Allen P. Courtney

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The aim of this paper is to describe the algorithmic foundations of the part of the program Exten responsible for the computation of extensions in Constrained Default Logic. Exten is a system that computes extensions for various default logics. The eeciency of the system is increased by pruning techniques for the search tree. We motivate and present these(More)
In a recent paper Jun Arima formalises the idea of preduc-tion { a non-monotonic schema providing a common basis for inductive and analogical reasoning. We examine some of the implications of this schema, as well as its connections with prototypes and conceptual spaces. A generalised version of his schema is motivated and developed to address diiculties(More)
Default logic [3] is a useful formalism for reasoning with incomplete information, its intuitive characteristics making it particularly suited for applications. Exten is a system currently capable of computing firstorder Reiter, Justified and Constrained default extensions. It is part of a project to create a full default logic workbench, with future work(More)
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