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We study the process of observation (measurement), within the framework of a “perspectival” (“relational,” “relative state”) version of the modal interpretation of quantum mechanics. We show that if we assume certain features of discreteness and determinism in the operation of the measuring device (which could be a part of the observer's nerve system), this gives rise to classical characteristics of the observed properties, in the first place to spatial localization. We investigate to what extent semi-classical behavior of the object system (...) itself (as opposed to the observational system) is needed for the emergence of classicality. Decoherence is an essential element in the mechanism of observation that we assume, but it turns out that in our approach no environment-induced decoherence on the level of the object system is required for the emergence of classical properties. (shrink)

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This paper argues for two principal conclusions about natural language semantics based on John Buridan's considerations concerning the notion of formal consequence, that is, formally valid inference. (1) Natural languages are essentially semantically closed, yet they do not have to be on that account inconsistent. (2) Natural language semantics has to be token based, as a matter of principle. The paper investigates the Buridanian considerations leading to these conclusions, and considers some obviously emerging objections to the Buridanian approach.

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Ramsey et al.'s article provides a more sensitive framework for comparative innovation than others' operationalisations have done. Nevertheless, a methodology has to be elaborated in order to determine to what degree a behaviour is novel. Psychological processes have to be considered when evaluating the value of reference groups and in order to figure out where to look for innovation.

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"This question, and others, asking about the number of predicates, or of the predicables, or of the categories, or of natural principles, or the elements, etc. are rather difficult and tedious, especially for youngsters, for whom one should explain the logical and sophistic cavils which the more advanced students [need] no longer care about. Therefore, for the sake of freshmen, I posit some easy and [somewhat] facetious conclusions". (p. 183, ll. 2203-2209.).

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Anthony Kenny's book is one of the best of its genre, exemplifying the kind of introduction into (some field of) Aquinas's thought that endeavors to make his ideas accessible to the philosophically interested contemporary reader in terms of such philosophical, scientific and everyday concepts with which the reader can safely be assumed to be familiar. Indeed, Kenny's book provides us with such a good example of this genre that it brings into sharp focus the problems of the genre itself. Therefore, (...) while duly acknowledging the book's virtues of clarity of presentation, and its highly readable, almost conversational style, let me concentrate in this brief review on this problematic aspect of Kenny's book, as someone who is just as much concerned with making Aquinas accessible to a contemporary audience as the author is. (shrink)

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"What can a scholastic do in the 20 th century?" - asks Katalin Vidrányi in the title of her article written in 1970. [1] If her characteristically systematic and pithy analysis can be summarized in a single sentence, the author's answer is this: many things, but not too much.

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This paper primarily aims to provide a coherent interpretation of several, apparently conflicting claims made by Aquinas concerning the semantic function of the copula. The paper also argues that these claims can properly be understood only if they are interpreted as forming a coherent part of Aquinas' larger theory of the analogy of being. The Appendix sketches a model theoretical semantics for the reconstruction of Aquinas' relevant ideas, providing the technical means for setting apart the various senses of the verb (...) 'est' and its cognates distinguished by Aquinas. (shrink)

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After a brief analysis of the specifics of teleological explanations as opposed to causal explanations, the paper seeks to establish the irreducibility of the former to the latter by arguing that teleological explanations are inextricably tied to our notion of intentionality. Since this result undermines the very possibility of “a physicalist reduction” of the explanation of teleological phenomena, especially of human beha- vior, the rest of the paper develops an argument against the perceived need of any such reduction. According to (...) the conclusion of the paper, a more promising program is the development of a “modern, scientific Aristotelianism”, one that can provide a consistent conceptual framework that accommodates both types of explanation. (shrink)

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This paper contrasts the Thomistic and Cartesian interpretations of what the substantial unity of the body and mind can consist in. A detailed discussion of the Thomistic account of the substantial unity of body and soul identifies especially those principles of the presupposed hylomorphist metaphysical background of this account that Descartes abandoned. After arguing for the consistency of the Thomistic view, briefly outlines how certain developments in late-medieval scholasticism prepared the way for the abandonment of precisely these principles. Finally, the (...) paper shows why from the perspective of the Thomistic principles identified in the first part, Descartes has to appear as someone paying mere lip-service to the thesis of the substantial unity of body and mind. (shrink)

