2003 | OriginalPaper | Buchkapitel
Loop Formulas for Disjunctive Logic Programs
verfasst von : Joohyung Lee, Vladimir Lifschitz
Erschienen in: Logic Programming
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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We extend Clark’s definition of a completed program and the definition of a loop formula due to Lin and Zhao to disjunctive logic programs. Our main result, generalizing the Lin/Zhao theorem, shows that answer sets for a disjunctive program can be characterized as the models of its completion that satisfy the loop formulas. The concept of a tight program and Fages’ theorem are extended to disjunctive programs as well.