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| Abstract |
Circumscription, which is an important tool for formalizing nonmonotonic aspects of commonsense reasoning, is a minimization on predicate symbols. In this paper, we apply circumscription to logic prog...rams, and compare the semantics of circumscription with the stable model semantics of logic programs. We introduce two syntactical conditions, a minimality condition and a uniqueness condition, which determine how to minimize predicate symbols. We show that each of them also deter mines a unique model of circumscription of a logic program, and each model coincides with a unique stable model of the program as the declarative semantics.show more
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