Aristotle's Works: The Metaphysics

O presente artigo tem como objetivo principal esclarecer a concepção da tradição megárica acerca do conceito de capacidade (δύναμις), tal como apresentada no livro Theta da Metafísica de Aristóteles. A análise se faz necessária devido à falta de atenção aristotélica na formulação da tese adversária dos megáricos, pois em nenhum momento Aristóteles parece nos oferecer argumentos plausíveis que justifiquem de maneira adequada a tese de seus oponentes. Partindo desta dificuldade de reconstrução do argumento megárico e visando lhe oferecer uma maior (...) dignidade, o estudo irá, em primeiro lugar, destrinchar possíveis argumentos que sustentem a tese no contexto da referida obra. Em seguida, irá provar que, mesmo a tese megárica não sendo tão facilmente refutável como uma primeira leitura poderia sugerir, há em sua estrutura problemas graves, que se evidenciam diante da concepção aristotélica da capacidade. (shrink)

In book Λ. of the Metaphysics, Aristotle suggests that an unmoved, unmoving being (God) is the source of all movement in the cosmos. He explains that this being instigates movement through desire. But how does desire affect movement? And what would make Aristotle’s God an object of desire? I attend to both questions in this paper, arguing that God’s existence as pure actuality (energeia) is crucial to understanding God’s status as the primary and ultimate source of wonder, and that it (...) is as the ultimate source of wonder that we can make sense of how God affects desire. (shrink)

It is standardly held that Aristotle denies that artifacts are substances. There is no consensus on why this is so, and proposals include taking artifacts to lack autonomy, to be merely accidental unities, and to be impermanent. In this paper, I argue that Aristotle holds that artifacts are substances. However, where natural substances are absolutely fundamental, artifacts are merely relatively fundamental—like any substance, an artifact can ground such nonsubstances as its qualities; but artifacts are themselves partly grounded in natural substances. (...) Many contemporary metaphysicians view authorial intentions or communal recognition as an essential feature of most artifactual kinds. Drawing on Aristotle’s own examples of artifactual definitions, I note that there is little reason to ascribe this view to Aristotle. So Aristotle has the resources to hold that it is possible that there are kinds with both artifactual and non-artifactual members. (shrink)

While Aristotle provides the crucial testimonies for the paradoxes of motion, topos, and the falling millet seed, surprisingly he shows almost no interest in the paradoxes of plurality. For Plato, by contrast, the plurality paradoxes seem to be the central paradoxes of Zeno and Simplicius is our primary source for those. This paper investigates why the plurality paradoxes are not examined by Aristotle and argues that a close look at the context in which Aristotle discusses Zeno holds the answer to (...) this question. (shrink)

Nos Segundos Analíticos II.8-10, Aristóteles apresenta um modelo investigativo de descoberta da essência pela causa a partir de uma estrutura triádica: a demonstração silogística. Esse modelo explanatório-causal é colocado em prática em casos de processos naturais (e.g. eclipse, trovão) e, apesar de mencionadas, as substâncias sensíveis (e.g. homem) não são concretamente analisadas – algo que só se consolida nos livros centrais da Metafísica (mais especificamente, em Z.17) a partir da análise hilemórfica. Além disso, em Segundos Analíticos II.9, Aristóteles apresenta uma (...) restrição quanto ao domínio de aplicação do modelo: apenas os itens que possuem “causa diferente” (ἕτερον αἴτιον) são passíveis de análise nesses termos. Se, por um lado, o capítulo parece ser uma restrição ao caso específico das substâncias, não são explicitados quais itens possuem e quais não possuem “causa diferente”. Desse modo, é suscitada a questão: teria Aristóteles previsto a aplicação do modelo explanatório-causal às substâncias hilemórficas quando da elaboração dos Segundos Analíticos, ou sua utilização na Metafísica representaria uma reformulação posterior? Neste cenário, temos pelo menos duas hipóteses interpretativas: (i) uma leitura restritiva (ou desenvolvimentista), em que as substâncias não teriam sido previstas; (ii) uma leitura não-restritiva, que se opõe à primeira ao defender que as substâncias já estariam previstas na elaboração dos Segundos Analíticos, e sua omissão se daria por economia argumentativa. O objetivo do presente trabalho é apresentar a hipótese não-restritiva como uma solução para o problema do ἕτερον αἴτιον, defendendo uma aproximação entre a Metafísica e os Segundos Analíticos. (shrink)

I review Michael T. Ferejohn's "Formal Causes: Definition, Explanation, and Primacy in Socratic and Aristotelian Thought".