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This paper is not going to offer any criticism of the way Gaven Kerr treats Aquinas’ argument. Instead, it offers an alternative way of reconstructing Aquinas’ argument, intending to strengthen especially those controversial aspects of it that Kerr’s reconstruction left untreated or in relative obscurity. Accordingly, although the paper’s treatment will have to have some overlaps with Kerr’s, it will deal with issues essential to adequate replies to certain competent criticisms of his argument untreated by Kerr. For the sake of (...) the “formally inclined” reader, the paper’s treatment will also include an Appendix offering a formal reconstruction of both the main argument and its sub-arguments to demonstrate the formal rigor of Aquinas’ original. (shrink)

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This paper examines the multiple semantic functions Aquinas attributes to the verb ‘est’, ranging from signifying the essence of God to acting as a copula of categorical propositions to expressing identity. A case will be made that all these apparently radically diverse functions are unified under Aquinas’s conception of the analogy of being, treating all predications as predications of being with or without some qualification (secundum quid or simpliciter). This understanding of the multiplicity of the semantic functions of this verb (...) as conceived by Aquinas will enable us to have a better understanding of the meaning of his metaphysical claims and arguments. In particular, with this understanding of Aquinas’ conception of being, we will be able to see how Aquinas’s famous “intellectus essentiae” argument for the thesis of the real distinction between essence and existence in creatures can work, despite Anthony Kenny’s arguments to the contrary in his recent book Aquinas on Being. (shrink)

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This volume is about the most mind-boggling sacrament of the Christian faith, also referred to as the Sacrament of the Altar, the Eucharist: in its Roman Catholic interpretation, the conversion of the substance of the bread and wine into the body and blood of Christ for Holy Communion. The challenge of providing a rational interpretation of this doctrine of faith proved to be one of the most contentious issues in the Western history of ideas, apparently going against self-evident metaphysical principles (...) (requiring accidents existing without a substance, and a body in several places at the same time, etc.), and dividing schools of thought, indeed, eventually, warring religious factions. The volume addresses both the metaphysical, theoretical issues involved in this challenge and the historical, theological developments of how meeting this challenge played out first in the schools and even later in religious schisms, leading to the paradigmatic shift from medieval to modern forms of thought. The essays of the volume derive from the lectures of an eponymous international conference held in Budapest, Hungary, which was also the occasion of founding the Society for the History of European Ideas (SEHI); accordingly, the book is the first volume of the annual Proceedings of the SEHI. This book is aimed just as much at laymen and religious scholars seeking a better understanding of their faith as at anyone seeking this understanding with a non-religious attitude. (shrink)

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The lectures presented here are the by-product of my teaching in Yale's Directed Studies program from 1991 through 1993 (hence the title, for want of a better). In fact, being what they are, lecture notes for an introductory philosophy course, they present rather elementary material. Yet, I flatter myself, they do not lack certain originality in the treatment of some of the basic questions of traditional metaphysics and epistemology. In any case, over the past couple of years they proved to (...) be quite useful in teaching my several other courses, especially in medieval philosophy. Thus, being too elementary for transforming them into scholarly papers, on the one hand, yet, containing what I think to be both philosophically interesting and pedagogically useful ideas, on the other, I decided to publish them here, in the Net's formally less stringent medium. Here they can easily be accessed by people who think what they need is a clear and simple discussion of the intriguing philosophical points themselves, rather than the meticulous and sometimes cumbersome scholarly discussions of the texts that raised them (a description which fits, at least, the majority of my students). Given these considerations (as well as the author's lack of time), the lectures are presented here basically unedited, in the form as they were actually delivered, without any notes or references (disregarding the occasionally inserted page numbers, serving as reminders for myself, referring to the texts we used in class). However, anyone who is interested in the more detailed scholarly discussion of some of the topics touched upon here may wish to check some of the papers listed on my.. (shrink)

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This paper presents John Buridan’s nominalist ontology of habits, as the acquired qualities of innate powers aiding or hampering their operations, against the background of a more traditional interpretation of Aristotle’s doctrine to be found in Boethius, Albert the Great, Thomas Aquinas, and Cajetan. The paper argues that considerations of his late question commentary on Aristotle’s Nicomachean Ethics may have forced Buridan to rethink some of his earlier arguments for his parsimonious nominalist ontology of powers endorsed in such earlier works (...) as his Questions on Aristotle’s Categories and De anima. The lesson to be drawn from this investigation seems to be that upon working out the details of a nominalist programme in such fields as moral psychology and ethics, the requisite refinements sooner or later will involve such modifications of an originally “radical” programme that would bring it closer to what used to be the “mainstream” view. Even so, this much seems enough further down the line to change significantly how issues are framed relative to the “mainstream” view as well. (shrink)

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The final chapter provides a summary account of Buridan’s essentialist nominalism, showing how Buridan can successfully claim to be both a nominalist denying the existence of real shared essences and an essentialist endorsing the possibility of discovering truly essential attributes of things, which allows valid scientific generalizations. The concluding critical part of the chapter, however, points out a fundamental conflict between Buridan’s abstractionist cognitive psychology of absolute concepts and his logical semantics of the corresponding absolute terms that grounds his nominalist (...) essentialism. (shrink)

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This chapter contains sections titled: The author of the Summulae The Summulae and the realism of Peter of Spain.

