Defeasible Reasoning

Cognitive Science 11 (4):481-518 (1987)
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Abstract

There was a long tradition in philosophy according to which good reasoning had to be deductively valid. However, that tradition began to be questioned in the 1960’s, and is now thoroughly discredited. What caused its downfall was the recognition that many familiar kinds of reasoning are not deductively valid, but clearly confer justification on their conclusions. Here are some simple examples.

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John Pollock
University of Edinburgh

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References found in this work

Theory of knowledge.Roderick M. Chisholm - 1966 - Englewood Cliffs, N.J.,: Prentice-Hall.
Change in View: Principles of Reasoning.Gilbert Harman - 1986 - Cambridge, MA, USA: MIT Press.
Perceiving: A Philosophical Study.Roderick M. Chisholm - 1957 - Ithaca,: Cornell University Press.
Probability and the logic of rational belief.Henry Ely Kyburg - 1961 - Middletown, Conn.,: Wesleyan University Press.

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