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Paper IPM / M / 16308  


Abstract:  
Different notions of the consistency of obligations collapse in standard deontic logic.
In justication logics, which feature explicit reasons for obligations, the situation is
different. Their strength depends on a constant specication and on the available
set of operations for combining dierent reasons. We present different consistency
principles in justication logic and compare their logical strength. Further, we propose
a novel semantics for which justication logics with the explicit version of axiom D, jd,
are complete for arbitrary constant specications. We then discuss the philosophical
implications with regard to some deontic paradoxes.
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