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Show simple item record Britz, K Varzinczak, I 2019-03-07T12:12:58Z 2019-03-07T12:12:58Z 2018-03
dc.identifier.citation Britz, K. and Varzinczak, I. 2018. From KLM-style conditionals to defeasible modalities, and back. Journal of Applied Non-Classical Logics, vol. 28(1): 92-121 en_US
dc.identifier.issn 1166-3081
dc.identifier.issn 1958-5780
dc.description Copyright: 2018 Taylor & Francis. Due to copyright restrictions, the attached PDF file contains the postprint version of the published item. For access to the published version, kindly consult the publisher's website: en_US
dc.description.abstract We investigate an aspect of defeasibility that has somewhat been overlooked by the nonmonotonic reasoning community, namely that of defeasible modes of reasoning. These aim to formalise defeasibility of the traditional notion of necessity in modal logic, in particular of its different readings as action, knowledge and others in specific contexts, rather than defeasibility of conditional forms. Building on an extension of the preferential approach to modal logics, we introduce new modal operators with which to formalise the notion of defeasible necessity and distinct possibility, and that can be used to represent expected effects, refutable knowledge, and so on. We show how KLM-style conditionals can smoothly be integrated with our richer language. We also propose a tableau calculus which is sound and complete with respect to our modal preferential semantics, and of which the computational complexity remains in the same class as that of the underlying classical modal logic. en_US
dc.language.iso en en_US
dc.publisher Taylor & Francis en_US
dc.relation.ispartofseries Worklist;22098
dc.subject Knowledge representation and reasoning en_US
dc.subject Non-monotonic reasoning en_US
dc.subject Modal logic en_US
dc.subject Preferential semantics en_US
dc.subject Defeasible modalities en_US
dc.subject Tableaux en_US
dc.title From KLM-style conditionals to defeasible modalities, and back en_US
dc.type Article en_US

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