Based on the notion of proem as exposed in Aristotle’s Rhetoric, we examine in detail Metaph. A1. Our goal is to understand the argument contained in this chapter, as we also endeavour to show how the Stagirite introduces with uttermost caution the theme of wisdom [σοφία], that which is the incarnation of the preeminent science in the first book of the Metaphysics. The attention we devote to the proem of this work is explained by the importance we attribute, unlike much (...) of contemporary scholars, to σοφία, that is, the science of first causes and principles, which we consider to be, ultimately, the pivotal formulation of the supreme science in the Metaphysics. (shrink)

Translation of Aristotle's Metaphysics I-III into Portuguese, with a few notes and introduction. The translation, which was made at 2007, is preliminary and its publication was intended to provide a didactic tool for courses as well as a provisional resource in research seminars. It needs some revision. I am currently working (slowly...) on the revision of the translation and a new revised one will surely appear at some point.

In his commentary on Aristotle's Metaphysics, Alexander of Aphrodisias quotes from Aristotle's now-lost work On the Ideas -- his account of the arguments offered by Plato for the theory of Forms and his criticisms of those arguments. This paper considers one of these arguments, the Argument from Relatives (ta pros ti). It considers how Plato argued for Forms or Ideas such as the Large Itself, the Just Itself and so on and whether Plato supposed that there were Forms corresponding to (...) sortal terms like Man. (shrink)

Translation of Aristotle's Metaphysics I-III into Portuguese, with a few notes and introduction. The translation, which was made at 2007, is preliminary and its publication was intended to provide a didactic tool for courses as well as a provisional resource in research seminars. It needs some revision. I am currently working (slowly...) on the revision of the translation and a new revised one will surely appear at some point.

According to some critics, Aristotle’s elenctic defence (elenchos, elenchus) of the Law of Non-Contradiction (Metaphysics IV) would be ineffective because it viciously begs the question. After briefly recalling the elenctic refutation of the denier of the Law of Non-Contradiction, I will first focus on Filippo Costantini’s objection to the elenchus, which, in turn, is based on the dialetheic account of negation developed by Graham Priest. Then, I will argue that there is at least one reading of the elenchus that might (...) not be viciously question-begging. In doing so, I will leverage, reinterpret and adjust the distinction between two senses of epistemic dependence, offered by Noah Lemos and originally based on some thoughts about George Edward Moore’s ‘proof of an external world.’ The key point of my counter-objection to recover the elenchus is to use the distinction between a necessary-condition relation between propositions (p only if q) and a grounding relation between facts (the fact that an epistemic agent S believes that p is grounded in the fact that S believes that q), where p and q are the content of S’s beliefs. (shrink)

Some of Aristotle’s statements about the indemonstrability of the Principle of Non-Contradiction (PNC) in Metaphysics Γ 4 merit more attention. The consensus seems to be that Aristotle provides two arguments against the demonstrability of the PNC, with one located in Γ 3 and the other found in the first paragraph of Γ 4. In this article, I argue that Aristotle also relies upon a third argument for the same conclusion: the argument from truth. Although Aristotle does not explicitly state this (...) argument, it is the best argument that he could use to defend some of his statements in the second paragraph of Γ 4. Since the argument relies on only a few of Aristotle’s core views about truth, I propose that it is faithful to his considered position throughout his corpus, and it may be the strongest argument he could offer for the indemonstrability of the PNC. (shrink)

Translation of Aristotle's Metaphysics IV and VI, with notes. The translation is preliminary and intended as a provisional teaching tool to be also used in seminars and discussions with peers in order to reach a more elaborated version.

My object is Aristotle's discussion of principle of non-contradiction in the first stretch of Metaphysics IV.4. My main focus rests on the connections between Aristotle's discussion of the principle and some key notions of his (explicit or implied) semantics.

In both Metaphysics Γ 4 and 5 Aristotle argues that Protagoras is committed to the view that all contradictions are true. Yet Aristotle’s arguments are not transparent, and later, in Γ 6, he provides Protagoras with a way to escape contradictions. In this paper I try to understand Aristotle’s arguments. After examining a number of possible solutions, I conclude that the best way of explaining them is to (a) recognize that Aristotle is discussing a number of Protagorean opponents, and (b) (...) import another of Protagoras’ views, namely the claim that there are always two logoi opposed to one another. (shrink)

