Michael Vernon Wedin

Two main claims are defended. The first is that negative categorical statements are not to be accorded existential import insofar as they figure in the square of opposition. Against Kneale and others, it is argued that Aristotle formulates his o statements, for example, precisely to avoid existential commitment. This frees Aristotle's square from a recent charge of inconsistency. The second claim is that the logic proper provides much thinner evidence than has been supposed for what appears to be the received view, that is, for the view that insofar as they occur in syllogistic negative categoricals have existential import. At most there is a single piece of evidence in favor of the view?a special case of echthesis or the setting out of a case in proof

In "Metaphysics" Gamma 3 Aristotle declares that the philosopher investigates things that are qua things that are and that he therefore should be able to state the firmest principles of everything. The firmest principle of all is identified as the principle of non-contradiction (PNC). The main focus of Gamma 3 is Aristotle's proof for this identification. This paper begins with remarks about Aristotle's notion of the firmness of a principle and then offers an analysis of the firmness proof for PNC. It focuses on some key assumptions of the proof and on the range and force of the proof. Aristotle closes Gamma 3 with the claim that PNC is ultimate in the sense that all other principles somehow rest on it. This, rather controversial, claim is given a defensible reading and shown to be central to the chapter's effort to establish PNC as the firmest principle of all. As such it completes the firmness proof and is not simply an appended remark

In On Generation and Corruption, Aristotle rejects the very possibility of such a thing as Anaximander’s apeiron. Characterized as a kind of intermediate stuff, the apeiron turns out to consist of contraries and as such is impossible. Commentators have rightly noted this point and some have also indicated that Aristotle offers an argument of sorts for his negative estimate. However, the argument has received scant attention, and it is fair to say that it remains unclear exactly why Aristotle rejects Anaximander’s intermediate stuff. Indeed, it is unclear how Aristotle’s argument is supposed to run in the first place. This paper offers a reconstruction of Aristotle’s argument for the impossibility of the apeiron, and on this basis offers to explain Aristotle’s grounds for rejecting Anaximander’s intermediate stuff. This is especially called for in light of the fact that Aristotle himself thinks that there can be intermediate stuffs. Finally, some attention is given to the parallel between the apeiron and Aristotle’s prime matter

Anyone with more than casual interest in Aristotle's Categories knows the convention that "predicated of" ["κατηγορεἳται"] marks a general relation of predication while "said of" ["λέγεται"] is reserved for essential predication. By "convention" I simply mean to underscore that the view in question ranks as the conventional or received interpretation. Ackrill, for example, follows the received view in holding that only items within the same category (not arbitrarily, of course) can stand in the being-said-of relation and, thus, that only secondary substances can be said of primary substances. Despite its long received status the convention has never received a fully comprehensive examination and defense. In fact such an account is needed because, while enjoying considerable textual support, certain passages of the Categories appear to clash with the convention. My aim in this paper is, first, to develop and defend the standard interpretation, as I shall call it. Since the standard interpretation has lately been challenged in a closely argued article by Russell Dancy, my defense will proceed partly with an eye to his criticisms. Having met these, I go on to raise some difficulties with the rather unorthodox reading Dancy gives the Categories. The crucial point here turns out to be what Aristotle understands by a paronym.

Chapters 10 and 11 are critical to the argument of Metaphysics Zeta: these chapters are concerned with the purification of form. Z.10 introduces the apparatus of part and whole and consists of an argument to the end that form and its parts have priority over the other internal structural components of c‐substances, i.e. matter and the compound of form and matter; while in Z.11 Aristotle argues that form and its parts cannot involve any admixture of matter. Wedin argues that the causal role of form presupposes its purity: if form is to explain why a certain portion of matter constitutes a c‐substance of a given kind, then matter—whether this latter is understood as functional, or remnant matter—cannot already be contained in the form. This is the ‘purity thesis’, as Wedin calls it: matter cannot be included in the definitions of natural organisms, Wedin points out, because that would make the explanandum a part of the principle that explains it. Wedin also argues that form must be sufficiently complex to provide definitions of the natures of particular compounds, which are complex, even though form itself is a kind of universal.

In the Metaphysics, Aristotle often says that ‘form is substance’: in this chapter, Wedin argues that ‘substance’ in this context means the ‘substance‐of’ c‐substances. Wedin begins by examining Aristotle's use, and retention, of the framework of the Categories in Metaphysics Zeta, before turning to discuss Z.3, which is crucial to understanding the relation between the Categories and Metaphysics theories of substance, because it is usually thought that here Aristotle departs from the substance of the Categories. Wedin denies that Z.3 involves a rejection of the Categories subjecthood criterion for primary substance: Aristotle rejects only the claim that one thing is the substance of another simply if it is the primary underlying subject of the other. Wedin argues that in Z.3 Aristotle introduces the idea of the ‘substance‐of’ a thing, and identifies as candidates for the substance of c‐substances the internal structural components form, matter, and the compound of form and matter.

