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A theory of hierarchical consequence and conditionals
Dov Gabbay 1, Karl Schlechta 1
(2008-08-22)

We introduce A-ranked preferential structures and combine them with an accessibility relation. This framework allows us to formalize contrary to duty obligations. Representation results are proved.
1:  Laboratoire d'informatique Fondamentale de Marseille (LIF)
CNRS : UMR6166 – Université de la Méditerranée - Aix-Marseille II – Université de Provence - Aix-Marseille I
Mathematics/Logic
Preferential structures – nonmonotonic logics – contrary to duty obligations
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