Published online by Cambridge University Press: 21 July 2014
Extensional higher-order logic programming has been introduced as a generalization of classical logic programming. An important characteristic of this paradigm is that it preserves all the well-known properties of traditional logic programming. In this paper we consider the semantics of negation in the context of the new paradigm. Using some recent results from non-monotonic fixed-point theory, we demonstrate that every higher-order logic program with negation has a unique minimum infinite-valued model. In this way we obtain the first purely model-theoretic semantics for negation in extensional higher-order logic programming. Using our approach, we resolve an old paradox that was introduced by W. W. Wadge in order to demonstrate the semantic difficulties of higher-order logic programming.
This research is being supported by the Greek General Secretariat for Research and Technology, the National Development Agency of Hungary, and the European Commission (European Regional Development Fund) under a Greek-Hungarian intergovernmental programme of Scientific and Technological collaboration. Project title: “Extensions and Applications of Fixed Point Theory for Non-Monotonic Formalisms”. It is also supported by grant no. ANN 110883 from the National Foundation of Hungary for Scientific Research.
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