Pedro Cabalar and Paolo Ferraris
In this paper we show that an arbitrary propositional theory, when interpreted under the answer sets semantics (called Equilibrium Logic for this general syntax), can always be reexpressed as a strongly equivalent disjunctive logic program, possibly with negation in the head. We provide two different proofs for this result: one involving a syntactic trasnformation, and one that constructs a program starting from the countermodels of the theory in the intermediate logic of here-and-there.
Theory and Practice of Logic Programming, Vol. 7 (2007), pp. 745-759.

Paolo Ferraris Ph.D. Alumni pieffe8 [at] gmail com