Consistency and permission in deontic justification logic

Faroldi, Federico L G; Ghari, Meghdad; Lehmann, Eveline; Studer, Thomas (2022). Consistency and permission in deontic justification logic. Journal of logic and computation, 34(4), pp. 640-664. Oxford University Press 10.1093/logcom/exac045

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Different notions of the consistency of obligations collapse in standard deontic logic. In justification logics, which feature explicit reasons for obligations, the situation is different. Their strength depends on a constant specification and on the available set of operations for combining different reasons. We present different consistency principles in justification logic and compare their logical strength. We propose a novel semantics for which justification logics with the explicit version of axiom D, jd⁠, are complete for arbitrary constant specifications. Consistency is sometimes formulated in terms of permission. We therefore study permission in the context of justification logic, introducing a notion of free-choice permission for the first time. We then discuss the philosophical implications with regard to some deontic paradoxes.

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