Economic/decision study, level III.

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Abstract. In a recent paper, Sven Danielsson argued that the 'original paradoxes' of deontic logic, in particular Ross's paradox and Prior's paradox of derived obligation, can be solved by restricting the modal inheritance rule. I argue that this does not solve the paradoxes.In a recent paper, Sven Danielsson [8] argued that that the 'original paradoxes' of deontic logic, in particular Ross's paradox and Prior's paradox of derived obligation, can be solved by restricting the modal inheritance rule.1 Since these paradoxes have troubled deontic logic for three generations, and called the whole enterprise of deontic logic into question, 2 a solution would be extremely welcome. However, I argue that Danielsson's proposal has not succeeded in solving the paradoxes.