Wedin considers the problem of the compatibility of the Categories account of primary substance with the theory of substantial form of the Metaphysics. Wedin collects from the secondary literature the most important arguments for incompatibilism, and offers some proposals for restoring their harmony. While admitting the evident differences in the way Aristotle treats the question of substance in each treatise, Wedin is keen to argue that these differences are not sufficient to conclude that the treatises are incompatible. Wedin singles out for particular attention, and criticism, Michael Frede and Gunther Patzig's account of Metaphysics Zeta, according to which the primary substance of the Metaphysics and the basic subject of predications is the form. Wedin considers two ‘philosophical’ arguments and one ‘Aristotelian’ argument for the subjecthood of forms, and argues that the textual evidence does not support the claim that form is the subject of accidents.

Wedin discusses Aristotle's claims in Metaphysics Zeta 6 that the essence of a thing is to be sought among its per se attributes, and that each thing that is primary and spoken of per se, e.g. primary substance, is the same as its essence. Wedin argues that the Zeta 6 Thesis, i.e. that the essence of a thing is the thing's immediate essence, is a crucial requirement of the explanatory role of essence as the substance of c‐substances. According to Wedin, Aristotle introduces this requirement in order to establish that a thing's essence cannot depend on another essence. Form must be the essence; if form cannot explain the nature of the thing of which it is the form, there would be the threat of a regress of explanatory forms. At the end of the chapter, Wedin considers the problem that the identity of a thing and its essence is a requirement that can be met by non‐substance items, but he denies that this leads to a dilution of the conception of substance.

Wedin argues, against prevailing opinions, that Aristotle's account of homonymy, synonymy, and paronymy, with which the Categories begins, must be understood as an integral part of the treatise. The three ‘onymyies’, as Wedin calls them, are grouping principles, or one‐over‐many principles, that each collect a number of items under a single term. Wedin focuses on synonymy in particular, because it enables Aristotle to construct a theory of the fundamental kinds of things that are, and as such provides the basis for the system of the categories. For Wedin, the Categories is not just concerned with classification but also with ontology and semantics: it offers a theory about the underlying ontological implications of standard categorical statements, with the aim of determining what must exist, and in what relations these things must stand, in order for the statements to be true.

This paper raises some difficulties with the strategy suggested in Robert Nozick’s Philosophical Explanations for explaining why there is something rather than nothing. I am concerned less with his adoption of an egalitarian, as opposed to inegalitarian, explanatory stance (the net effect of which is to detach for independent consideration the question, “Why is there something?”) than with his use of a crucial assumption in reasoning from the egalitarian point of view. I argue that this assumption, that all possibilities exist, is fatally ambiguous, that the persuasiveness of Nozick’s reasoning depends on at once assuming and blurring the difference between the predicates “does not exist” and “nonexists” and that the attempt to wed a priori reasoning and a posteriori (mystical) practice fails.

Wedin addresses the debate over whether nonsubstantial individuals, that inhere in a subject but are not said of a subject, i.e. accidents, such as the pallor of Socrates, are nonrecurring particulars or a kind of determinate universal. Wedin examines the secondary literature on this topic and divides it into two schools of thought, determined by the contributions of J.L. Ackrill and G.E.L. Owen. According to Ackrill, individuals in non‐substance categories are particular to the substance they are in; Owen critiques Ackrill's view, and proposes that these items can recur in more than one subject and hence are a sort of universal. Wedin finds Owen's thesis unsatisfactory, even after supplementing it with an improved version due to Michael Frede; instead, Wedin argues for a revised version of Ackrill's interpretation of nonsubstantial individuals as nonrecurrent particulars. According to Wedin, Aristotle is committed to individuals only—e.g. to Socrates and to the particular bit of pallor in him: this conclusion has an important bearing on the ontological status of individuals and on the primacy of substance to nonsubstantial items.

Aristotle claims in Metaphysics Z.17 that form is both a cause and principle of c‐substances. In this chapter, Wedin argues that the explanatory, or causal, role of form is in the background of the entire discussion, and indeed directs much of the argumentation of Metaphysics Zeta. Form is the cause of some matter being a unity and not a heap, because form alone explains how the material parts of a thing are united in a single whole. Wedin draws together the main results of the preceding investigation of Zeta—that form is essence, that form must not contain matter or actual parts, and that form must not be a certain kind of universal—and he argues that these constraints on form are designed to serve the explanatory role that Aristotle explicitly gives to form in Z.17. Wedin emphasizes that the notions isolated in the examination of the earlier chapters, such as the purity of form, weak proscription, and dual complexity, each contribute to the account of form as the explanatory principle of c‐substance.