The Oxford Biblical Studies Online and Oxford Islamic Studies Online have retired. Content you previously purchased on Oxford Biblical Studies Online or Oxford Islamic Studies Online has now moved to Oxford Reference, Oxford Handbooks Online, Oxford Scholarship Online, or What Everyone Needs to Know®. For information on how to continue to view articles visit the subscriber services page.

Related Content

More Like This

Show all results sharing this subject:

  • Philosophy


Show Summary Details


deontic logic

Quick Reference

A logical calculus created by adding operators ‘Op’ (it ought to be the case that p) and ‘Pp’ (it is permissible that p) to a basic system such as the propositional calculus, together with rules of inference for them. A deontic logic will study inferences between these forms, telling for instance whether Op & pq yield Oq, or whether Op → ¬O¬p. Principles such as these have proved controversial and there is no one ‘classical’ system of deontic logic. See also gentle murder, paradox of.

Subjects: Philosophy

Reference entries