Foundations of logic programming; (2nd extended ed.)
Foundations of logic programming; (2nd extended ed.)
Logic programs with classical negation
Logic programming
Handbook of theoretical computer science (vol. B)
Complexity of recursive normal default logic
Fundamenta Informaticae - Special issue: to the memory of Prof. Cecylia Rauszer
Domains for Denotational Semantics
Proceedings of the 9th Colloquium on Automata, Languages and Programming
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FC-normal logic programs are a generalization by Marek, Nerode, and Remmel of Reiter's normal default theories. They have the property that, unlike most logic programs, they are guaranteed to have simple stable models. In this paper it is shown that the problem of skeptical reasoning in FC-normal programs is Π^1_1-complete, the same complexity as for logic programs without the restriction of FC-normality. FC-normal programs are defined in such a way as to make testing a program for FC-normality very difficult in general. A large subclass of FC-normal programs, locally FC-normal programs, is defined, shown to be recursive, and shown to have skeptical consequence as expressive as the entire class of FC-normal programs.