This paper deals with the strategy of defence that Aristotle dedicates to the principle of contradiction; the analysis is concentrated on passages of Metaphysics Gamma 4. The main thesis of the paper is that Aristotle’s strategy is an ontological, and therefore not only a logical, one: the principle is defended on the basis of the, from an ontological point of view, unacceptable consequences which would arise in case of the absence of the principle itself. These consequences are, for instance, the (...) disappearance of properties, of essences, of individual entities and of the plurality of essentially distinguishable entities, since the contents of the properties, the role of properties as essences and the constitution of the individual entities cannot hold, if the principle of contradiction does not hold. The principle of contradiction is, therefore, not only a logical principle: it is the ontological presupposition of the whole reality; without it there is no entity. (shrink)

In this contribution, I explore the treatment that Plato devotes to Protagoras’ relativism in the first section of the Theaetetus (151 E 1–186 E 12) where, among other things, the definition that knowledge is perception is put under scrutiny. What I aim to do is to understand the subtlety of Plato’s argument about Protagorean relativism and, at the same time, to assess its philosophical significance by revealing the inextric¬ability of ontological and epistemological aspects on which it is built (for this (...) latter aspect, I refer to contemporary discussions of relativism, mainly to Margolis’ robust relativism). I then turn to Aristotle’s treatment of Protagoras’ relativism in Metaphysics Γ, sections 5 and 6, in order to show that Plato and Aristotle surprisingly share the same view as regards the philosophical content of Protagoras’ relativism (in doing so, I take position against the standard opinion among scholars that Plato and Aristotle understand Protagoras’ relativism in different, even incompatible, ways). What I ultimately aim to demonstrate is that Protagoras’ relativism, as understood by both Plato and Aristotle, is a coherent, even attractive, philosophical position. (shrink)

This is a translation of Aristotle's Metaphysics V (Delta) 18-30 into Portuguese. (A different publication, with a different DOI, presents the commentaries that accompany this translation).

These are the commentaries (or notes) for Aristotle's Metaphysics V (Delta) 18-30. This file must be read together with the translation into Portuguese, which has been published as a different item, with a different DOI. In the Introduction, I discuss many issues about Aristotle's jargon, Aristotle's style and Aristotle's awareness of many philosophical problems that nowadays we locate within the branch Philosophy of Language.

Eu examino cada meandro do esforço de Aristóteles identificar vários usos de termos filosóficos essenciais em sua Metafísica, V.9-17.

Translation of Aristotle's Metaphysics V.1-8 with a few notes.

Is there grounding in ancient philosophy? To ask a related but different question: is grounding a useful tool for the scholar of ancient philosophy? These questions are difficult, and my goal in this paper is not so much to give definitive answers as to clarify the questions. I hope to direct the student of contemporary metaphysics towards passages where it may be fruitful to look for historical precedent. But I also hope to offer the student of ancient philosophy some guidance (...) on when drawing on the contemporary discussion of grounding may be beneficial. (shrink)

Tradução dos livros Z e H da Metafísica de Aristóteles, com introdução e notas. Translation of Aristotle's Metaphysics Books VII and VIII into Portuguese, with Introduction and Notes.

This PhD thesis is a careful discussion of Aristotle's Metaphysics VII (Zeta) almost line by line (or at least argument by argument). It might be interesting to know that a revised and shortened version of it was published as a book in Portuguese, "As Noções Aristotélicas de Substância e Essência", Campinas: Editora da Unicamp, 2008. Actually, I believe the original version of the PhD thesis has been superseded by the book.

This paper is my first effort to revaluate the disagreement between two central texts for Aristotle's the conception of ousia: Categories and Metaphysics VII. Scholars have taken chapter Zeta-3 as a payment of the debt with the Categories, so that the hylomorphic analysis of the composite substance would require a revision of the subject-criterion, now improved by the addition of the “a this” and “separate” criterion. This paper, however, downgrades the importance of the Categories for understanding Aristotle's Metaphysics Z. The (...) two texts are dealing with different arguments and are not incompatible with one another. I myself consider this paper somehow obsolete, for I have returned to the same subject more than once: in my 2003 paper on Z-3 and, most importantly, on my Book 'As Noções Aristotélicas de Substância e Essência' (2008). (shrink)

In almost every handbook and in almost every history of philosophy you will find the thesis that Aristotle in Metaphysics Z has developed a theory about substance – an imperfect one unfortunately. From the Middle Ages until now this has been the most widely accepted claim about this book. Because the basis for this claim is not so easy to find in the text, there is a dispute about the question what a substance really is and ”which things“ are substances. (...) But the theory itself remains. If you engage to clear the field of problems in which this book has its roots, you will see apories developed by Plato in his dialogue Sophistes, mainly the apory in the middle of the dialogue. Here the guest from Elea is led to the question ”What in the world do we have to understand by the term ’to be’?“ ”...For you evidently understood the matter long ago; we, on the contrary, before thought we understood, but now are in trouble about it.“ Aristotle repeats this question, the question about being, on a new level and with new conceptual tools. In the Topics he develops what I call the ”topical approach.“ The use of it is suppported by a new type of concepts, the quotations (e. g. to ti estin: ”Say what you mean, if you ask 'What is this?'“ The standard translation ”essence“ makes impossible to see the genuine meaning of the term.) In Metaphysics Z he puts in concrete terms what in Metaphysics Λ was just a sketch of his speculation about ”to be.“ Seeing this background, it becomes clear that Metaphysics Z never contains the expected theory, which many allege that Aristotle is defending. This is no more than the remains of the pastristic and medieval interpretation. The German translation with commentary which I submit with this book, and an extensive introduction to these questions, should contribute to the destruction of this part of metaphysics. (shrink)

