History and Philosophy of Logic 36 (1):18-28 (2015)

Authors
Yann Benétreau-Dupin
San Francisco State University
Abstract
Jean Buridan has offered a solution to the Liar Paradox, i.e. to the problem of assigning a truth-value to the sentence ‘What I am saying is false’. It has been argued that either this solution is ad hoc since it would only apply to self-referencing sentences [Read, S. 2002. ‘The Liar Paradox from John Buridan back to Thomas Bradwardine’, Vivarium, 40 , 189–218] or else it weakens his theory of truth, making his ‘a logic without truth’ [Klima, G. 2008. ‘Logic without truth: Buridan on the Liar’, in S. Rahman, T. Tulenheimo and E. Genot, Unity, Truth and the Liar: The Modern Relevance of Medieval Solutions to the Liar Paradox, Berlin: Springer, 87–112 ; Dutilh Novaes, C. 2011. ‘Lessons on truth from mediaeval solutions to the Liar Paradox’, The Philosophical Quarterly, 61 , 58–78]. Against , I will argue that Buridan's solution by means of truth by supposition does not involve new principles. Self-referential sentences force us to handle supposition more carefully, which does not warrant the accusation of adhoccery. I will also argue, against (2), that it is exaggerated to assert that this solution leads to a ‘weakened’ theory of truth, since it is consistent with other passages of the Sophismata, which only gives necessary conditions for the truth of affirmative propositions, but sufficient conditions for falsity.
Keywords Buridan  Liar Paradox  Supposition theory
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Reprint years 2015
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DOI 10.1080/01445340.2014.922363
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References found in this work BETA

Symmetry and Paradox.Stephen Read - 2006 - History and Philosophy of Logic 27 (4):307-318.
Insolubles.Paul Vincent Spade - 2008 - Stanford Encyclopedia of Philosophy.

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Citations of this work BETA

Abharī’s Solution to the Liar Paradox: A Logical Analysis.Mohammad Saleh Zarepour - forthcoming - Tandf: History and Philosophy of Logic:1-16.

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