On the Continuity of Gelfond-Lifschitz Operator and Other Applications of Proof-Theory in ASP [chapter]

V. W. Marek, J. B. Remmel
2008 Lecture Notes in Computer Science  
Using a characterization of stable models of logic programs P as satisfying valuations of a suitably chosen propositional theory, called the set of reduced defining equations rΦP , we show that the finitary character of that theory rΦP is equivalent to a certain continuity property of the Gelfond-Lifschitz operator GLP associated with the program P . The introduction of the formula rΦP leads to a double-backtracking algorithm for computation of stable models by reduction to satisfiability of
more » ... tably chosen propositional theories. This algorithm does not use the reduction via loop-formulas as proposed in [LZ02] or its extension proposed in [FLL06]. Finally, we discuss possible extensions of techniques proposed in this paper to the context of cardinality constraints.
doi:10.1007/978-3-540-89982-2_25 fatcat:wjpyvtauo5hlflwqwy5cdm45bq