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<p>Carmo and Jones have presented a sequence of candidate axiom systems for conditional obligation between 1997 and 2022. For their most recent system we demonstrate a limited form of deontic explosion: given that a student does not get the highest possible grade on a test, any other passing grade is acceptable. In addition to that negative result, we give a positive one: revisiting the strongest version of Carmo and Jones’ 1997 system, we provide a surprising classification of all satisfying models in terms of a single forbidden possible world.</p>

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Classification and Deontic Explosion for Contrary-to-Duty Obligations

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Bjørn Kjos-Hanssen

摘要

Carmo and Jones have presented a sequence of candidate axiom systems for conditional obligation between 1997 and 2022. For their most recent system we demonstrate a limited form of deontic explosion: given that a student does not get the highest possible grade on a test, any other passing grade is acceptable. In addition to that negative result, we give a positive one: revisiting the strongest version of Carmo and Jones’ 1997 system, we provide a surprising classification of all satisfying models in terms of a single forbidden possible world.