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Spencer Johnston [9]Spencer C. Johnston [1]
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Spencer Johnston
Cambridge University
Spencer Johnston
University of Toronto
  1.  14
    Per Se Modality and Natural Implication – an Account of Connexive Logic in Robert Kilwardby.Spencer Johnston - 2019 - Logic and Logical Philosophy 28 (3):449.
  2.  44
    Ockham and Buridan on the Ampliation of Modal Propositions.Spencer Johnston - 2015 - British Journal for the History of Philosophy 23 (2):234-255.
    This paper explores a currently unnoticed argument used by John Buridan to defend his analysis of modal propositions and to reject the analysis of modal propositions of necessity put forward by William of Ockham. First, I explore this argument and, by considering possible responses of Ockham to Buridan, show some of the ways in which Ockham seems to be keeping closer to Aristotle's remarks about modal propositions in Prior Analytics, 18.
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  3.  42
    A Formal Reconstruction of Buridan's Modal Syllogism.Spencer Johnston - 2015 - History and Philosophy of Logic 36 (1):2-17.
    In this paper, we provide a historical exposition of John Buridan's theory of divided modal propositions. We then develop a semantic interpretation of Buridan's theory which pays particular attention to Buridan's ampliation of modal terms. We show that these semantics correctly capture his syllogistic reasoning.
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  4.  25
    The Modal Octagon and John Buridan's Modal Ontology.Spencer Johnston - 2017 - In J. Béziau & G. Basti (eds.), The Square of Opposition: A Cornerstone of Thought. Springer. pp. 35-52.
    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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  5.  17
    A Simple Semantics for Aristotelian Apodeictic Syllogistics.Sara L. Uckelman & Spencer Johnston - 2010 - Advances in Modal Logic 8:454-469.
    We give a simple definition of validity for syllogisms involving necessary and assertoric premises which validates all and only the Aristotelian apodeictic syllogisms.
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  6.  10
    A Simple Semantics for Aristotelian Apodeictic Syllogistics.Sara L. Uckelman & Spencer Johnston - 2010 - In Lev Beklemishev, Valentin Goranko & Valentin Shehtman (eds.), Advances in Modal Logic, Volume 8. CSLI Publications. pp. 454-469.
  7.  11
    John Buridan's Sophismata and Interval Temporal Semantics.Sara L. Uckelman & Spencer Johnston - 2010 - History of Philosophy & Logical Analysis 13:133-147.
    In this paper we look at the suitability of modern interval-based temporal logic for modeling John Buridan’s treatment of tensed sentences in his Sophismata. Building on the paper [Øhrstrøm 1984], we develop Buridan’s analysis of temporal logic, paying particular attention to his notions of negation and the absolute/relative nature of the future and the past. We introduce a number of standard modern propositional interval temporal logics to illustrate where Buridan’s interval-based temporal analysis differs from the standard modern approaches. We give (...)
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  8.  2
    A Simple Semantics for Aristotelian Apodeictic Syllogistics.Sara L. Uckelman & Spencer Johnston - 2010 - In Marcus Kracht, Maarten de Rijke, Heinrich Wansing & Michael Zakharyaschev (eds.), Advances in Modal Logic. CSLI Publications. pp. 454-469.
  9.  3
    John Buridan’s Sophismata and Interval Temporal Semantics.Sara L. Uckelman & Spencer Johnston - 2010 - History of Philosophy & Logical Analysis 13 (1):131-147.
    In this paper we look at the suitability of modern interval-based temporal logic for modeling John Buridan’s treatment of tensed sentences in his Sophismata. Building on the paper, we develop Buridan’s analysis of temporal logic, paying particular attention to his notions of negation and the absolute/relative nature of the future and the past.We introduce a number of standard modern propositional interval temporal logics to illustrate where Buridan’s interval-based temporal analysis differs from the standard modern approaches. We give formal proofs of (...)
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