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In these comments I am going to argue that Yiwei Zheng's paper, by postulating an imaginary mental language in a proposed new interpretation of Ockham's conception of mental language, provides us with an imaginary solution to what turns out to be an imaginary problem. Having said this, however, I hasten to add that the paper has undeniable merits in pointing us in the right direction for revealing the imaginary character of the problem.

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In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Philosophy 41.2 (2003) 272-273 [Access article in PDF] Matthew of Orléans. Sophistaria sive summa communium distinctionum circa sophismata accidentium. Edited by Joke Spruyt. Leiden: Brill, 2001. Pp. ix + 581. Cloth, $151.00. Matthew of Orléans is not a famous author (indeed, even his name is given tentatively by the editor on the basis of the explicit of one manuscript). And the Sophistaria was apparently (...) not one the most influential works of its time, the early thirteenth century (its full text is preserved only in a couple of manuscripts, and it has never been printed before). Yet, the Sophistaria of Matthew of Orléans is a fine example of a characteristic genre in the rich tradition of medieval logical literature. The genre itself is an interesting combination of two other characteristic genres: treatises on syncategoremata and sophismata. The sophismata treatises are discussions of problem-sentences (sophismata) usually grouped together to illustrate some logical doctrinal points, especially concerning the resolution of ambiguities caused by the logical behavior of syncategorematic terms in various contexts. The treatises on syncategoremata provide systematic discussions of the logical behavior of syncategorematic words, i.e., logical connectives, themselves. But these treatises also illustrate their doctrinal points by resolving the ambiguities of sophismata, mostly using some commonly accepted distinctions concerning how the function of the syncategoremata is to be construed in the contexts provided by these problem-sentences. The proper subject matter of the sophistaria treatises is the discussion of these common distinctions, dealing especially with ambiguities caused by (what we would describe as) the different possible scopes of the syncategoremata occurring in the paradigmatic sophismata.For example, take the sentence "Someone seeing nothing is someone seeing something." This sentence can be regarded as ambiguous, if we analyze "nothing" into "not... a thing," yielding (1) "Someone not seeing a thing is someone seeing something," which can be taken to be ambiguous between (a) "Someone not seeing anything is someone seeing something" and (b) "Someone not seeing something is someone seeing something," depending on whether we take "not" in (1) to be operating (a) on "seeing a thing," or (b) only on "seeing." On this analysis, the ambiguous sentence is obviously false in the first sense, but may be true in the second, for it may be true of Socrates who does not see Plato but sees Coriscus.To be sure, this is not the only possible way to account for the (genuine or putative) ambiguity of the original sentence. In fact, this is not the account considered by Matthew of Orléans or in a parallel passage by Peter of Spain in their analyses of the corresponding Latin sentence (Nihil videns est aliquid videns), although one of the arguments for the truth of the sophisma they reject would be a good argument for the second reading provided here (cf. Peter of Spain, Tractatus [Van Gorcum: Assen, 1972], 220, ll. 10-6, and Sophistaria, 88, ll. 16-20). In any case, the point of the sophistaria treatises is precisely the discussion of the merits and demerits of such possible accounts.The Sophistaria of Matthew of Orléans is a well-organized, highly structured treatise, divided into eight chapters, corresponding to the eight groups of syncategorematic terms [End Page 272] it deals with. The first chapter is devoted to the discussion of common distinctions concerning negations (both propositional and term-negations, including privative negation), the second deals with exclusive words (such as "only"), the third with exceptive words ("besides," "except," "unless"), the fourth with the conditional sign "if," the fifth with the modalities "necessarily" and "contingently," the sixth with the verbs "begins" and "ceases," the seventh with the word "whether," and the eighth with the distributive sign "every," that is, the universal sign that causes the terms it is construed with to be distributed for everything that falls under it.The discussion of these topics in the individual chapters is organized around typical scholastic questions raised concerning the validity of some common distinction in connection with typical sophismata, involving ambiguities in the operation... (shrink)

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Is there a grammar of the name ‘God’? In an obvious and trivial sense there certainly is. This term, being a part of the English language, has to obey the grammatical rules of that language. So, for example, by consulting the relevant textbooks and dictionaries we can establish that ‘God’ is a noun, so it can function as the subject or predicate of simple categorical sentences, but it cannot, for example, function as a verb or a preposition.

