Real Logic is Nonmonotonic

Authors:
Henry E. Kyburg, Jr.
Affiliations:
Department of Philosophy, University of Rochester and The Institute for Human and Machine Intelligence, USA
Venue:
Minds and Machines
Year:
2001

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Abstract

Charles Morgan has argued that nonmonotonic logic is ``impossible''. We show here that those arguments are mistaken, and that Morgan's preferred alternative, the representation of nonmonotonic reasoning by ``presuppositions'' fails to provide a framework in which nonmonotonic reasoning can be constructively criticised. We argue that an inductive logic, based on probabilistic acceptance, offers more than Morgan's approach through presuppositions.