arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv cs/0207064cs.AIcs.LO
收藏

非单调推理系统的插值定理

Interpolation Theorems for Nonmonotonic Reasoning Systems

Eyal Amir

摘要:

克雷格插值定理(Craig's interpolation theorem,Craig 1957)是命题逻辑和一阶逻辑中的一个重要定理。它说,如果一个逻辑公式$β$在逻辑上从一个公式$α$得出,那么就有一个公式$γ$,只包括出现在两个$α,β$中的符号,这样$β$在逻辑上从$γ$得出,而$γ$在逻辑上从$α$得出。这样的定理对于理解它们所处的逻辑以及加速用这些逻辑中的理论进行推理是重要和有用的。在本文中,我们提出了插值定理在这种精神的三个非单调系统:限制,默认逻辑和逻辑程序的稳定模型语义(a.k.a.)。答案集语义)。这些结果使我们更好地理解这些逻辑,特别是与它们的非单调特性相比。他们认为,一些\emph{monotonicity}原则持有,尽管这些逻辑的经典单调性失败。此外,它们有时允许我们使用这些系统的推理分解方法,可能会增加它们的适用性和易处理性。最后,它们允许我们构建使用这些逻辑的结构化表示。

英文摘要:

Craig's interpolation theorem (Craig 1957) is an important theorem known for propositional logic and first-order logic. It says that if a logical formula $β$ logically follows from a formula $α$, then there is a formula $γ$, including only symbols that appear in both $α,β$, such that $β$ logically follows from $γ$ and $γ$ logically follows from $α$. Such theorems are important and useful for understanding those logics in which they hold as well as for speeding up reasoning with theories in those logics. In this paper we present interpolation theorems in this spirit for three nonmonotonic systems: circumscription, default logic and logic programs with the stable models semantics (a.k.a. answer set semantics). These results give us better understanding of those logics, especially in contrast to their nonmonotonic characteristics. They suggest that some \emph{monotonicity} principle holds despite the failure of classic monotonicity for these logics. Also, they sometimes allow us to use methods for the decomposition of reasoning for these systems, possibly increasing their applicability and tractability. Finally, they allow us to build structured representations that use those logics.

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。

↑