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arXiv 1106.0233cs.AI
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命题知识表示形式的空间效率

Space Efficiency of Propositional Knowledge Representation Formalisms

Politecnico di Bari(巴里理工大学)

M. Cadoli, F. M. Donini, P. Liberatore, M. Schaerf

摘要:

我们研究了一个命题知识表示(PKR)形式主义的空间效率。直觉,一个形式F在表示某个知识A时的空间效率,是F中表示A的最短公式的大小。在本文中,我们假设知识是一组命题解释(模型)或一组命题公式(定理)。我们提供了一种正式的方式来讨论PKR形式主义紧凑地表示一组模型或一组定理的相对能力。我们引入了两个新的紧凑性措施,相应的类,并表明PKR形式主义在表示模型/定理的相对空间效率是直接关系到这样的类。特别是,我们认为形式主义的非单调推理,如界限和默认逻辑,以及信念修正算子和稳定的模型语义的逻辑程序否定。一个有趣的结果是,具有相同时间复杂度的形式主义不一定属于相同的空间效率类。

英文摘要:

We investigate the space efficiency of a Propositional Knowledge Representation (PKR) formalism. Intuitively, the space efficiency of a formalism F in representing a certain piece of knowledge A, is the size of the shortest formula of F that represents A. In this paper we assume that knowledge is either a set of propositional interpretations (models) or a set of propositional formulae (theorems). We provide a formal way of talking about the relative ability of PKR formalisms to compactly represent a set of models or a set of theorems. We introduce two new compactness measures, the corresponding classes, and show that the relative space efficiency of a PKR formalism in representing models/theorems is directly related to such classes. In particular, we consider formalisms for nonmonotonic reasoning, such as circumscription and default logic, as well as belief revision operators and the stable model semantics for logic programs with negation. One interesting result is that formalisms with the same time complexity do not necessarily belong to the same space efficiency class.

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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