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 these subjects:

  • Science and technology
  • Psychology


Show Summary Details


modus tollens

Quick Reference

Any argument taking the form: If p, then q; Not-q; Therefore not-p. For example, If it is Sunday, then the restaurant is closed; The restaurant is not closed; Therefore, it is not Sunday. Such an argument is logically valid. See also denying the consequent. Compare modus ponens. [Latin: mood that denies]

Reference entries

View all reference entries »