The Modal Octagon and John Buridan's Modal Ontology

In Jean-Yves Béziau & Gianfranco Basti (eds.), The Square of Opposition: A Cornerstone of Thought. Basel, Switzerland: Birkhäuser. pp. 35-52 (2016)
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Abstract

In this paper we will argue that the ontology implicit in John Buridan’s modal octagon commits him to a form of contingentism. In particular, we will argue that Buridan is committed to denying the validity of the Barcan and converse Barcan formulae.

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Spencer Johnston
Cambridge University

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Boolean considerations on John Buridan's octagons of opposition.Lorenz Demey - 2018 - History and Philosophy of Logic 40 (2):116-134.

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