The relation of ontological dependence or grounding, expressed by the terminology of separation and priority in substance, plays a central role in Aristotle’s Categories, Metaphysics, De Anima and elsewhere. The article discusses three current interpretations of this terminology. These are drawn along the lines of, respectively, modal-existential ontological dependence, essential ontological dependence, and grounding or metaphysical explanation. I provide an opinionated introduction to the topic, raising the main interpretative questions, laying out a few of the exegetical and philosophical options that (...) influence one’s reading, and locating questions of Aristotle scholarship within the discussion of ontological dependence and grounding in contemporary metaphysics. (shrink)

Aristotle holds that individual substances are ontologically independent from nonsubstances and universal substances but that non-substances and universal substances are ontologically dependent on substances. There is then an asymmetry between individual substances and other kinds of beings with respect to ontological dependence. Under what could plausibly be called the standard interpretation, the ontological independence ascribed to individual substances and denied of non-substances and universal substances is a capacity for independent existence. There is, however, a tension between this interpretation and the (...) asymmetry between individual substances and the other kinds of entities with respect to ontological independence. I will propose an alternative interpretation: to weaken the relevant notion of ontological independence from a capacity for independent existence to the independent possession of a certain ontological status. (shrink)

Translation of Aristotle's Metaphysics IV and VI, with notes. The translation is preliminary and intended as a provisional teaching tool to be also used in seminars and discussions with peers in order to reach a more elaborated version.

Aristotelian hylemorphism not only concerns the relationship between sensible matter and form, but also applies to the relationship between the 'parts' of form. By analyzing this latter case, this book aims to show the full explanatory and unifying power of hylemorphism.

This book investigates what change is, according to Aristotle, and how it affects his conception of being. Mark Sentesy argues that change leads Aristotle to develop first-order metaphysical concepts such as matter, potency, actuality, sources of being, and the teleology of emerging things. He shows that Aristotle’s distinctive ontological claim—that being is inescapably diverse in kind—is anchored in his argument for the existence of change. -/- Aristotle may be the only thinker to have given a noncircular definition of change. When (...) he gave this definition, arguing that change is real was a losing proposition. To show that it exists, he had to rework the way philosophers understood reality. His groundbreaking analysis of change has long been interpreted through a Platonist lens, however, in which being is conceived as unchanging. Offering a comprehensive reexamination of the relationship between change and being in Aristotle, Sentesy makes an important contribution to scholarship on Aristotle, ancient philosophy, the history and philosophy of science, and metaphysics. (shrink)

Tradução dos livros Z e H da Metafísica de Aristóteles, com introdução e notas. Translation of Aristotle's Metaphysics Books VII and VIII into Portuguese, with Introduction and Notes.

In this paper, I compare the Megarian thesis of Metaphysics IX 3 with other sources on the Megarians in order to clarify two questions: that of the unity and nature of the so-called Megarian school and that of Aristotle’s broader argument in IX 3. I first review the disputed issue of the status of the Megarian school and then examine two hypotheses regarding the identity behind Aristotle’s allusion in IX 3. Third, I explore the connection between Megarianism and Plato’s Euthydemus, (...) a task that helps us to contextualize Aristotle’s anti-Megarian polemic. Lastly, I build on the preceding argument in a re-examination of the Eleatic hypothesis with regard both to the Megarians as a whole and to the thesis that Aristotle transmits. (shrink)

In this paper, I argue that Aristotle was already aware in his earlier texts of the fundamental distinction between motion and activity and of the criterion which structures this contrast. Moreover, I will present textual evidence which suggests that Aristotle’s original concept of ἐνέργεια applies primarily to activities which contain their ends in themselves, and not to motions, which are different from their ends.

