证明了命题控制动态逻辑DL-PA和命题控制委托联合逻辑DCL-PC的模型检验和可满足性问题都是在PSPACE中进行的。我们解释了为什么(Balbiani,Herzig,Troquard,2013)中提出的DL-PA的模型检验问题的EXPTIME-硬度证明是错误的。我们还解释了为什么在PSPACE的成员证明的模型检验问题的DCL-PC(van der Hoek,Walther,Wooldridge,2010)是错误的。
英文摘要:
We prove that the model checking and the satisfiability problem of both Dynamic Logic of Propositional Assignments DL-PA and Coalition Logic of Propositional Control and Delegation DCL-PC are in PSPACE. We explain why the proof of EXPTIME-hardness of the model checking problem of DL-PA presented in (Balbiani, Herzig, Troquard, 2013) is false. We also explain why the proof of membership in PSPACE of the model checking problem of DCL-PC given in (van der Hoek, Walther, Wooldridge, 2010) is wrong.
Characterizing the NP-PSPACE Gap in the Satisfiability Problem for Modal Logic
关于模态逻辑的可满足性和有效性问题的复杂性刻画,已有大量的工作。特别地,Ladner证明了K、T和S4之间的所有逻辑的有效性问题是{ \sl PSPACE}-完全的,而对于S5则是{ \sl NP}-完全的。我们表明,在一个精确的意义上,这是\emph{negative introspection},公理$\neg K p \rimp K \neg K p$,造成的差距。在精确的意义上,如果我们需要这个公理,那么可满足性问题是{ \sl NP}-完全的;没有它,它是{ \sl PSPACE}-完全的。
Complexity Jumps In Multiagent Justification Logic Under Interacting Justifications
证明逻辑(英语:Logic of Proofs),LP,及其后继者,证明逻辑(英语:Justification Logic),是模态逻辑对认识论方法的一种改进,其中考虑了证明/证明。在2000年,库兹涅茨证明了LP的可满足性是在多项式层次的第二层,这一结果已经成功地重复了所有其他单智能体证明逻辑的复杂性是已知的。我们引入了一个家庭的多代理的理由逻辑与代理之间的相互作用的理由,通过扩展和推广的两个代理版本的证明的逻辑Yavorskaya在2008年。对于这种多代理的情况,调整了来自单代理调整设置的已知概念和工具。我们目前的Tableau规则和一些初步的复杂性结果。在某些情况下,这些逻辑的可满足性问题仍然在多项式层次的第二层,而对于其他人来说,它是PSPACE或EXP-hard。此外,这个问题变得PSPACE硬,即使某些两个代理逻辑,而有三个代理的EXP硬逻辑。
对于布尔可满足性问题,解空间的结构由解图表征,其中顶点是解,并且两个解连通当且仅当它们在一个变量上不同。对于这个隐式定义的图,我们在这里研究st-连通性和连通性问题。基于Gopalan et al.(“The Connectivity of Boolean Satisfiability:Computational and Structural Dichotomies”,2006/2009),我们首先研究了由CSP给出的可满足性问题,更确切地说是由带常数的CNF(S)-公式给出的可满足性问题(如Schaefer在1978年著名的二分法定理中所考虑的);我们证明了ST-连通性问题的计算二分法,断言它要么在多项式时间内可解,要么是PSPACE-完全的,并且是对齐的结构二分法,断言,连接组件的最大直径是线性的变量的数量,或者可以是指数;此外,我们显示了一个连通性问题的剖分,断言它是在P,CONP-完全,或PSPACE-完全。接下来,我们调查两个重要的变种:CNF(S)-公式没有常数,部分量化的公式;在这两种情况下,我们证明了类似的二分法的ST-连接和直径;对于连接问题,我们显示了一个二分法的情况下,量化的公式,而在没有常数的公式的情况下,我们确定一个可能的二分法的片段。最后,我们考虑B-公式的连通性问题,这是任意嵌套的公式建立从一些固定的连接词集B,和B-电路,这是布尔电路的门是从一些有限…
We extend dynamic logic of propositional assignments by adding an operator of parallel composition that is inspired by separation logics. We provide an axiomatisation via reduction axioms, thereby establishing decidability. We also prove that the complexity of both the model checking and the satisfiability problem stay in PSPACE.
Stochastic Boolean Satisfiability (SSAT) is a logical formalism to model decision problems with uncertainty, such as Partially Observable Markov Decision Process (POMDP) for verification of probabilistic systems. SSAT, however, is limited by its descriptive power within the PSPACE complexity class. More complex problems, such as the NEXPTIME-complete Decentralized POMDP (Dec-POMDP), cannot be succinctly encoded with SSAT. To provide a logical formalism of such problems, we extend the Dependency Quantified Boolean Formula (DQBF), a representative problem in the NEXPTIME-complete class, to its s…
University of Tübingen(蒂宾根大学);Institut für Theoretische Informatik, Leibniz Universität Hannover(汉诺威莱布尼茨大学理论计算机科学研究所);School of Computing Science, University of Glasgow(格拉斯哥大学计算科学学院);Department of Computer Science, Aalborg University(奥尔堡大学计算机系)
The choice of the right trade-off between expressiveness and complexity is the main issue in interval temporal logic. In their seminal paper, Halpern and Shoham showed that the satisfiability problem for HS (the temporal logic of Allen's relations) is highly undecidable over any reasonable class of linear orders. In order to recover decidability, one can restrict the set of temporal modalities and/or the class of models. In the following, we focus on the satisfiability problem for HS fragments under the homogeneity assumption, according to which any proposition letter holds over an interval if…
模态依赖逻辑最近由Väänänen引入。它通过操作符=()增强了基本模态语言。对于命题变量p_1,.,p_n,=(p_1,...,p_(n-1);p_n)直观地说明p_n的值由p_1,.,p_(n-1)。Sevenster(J. Logic and Computation,2009)表明,对于非确定性指数时间,模态依赖逻辑的可满足性是完全的。在本文中,我们考虑片段的模态依赖逻辑得到的限制允许命题连接词的集合。我们证明了穷人依赖逻辑的可满足性,这种语言由使用合取、必要性和可能性(即,不允许分离),保持NEXPTIME-完全。如果我们只允许单调公式(没有否定,但有析取),复杂性下降到PSPACE完全性。我们还扩展了Väänänen的语言,允许经典的析取除了依赖析取,并表明可满足性问题仍然是NEXPTIME完全的。如果我们不允许否定和依赖析取,那么对于多项式层次的第二层来说,可满足性是完全的。通过这种方式,我们对Väänänen和Sevenster考虑的命题和依赖运算符的所有限制的可满足性问题的计算复杂性进行了完全分类。
Satisfiability of word equations is an important problem in the intersection of formal languages and algebra: Given two sequences consisting of letters and variables we are to decide whether there is a substitution for the variables that turns this equation into true equality of strings. The exact computational complexity of this problem remains unknown, with the best lower and upper bounds being, respectively, NP and PSPACE. Recently, the novel technique of recompression was applied to this problem, simplifying the known proofs and lowering the space complexity to (nondeterministic) O(n log n…