Journal of Philosophical Logic 47 (6):947-964 (2018)

Authors
Dustin Tucker
Colorado State University
Abstract
Jörg Hansen, John Horty, and Xavier Parent and Leendert van der Torre have all recently described some sort of nonmonotonic logic to model reasons and their interactions. Horty’s framework is broader in scope than the other two, encompassing both reasoning about the relative strengths of reasons and reasoning about which reasons to consider in the first place. Hansen discusses a plethora of approaches and examples, including Horty’s, arguing that his preferred system best captures our intuitions. And Parent and van der Torre present a family of systems of input/output logic, which are in some ways the most flexible. In this paper, I aim to combine these features. Without attempting to answer the question of which intuitions are the best to capture, I first argue that there are good reasons to explore systems that behave more like Hansen’s than Horty’s. I then show that Parent and van der Torre’s framework of input/output logic can exactly duplicate Hansen’s system but is flexible enough to produce other results as well. Finally, I extend their framework to include the additional kinds of reasoning Horty discusses, showing that the resulting theory can handle a wider range of cases than Horty’s.
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DOI 10.1007/s10992-018-9456-3
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References found in this work BETA

Reasons as Defaults.John Horty - 2007 - Philosophers' Imprint 7:1-28.
Moral Particularism in the Light of Deontic Logic.Xavier Parent - 2011 - Artificial Intelligence and Law 19 (2-3):75-98.

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