Abstract
In this paper we describe an algorithmic framework for a multi-modal logic arising from the combination of the system of modal (epistemic) logic devised by Meyer and van der Hoek for dealing with nonmonotonic reasoning with a deontic logic of the Jones and Pörn-type. The idea behind this (somewhat eclectic) formal set-up is to have a modal framework expressive enough to model certain kinds of deontic defeasibility, in particular by taking into account preferences on norms. The appropriate inference mechanism is provided by a tableau-like modal theorem proving system which supports a proof method closely related to the semantics of modal operators. We argue that this system is particularly well-suited for mechanizing nonmonotonic forms of inference in a monotonic multimodal setting.
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© 1996 British Computer Society
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Artosi, A., Governatori, G., Sartor, G. (1996). Towards a Computational Treatment of Deontic Defeasibility. In: Brown, M.A., Carmo, J. (eds) Deontic Logic, Agency and Normative Systems. Workshops in Computing. Springer, London. https://doi.org/10.1007/978-1-4471-1488-8_2
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DOI: https://doi.org/10.1007/978-1-4471-1488-8_2
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