Chapter

Validity

Graham Priest

in Doubt Truth to be a Liar

Published in print December 2005 | ISBN: 9780199263288
Published online May 2006 | e-ISBN: 9780191603631 | DOI: http://dx.doi.org/10.1093/0199263280.003.0012
 Validity

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This chapter provides a general account of the nature of validity, both deductive and non-deductive, which may be accepted depending on what one takes the correct logic to be. It argues against a proof-theoretic characterization of validity in terms of a model-theoretic one.

Keywords: validity; proof theory; model theory; Tarski; Etchemendy; non-monotonic logic

Chapter.  9501 words. 

Subjects: Philosophy of Mathematics and Logic

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