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Justifications and blocking sets in a rule-based answer set computation. (English) Zbl 1428.68090
Carro, Manuel (ed.) et al., Technical communications of the 32nd international conference on logic programming, ICLP 2016, October 16–21, 2016, New York, NY, USA. Wadern: Schloss Dagstuhl – Leibniz Zentrum für Informatik. OASIcs – OpenAccess Ser. Inform. 52, Article 6, 15 p. (2016).
Summary: Notions of justifications for logic programs under answer set semantics have been recently studied for atom-based approaches or argumentation approaches. The paper addresses the question in a rule-based answer set computation: the search algorithm does not guess on the truth or falsity of an atom but on the application or non application of a non monotonic rule. In this view, justifications are sets of ground rules with particular properties. Properties of these justifications are established; in particular the notion of blocking set (a reason incompatible with an answer set) is defined, that permits to explain computation failures. Backjumping, learning, debugging and explanations are possible applications.
For the entire collection see [Zbl 1407.68025].
68N17 Logic programming
Full Text: DOI
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