtain complexity degrees from P over NP and coNP up to PSPACE. Finally, we analyze first-order dependence logic, independence-friendly logic and their two-variable fragments. We prove that satisfiability for two-variable dependence logic is NEXP-complete, whereas for two-variable independence-friendly logic it is undecidable; and use this to prove that the latter is also more expressive than the former.

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