Impossible and Conflicting Obligations in Justification Logic

Different notions of the consistency of obligations collapse in standard deontic logic.In justification logics, which feature explicit reasons for obligations, the situation isdifferent. Their strength depends on a constant specification and on the availableset of operations for combining different reasons. We present different consistencyprinciples in justification logic and compare their logical strength. Further, we proposea novel semantics for which justification logics with the explicit version of axiom D,jd,are complete for arbitrary constant specifications. We then discuss the philosophicalimplications with regard to some deontic paradoxes