Journal of Symbolic Logic 66 (2):517 - 535 (2001)

Authors
Harrie De De Swart
Erasmus University Rotterdam
Abstract
We introduce an implication-with-possible-exceptions and define validity of rules-with-possible-exceptions by means of the topological notion of a full subset. Our implication-with-possible-exceptions characterises the preferential consequence relation as axiomatized by Kraus, Lehmann and Magidor [Kraus, Lehmann, and Magidor, 1990]. The resulting inference relation is non-monotonic. On the other hand, modus ponens and the rule of monotony, as well as all other laws of classical propositional logic, are valid-up-to-possible exceptions. As a consequence, the rules of classical propositional logic do not determine the meaning of deducibility and inference as implication-without-exceptions
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DOI 10.2307/2695029
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References found in this work BETA

Five Faces of Minimality.David Makinson - 1993 - Studia Logica 52 (3):339 - 379.
Efficient Reasoning About Rich Temporal Domains.Yoav Shoham - 1988 - Journal of Philosophical Logic 17 (4):443 - 474.

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