{"type":"ScholarlyArticle","title":"Weak Conditional Logics of Normality","authors":[{"name":"James P. Delgrande","slug":"james-p-delgrande","given":"James P.","family":"Delgrande","affiliation":""}],"abstract":"A default conditional a ---+ f3 has most often been informally interpreted as a defeasible version of a classical conditional, usually the material conditional. That is, the intuition is that a default should behave (implicitly or explicitly) as its (say) material counterpart \"by default\" or unless explicitly overridden. In this paper, we develop an alternative interpretation, in which a default is regarded more like a rule, leading from premises to conclusion. To this end, a general semantic framework under a \"rule-based\" interpretation is developed, and a family of weak conditional logics is specified, along with associated proof theories. Nonmonotonic inference is defined very easily in these logics. One obtains a rich set of nonmonotonic inferences concerning the incorporation of irrelevant properties and of property inheritance. Moreover, this interpretation resolves problems that have been associated with previous approaches.","doi":null,"url":"https://ijcai.org/proceedings/2003/125","pdf":"https://ijcai.org/proceedings/2003/0125.pdf","markdown":"https://ijcai.org/proceedings/2003/125.md","bibtex":"https://ijcai.org/proceedings/2003/bibtex/125","volume":{"slug":"2003","title":"Proceedings of the Eighteenth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 2003","url":"https://ijcai.org/proceedings/2003/","year":2003,"location":"Acapulco, Mexico","dates":"","editors":"Georg Gottlob","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":null,"track":"","number":125,"pages":{"first":873,"last":877},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}