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John Buridan$
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Gyula Klima

Print publication date: 2008

Print ISBN-13: 9780195176223

Published to Oxford Scholarship Online: January 2009

DOI: 10.1093/acprof:oso/9780195176223.001.0001

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Existential Import and the Square of Opposition

Existential Import and the Square of Opposition

John Buridan

Gyula Klima (Contributor Webpage)

Oxford University Press

The sixth chapter discusses the issue of how the reconstruction of the relevant parts of Buridan’s logic and medieval logic in general, using restricted variables, validates the attribution of existential import to affirmative propositions, in turn establishing the validity of all relations of the traditional Square of Opposition (and consequently of traditionally valid Aristotelian syllogistic forms). The chapter also discusses how Buridan’s theory of natural supposition handles some objections to this conception concerning law-like statements, and, in general, how his theory of ampliation handles the issue of existential import in intensional (modal, temporal and intentional) contexts.

Keywords:   existential import, Square of Opposition, syllogistic, natural supposition, ampliation, intensional contexts, modal contexts, temporal contexts, intentional contexts

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