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Saving Truth From Paradox$
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Hartry Field

Print publication date: 2008

Print ISBN-13: 9780199230747

Published to Oxford Scholarship Online: May 2008

DOI: 10.1093/acprof:oso/9780199230747.001.0001

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Intersubstitutivity and the Purpose of Truth

Intersubstitutivity and the Purpose of Truth

Chapter:
(p.205) 13 Intersubstitutivity and the Purpose of Truth
Source:
Saving Truth From Paradox
Author(s):

Hartry Field (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199230747.003.0014

This chapter investigates the importance of the intersubstitutivity of True(p) with p, which has to be abandoned in all classical-logic theories. It concedes that minor exceptions to intersubstitutivity (‘harmless gaps’) can be accommodated with little effect on truth serving its purposes, but argues that the failures of intersubstitutivity in gap and glut solutions to the paradoxes are far more serious. It also argues that while weakly classical theories do slightly better than gap and glut theories in this regard, it is only slightly.

Keywords:   Intersubstitutivity Principle, truth-value gaps, truth-value gluts, weakly classical theories

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