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Two Approaches to the Formalisation of Defeasible Deontic Reasoning

Henry Prakken
Studia Logica: An International Journal for Symbolic Logic
Vol. 57, No. 1, Papers in Deontic Logic (Jul., 1996), pp. 73-90
Published by: Springer
Stable URL: http://www.jstor.org/stable/20015864
Page Count: 18
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Two Approaches to the Formalisation of Defeasible Deontic Reasoning
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Abstract

This paper compares two ways of formalising defeasible deontic reasoning, both based on the view that the issues of conflicting obligations and moral dilemmas should be dealt with from the perspective of nonmonotonic reasoning. The first way is developing a special nonmonotonic logic for deontic statements. This method turns out to have some limitations, for which reason another approach is recommended, viz. combining an already existing nonmonotonic logic with a deontic logic. As an example of this method the language of Reiter's default logic is extended to include modal expressions, after which the argumentation framework in default logic of [20, 22] is used to give a plausible logical analysis of moral dilemmas and prima facie obligations.

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