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Having seen the limitations of a reconstruction of Buridan’s semantics in terms of a modified quantification theory, this chapter begins engaging Buridan’s theory in its own terms, starting with a detailed discussion of the semantic properties of terms. The discussion moves from a brief discussion of Buridan’s distinction between immediate and ultimate signification, to Buridan’s theory of reference, namely, supposition, and oblique reference, namely, appellation. The chapter discusses suppositional descents as distinguishing quantifier-scopes, numerical quantification, and appellation in temporal and modal (...) contexts, as well as Buridan’s peculiar theory of appellatio rationis, the theory of oblique reference to concepts in intentional contexts. (shrink)

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This chapter provides a systematic discussion of Buridan’s nominalist semantics of propositions and sentential nominalizations. The chapter argues that despite its incompleteness, Buridan’s theory is still “nominalism’s best shot” at a semantics of propositions without buying into a philosophically and theologically dubious ontology of dicta, enuntiabilia, complexe significabilia, real propositions, or states of affairs.

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Buridan's life, works, and influence -- Buridan's logic and the medieval logical tradition -- The primacy of mental language -- The various kinds of concepts and the idea of a mental language -- Natural language and the idea of a formal syntax in Buridan -- Existential import and the square of opposition -- Ontological commitment -- The properties of terms (proprietates terminorum) -- The semantics of propositions -- Logical validity in a token-based, semantically closed logic -- The possibility of scientific (...) knowledge -- Buridan's anti-skepticism -- Buridan's essentialist nominalism. (shrink)

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This chapter focuses on how Aquinas’ solution of the problem of the persistence of eucharistic species and other scholastics’ reactions to it opened up certain conceptual possibilities in the Scholastic Aristotelian tradition that would not have been there without it, and which, therefore, were pointing the way toward later conceptual developments in the post-medieval and early modern philosophical traditions in logic, and metaphysics.

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This paper confronts a certain modern view of the relation between semantics and ontology with that of the late-medieval nominalist philosophers, William Ockham and John Buridan. The modern view in question is characterized in terms of what is called here “the thesis of onto-semantic parallelism,” which states that the primitive (indefinable) categorematic concepts of our semantics mark out the primary entities in reality. The paper argues that, despite some apparently plausible misinterpretations to the contrary, the late-medieval nominalist program of “ontological (...) reduction” was not driven by considerations that try to “read off” ontology from semantic analysis or those that try to identify semantic primitives in their search for ontological primitives. The medieval authors presented a much more flexible, dynamic view of “Aristotelian naturalism,” which challenges both of the unappealing modern alternatives of “conceptual tribalism” and “conceptual imperialism.”. (shrink)

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This chapter provides a brief survey of Buridan’s reliabilist epistemology, contrasting it with skeptical challenges of his time, and comparing it with modern responses to similar skeptical challenges in modern philosophy, arguably stemming from the controversies of Buridan’s time. In particular, the chapter argues that the sort of “Demon-skepticism” modern readers are familiar with from Descartes was made conceptually possible precisely by the emergence of late-medieval nominalist semantics, and that the modern strategies responding to the skeptical challenge, exemplified by the (...) works of Thomas Reid and most recently John Greco, originate in the epistemic principles of Buridan. (shrink)

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To many contemporary philosophers, the phrase “essentialist nominalism” may appear to be an oxymoron. After all, essentialism is the doctrine that things come in natural kinds characterized by their essential properties, on account of some common nature or essence they share. But nominalism is precisely the denial of the existence, indeed, the very possibility of such shared essences. Nevertheless, despite the intuitions of such contemporary philosophers,2 John Buridan was not only a thoroughgoing nominalist, as is well-known, but also a staunch (...) defender of a strong essentialist doctrine against certain skeptics of his time. But then the question inevitably arises: could he consistently maintain such a doctrine? (shrink)

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Contemporary "essentialism", if we want to provide a succinct, yet sufficiently rigorous characterization, may be summarized in the thesis that some common terms are rigid designators. [1] By the quotation marks I intend to indicate that I regard this as a somewhat improper (though, of course, permitted) usage of the term (after all, nomina significant ad placitum [2]). In contrast to this, essentialism, properly so-called, is the Aristotelian doctrine summarizable in the thesis--as we shall see, no less rigorous in its (...) own theoretical context--that things have essences. (shrink)

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