Authors
Fabrizio Macagno
Universidade Nova de Lisboa
Douglas Walton
Last affiliation: University of Windsor
Abstract
We argue that common knowledge, of the kind used in reasoning in law and computing is best analyzed using a dialogue model of argumentation (Walton & Krabbe 1995). In this model, implicit premises resting on common knowledge are analyzed as endoxa or widely accepted opinions and generalizations (Tardini 2005). We argue that, in this sense, common knowledge is not really knowledge of the kind represent by belief and/or knowledge of the epistemic kind studied in current epistemology. This paper takes a different approach, defining it in relation to a common commitment store of two participants in a rule-governed dialogue in which two parties engage in rational argumentation (Jackson & Jacobs 1980; van Eemeren & Grootendorst 2004). A theme of the paper is how arguments containing common knowledge premises can be studied with the help of argumentation schemes for arguments from generally accepted opinion and expert opinion. It is argued that common knowledge is a species of provi- sional acceptance of a premise that is not in dispute at a given point in a dia- logue, but may later be defeated as the discussion proceeds
Keywords enthymemes  legal argumentation  metadialogues  generally accepted opinions  evidence  generalizations  defeasible reasoning
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References found in this work BETA

Mathematical Models of Dialogue.C. L. Hamblin - 1971 - Theoria 37 (2):130-155.
Aristotle and the Methods of Ethics.Jonathan Barnes - 1980 - Revue Internationale de Philosophie 34 (3):490.
Enthymematic Arguments.David Hitchcock - 1985 - Informal Logic 7 (2).

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Citations of this work BETA

Presupposition as Argumentative Reasoning.Fabrizio Macagno - 2015 - In Alessandro Capone & Jacob Mey (eds.), Interdisciplinary Studies in Pragmatics, Culture and Society. Cham, Switzerland: pp. 465-487.

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Argumentation Schemes.Douglas Walton, Chris Reed & Fabrizio Macagno - 2008 - Cambridge and New York: Cambridge University Press.

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