•  27
  •  10
    An alternative to Brian Skyrms' approach to the Liar
    Notre Dame Journal of Formal Logic 17 (1): 137-146. 1976.
  • Obligationes
    Stanford Encyclopedia of Philosophy. forthcoming.
  •  36
    If Obligationes Were Counterfactuals
    Philosophical Topics 20 (2): 171-188. 1992.
  •  45
    From Guillelmi de Ockham, Summa logicae, Philotheus Boehner, Gedeon Gál and Stephanus Brown, ed., (“Guillelmi de Ockham Opera philosophica et theologica,” OPh I; St. Bonaventure, N.Y.: The Franciscan Institute, 1974), pp. 744–.
  •  33
    In the summer of 1980, I was privileged to be on the teaching staff of the Summer Institute on Medieval Philosophy held at Cornell University under the direction of Norman Kretzmann and the auspices of the Council for Philosophical Studies and the National Endowment for the Humanities. While I was giving a series of lectures on supposition theory, I went to my office one morning, and there under the door some anonymous wag from the Institute had slid the pen and ink drawing you see in the graphi…Read more
  •  92
    (1) (p. 31) (1.1) “Some things that are said are said with complexity, and others are said without complexity.”3 Those that are said without complexity are, for example, ‘man’, ‘animal’. Those that are said with complexity are, for example, ‘A man runs’, ‘An animal runs’.4 (2) It is plain from this that the incomplex is part of the complex.
  •  60
    Anselm and ambiguity
    International Journal for Philosophy of Religion 7 (3). 1976.
  •  36
  •  36
    The manuscript Venice, Biblioteca Nazionale Marciana, Class XI n. 12, Zanetti Latini 301 (= 1576), contains on fols. 1r–24v a seemingly unique copy of a series of fifteen logical questions, ten on obligationes and the remaining five on insolubilia.1 The series on obligationes is untitled and unattributed in the manuscript, but the questions on insolubilia begin (fol. 18r11) “Incipiunt quaestiones super insolubilibus,” and are attributed at the end to a certain John of Wesel (fol. 24v41): “Ergo e…Read more
  •  13
    Lies, language, and logic in the late Middle Ages (edited book)
    Variorum Reprints. 1988.
    'This sentence is false' - is that true? The 'Liar paradox' embodied in those words exerted a particular fascination on the logicians of the Western later Middle Ages, and, along with similar 'insoluble' problems, forms the subject of the first group of articles in this volume. In the following parts Professor Spade turns to medieval semantic theory, views on the relationship between language and thought, and to a study of one particular genre of disputation, that known as 'obligationes'. The fo…Read more
  •  26
    How to Start and Stop
    Journal of Philosophical Research 19 193-221. 1994.
    Mediaeval logicians often wrote about changes between contradictory states, for example a switch’s changing from being on to not being on. One of the questions discussed in these writings was whether at the moment the change occurs the changing thing is in the earlier or the later state. The present paper investigates the general setting for that question, and discusses the answer given by Walter Burley, an important early-fourteenth century author whose theory was a standard one. Burley’s theor…Read more
  • The Cambridge Companion to Ockham
    Tijdschrift Voor Filosofie 62 (3): 619-620. 2000.
  •  21
    Boethius's "de topicis differentiis"
    Journal of the History of Philosophy 18 (4): 470-471. 1980.
  • Roger Swyneshed's Obligationes. Edition and comments
    Archives d'Histoire Doctrinale et Littéraire du Moyen Âge 44. 1977.
  •  4
    William Heytesbury: On "Insoluble" Sentences
    Philosophical Review 90 (4): 605-607. 1981.
  •  56
    This is the first of three “tomes” of Jon Stewart’s habilitationisskrift in philosophy at the University of Copenhagen; the second concerns The Martensen Period: 1837–1842, and the third Kierkegaard and the Left-Hegelian Period: 1842–1860. Together they make up volume 3 of Stewart’s series Danish Golden Age Studies . Their purpose is “to put forth the basic information about the Danish Hegel reception in a clear and readable fashion” . Such information needs to be put forth because, unlike Hegel…Read more
  • Richard Brinkley's "De Insolubilibus": a Preliminary Assessment
    Rivista di Storia Della Filosofia 46 (2): 245. 1991.
  •  144
    The “dragon” that graces the cover of this volume has a story that goes with it. In the summer of 1980, I was on the teaching staff of the Summer Institute on Medieval Philosophy held at Cornell University under the direction of Norman Kretzmann and the auspices of the Council for Philosophical Studies and the National Endowment for the Humanities. While I was giving a series of lectures there (lectures that contribute to this volume, as it turns out), I went to my office one morning, and there …Read more
  •  42
    This is a supplement my original 2005 article "Insolubles" in the Stanford Encyclopedia of Philosophy.
  •  60
    1 There have been several editions of Fridugisus’ letter. I have consulted those in Jaques-Paul Migne, Patrologiae cursus completus … series latina, 221 vols., (Paris: J.-P. Migne, 1844–1864), vol. 105, cols. 751–756; Francesco Corvino, “Il ‘De nihilo et tenebris’ di Fredegiso di Tours,” Rivista critica di storia della filosofia (1956), pp. 273–286; and the most recent and authoritative edition, in Concettina Gennaro, Fridugiso di Tours e il “De substantia nihili et tenebrarum”: Edizione critica…Read more
  •  20
    (1) Assuming the significates of non-complex terms, in this treatise I intend to investigate certain properties of terms, [properties] that are applicable to them only insofar as they are parts of propositions. (2) Now I divide this tract into three parts. The first is about the supposition of terms, the second about appellation, and the third about copulation. Supposition belongs to the subject, appellation to the predicate. Copula-.
  • William of Ockham
    The Stanford Encyclopedia of Philosophy (Spring 2019 Edition). 2019.