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arXiv 2102.06495cs.LO
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关于符号签名与良基语义

On Signings and the Well-Founded Semantics

Michael J. Maher

AI总结:

本文利用Kunen的符号签名概念,证明了关于逻辑程序良基语义的两个定理,分别刻画了良基语义与Fitting语义在谓词正部分上的一致性,以及签名条件下计算正部分仅需每个谓词的一个部分,并为查询回答提供了分析思路。

摘要:

在本文中,我们利用Kunen的符号签名概念,针对仅关注程序某个谓词$p$的正文字(例如,作为程序结论的正文字)的情形,建立了关于逻辑程序良基语义的两个定理。第一个定理刻画了一类程序,对于这类程序,良基语义与Fitting语义在$p$的正部分上是一致的。第二个定理表明,如果一个程序具有符号签名,那么在良基语义下计算$p$的正部分仅需计算每个谓词的一个部分。该定理为良基语义下的查询回答提供了一种分析思路。在证明这些结果的过程中,我们使用了逻辑程序良基语义的一种替代表述,该表述可能具有独立的研究价值。本文正在考虑发表于《逻辑程序设计与实践理论》(Theory and Practice of Logic Programming, TPLP)。

英文摘要:

In this note, we use Kunen's notion of a signing to establish two theorems about the well-founded semantics of logic programs, in the case where we are interested in only (say) the positive literals of a predicate $p$ that are consequences of the program. The first theorem identifies a class of programs for which the well-founded and Fitting semantics coincide for the positive part of $p$. The second theorem shows that if a program has a signing then computing the positive part of $p$ under the well-founded semantics requires the computation of only one part of each predicate. This theorem suggests an analysis for query-answering under the well-founded semantics. In the process of proving these results, we use an alternative formulation of the well-founded semantics of logic programs, which might be of independent interest. Under consideration in Theory and Practice of Logic Programming (TPLP)

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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