David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Philosophia 34 (3):355-376 (2006)
In this paper, the traditional view that argumentum ad ignorantiam is a logical fallacy is challenged, and lessons are drawn on how to model inferences drawn from knowledge in combination with ones drawn from lack of knowledge. Five defeasible rules for evaluating knowledge-based arguments that apply to inferences drawn under conditions of lack of knowledge are formulated. They are the veridicality rule, the consistency of knowledge rule, the closure of knowledge rule, the rule of refutation and the rule for argument from ignorance. The basic thesis of the paper is that knowledge-based arguments, including the argument from ignorance, need to be evaluated by criteria for epistemic closure and other evidential rules that are pragmatic in nature, that need to be formulated and applied differently at different stages of an investigation or discussion. The paper helps us to understand practical criteria that should be used to evaluate all arguments based on knowledge and/or ignorance.
|Keywords||knowledge-based reasoning argument from ignorance burden of proof fallacy consistency of knowledge epistemic closure closed world assumption|
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References found in this work BETA
Irving M. Copi (2008). Introduction to Logic. Pearson/Prentice Hall.
Douglas Walton & Erik C. W. Krabbe (1995). Commitment in Dialogue: Basic Concepts of Interpersonal Reasoning. State University of New York Press.
Jaakko Hintikka (1962). Knowledge and Belief. Ithaca, N.Y.,Cornell University Press.
R. Grootendorst, Frans Eemeren & Frans H. van Eemeren (1st ed. 2015). Fallacies in Pragma-Dialectical Perspective. In R. Grootendorst, Frans Eemeren & Frans H. van Eemeren (eds.), Reasonableness and Effectiveness in Argumentative Discourse. Springer International Publishing
Douglas Walton (1997). Appeal to Expert Opinion: Arguments From Authority. Penn State University Press.
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