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Spencer Johnston [12]Spencer C. Johnston [2]
  1.  78
    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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  2.  52
    Per Se Modality and Natural Implication – an Account of Connexive Logic in Robert Kilwardby.Spencer Johnston - 2019 - Logic and Logical Philosophy 28 (3):449.
  3.  64
    Connexive Principles After a ‘Classical’ Turn in Medieval Logic.Spencer C. Johnston - 2021 - History and Philosophy of Logic 43 (3):251-263.
    The aim of this paper is to look at the arguments advanced by three Parisian arts masters about how to understand Prior Analytics II 4 and the more general discussion that medieval authors situate...
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  4.  70
    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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  5.  22
    (2 other versions)A Simple Semantics for Aristotelian Apodeictic Syllogistics.Sara L. Uckelman & Spencer Johnston - 1998 - In Marcus Kracht, Maarten de Rijke, Heinrich Wansing & Michael Zakharyaschev (eds.), Advances in Modal Logic. CSLI Publications. pp. 454-469.
  6.  46
    The Modal Octagon and John Buridan's Modal Ontology.Spencer Johnston - 2016 - In Jean-Yves Béziau & Gianfranco Basti (eds.), The Square of Opposition: A Cornerstone of Thought. Basel, Switzerland: Birkhäuser. 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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  7.  16
    Essentialism, nominalism, and modality: the modal theories of Robert Kilwardby & John Buridan.Spencer C. Johnston - unknown
    In the last 30 years there has been growing interest in and a greater appreciation of the unique contributions that medieval authors have made to the history of logic. In this thesis, we compare and contrast the modal logics of Robert Kilwardby and John Buridan and explore how their two conceptions of modality relate to and differ from modern notions of modal logic. We develop formal reconstructions of both authors' logics, making use of a number of different formal techniques. In (...)
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  8.  21
    The Knowledge of Contradictions.Daniel Molto & Spencer Johnston - 2022 - Thought: A Journal of Philosophy 11 (3):157-164.
    If there are true contradictions, where are they? In language or in the world? According to one important view, best represented by Jc Beall (2009), only the former. In this paper, we raise a problem for this view. In order to defend a “merely semantic” version of dialetheism (aka ‘glut theory’), Beall adopts transparent accounts of truth and falsity, which gives rise to “dialethic ascent” on which true contradictions are also, contradictorily, untrue contradictions. This is a consequence of trying to (...)
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  9.  9
    Interpreting Buridan: critical essays.Spencer Johnston & Henrik Lagerlund (eds.) - 2024 - Cambridge: Cambridge University Press.
    A collection of new essays on the influential medieval philosopher John Buridan, written by leading Buridan scholars. The volume places Buridan in his philosophical context and examines his writings on topics including logic, modal logic, paradoxes, metaphysics, epistemology, theory of knowledge, moral philosophy, and natural philosophy.
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  10. Mystery at the Spandrels.Daniel Molto & Spencer Johnston - 2023 - In Jonathan Rutledge (ed.), Paradox and Contradiction in Theology. New York, NY: Routledge Academic. pp. 173-190.
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  11.  32
    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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  12.  17
    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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