Akman, V.2019-02-132019-02-132017http://hdl.handle.net/11693/49368The standard propositional exposition of necessary and su cient conditions, as available in introductory logic texts, leads to a contradiction. It should be abolished.EnglishNecessary conditionSufficient conditionNeither-norArticle10.26686/ajl.v14i3.40221448-5052