This paper offers an interpretation of Aristotle’s concepts of dynamis and energeia (commonly translated as potentiality and actuality), and of the thematic progression of Metaphysics IX. I first raise the question of where motion fits in Aristotle’s categories and argue that the locus of motion in the system of categories are the categories of doing and suffering, in which case dynamis and energeia in respect of motion can also be understood as the dynamis and energeia of doing and suffering. Next, (...) I argue that the analogy that Aristotle draws in IX.6 is an analogy between the dynamis and energeia of doing and suffering and the dynamis and energeia of substance. Finally, I try to show that it is this analogy between the kinetic and non-kinetic variants of dynamis and energeia—and not the distinction between end-inclusive and end-exclusive activities—that provides the key to understanding the structure of Metaphysics IX. (shrink)

The belief that Aristotle opposes potency (dunamis) to actuality (energeia or entelecheia) has gone untested. This essay defines and distinguishes forms of the Opposition Hypothesis—the Actualization, Privation, and Modal—examining the texts and arguments adduced to support them. Using Aristotle’s own account of opposition, the texts appear instead to show that potency and actuality are compatible, while arguments for their opposition produce intractable problems. Notably, Aristotle’s refutation of the Megarian Identity Hypothesis applies with equal or greater force to the Opposition Hypothesis. (...) For Aristotle, then, potency and actuality are compatible. (shrink)

Translation of Aristotle’s Metaphysics IX and X (Theta & Iota) into Portuguese, with a few notes, experimental glossary and introduction. The translation, which was made at 2004, is preliminary and its publication was intended to provide a didactic tool for courses as well as a provisional resource in research seminars. It needs some revision. I am currently working (slowly...) on the revision of the translation and a new revised one will surely appear at some point.

Of Aristotle’s core terms, potency (dunamis) and actuality (energeia) are among the most important. But when we attempt to understand what they mean, we face the following problem: their primary meaning is movement, as a source (dunamis) or as movement itself (energeia). We therefore have to understand movement in order to understand them. But the structure of movement is itself articulated using these terms: it is the activity of a potential being, as potent. This paper examines this hermeneutic circle, and (...) works out a strategy for reading Aristotle based on his conception of our epistemological predicament. This hermeneutic approach helps us gain access to the phenomena of movement and its sources (potency, and energeia). The paper closes with a review of the conceptual resources we deploy to think about movement: homogeneity, space and time, impulse, relativity, the blend of sameness and difference, and being and non-being. Showing that Aristotle uses none of these clears the landscape for a fresh inquiry into his account of movement. (shrink)

Com o propósito de analisar a relação entre ser e movimento a partir dos conceitos de ato e potência, elaboramos um mapeamento do livro Θ da Metafísica, capaz de orientar o entendimento de sua estrutura central. Visto como um dos modos de se dizer o ser, o ser em ato e em potência é parte integrante e fundamental da investigação metafísica. A distinção entre ser em ato e em potência pretende resolver o clássico problema do não-ser que vem a ser, (...) mostrando como o não-ser é apenas não-ser ainda em ato, mas já é ser em potência e este guarda as condições para sua necessária atualização. A reconstrução argumentativa de Θ procurou ressaltar três aspectos principais: (1) Ato e potência funcionam como um elemento de conexão entre as outras ciências – práticas, produtivas e teóricas – que são subordinadas à Ciência do Ser enquanto Ser, a Metafísica. (2) Há uma forte relação entre o par conceitual ato/potência e os outros conceitos fundamentais da filosofia aristotélica, tais como: substância, forma, matéria, ação, bem, natureza e fim. Desse modo, ato e potência somente serão plenamente compreendidos se também forem considerados esses outros conceitos. (3) Há uma relação direta entre os dois sentidos em que ato e potência podem ser entendidos - o cinético e o metafísico - e a seguinte divisão interna de Θ: de Θ1 a Θ5 a investigação está centrada sob o ângulo do movimento, é o momento cinético, em que Aristóteles dedica-se mais à análise da potência caracterizada como um princípio de movimento. (shrink)

La distinción entre acto y movimiento que enuncia Aristóteles en Metafísica IX 6, 1048b18–35, ha causado una gran polémica entre los intérpretes aristotélicos contemporáneos. En este artículo defendemos que la distinción no está en conflicto con el resto del libro IX, ni con el Corpus Aristotelicum en general. De hecho, aparece también en ética a Nicómaco X 4 y De Anima III 7. Además, sin esta distinción no sería posible entender la inmovilidad del primer motor defendida en Metafísica XII, puesto (...) que allí se afirma que este motor es vida y que su actividad es placer y pensamiento. -/- Palabras clave: acto, movimiento, pasaje, actividad, metafísica -/- The distinction between act and movement stated in Metaphysics IX 6, 1048b18–35, has been the subject of a major controversy among contemporary interpreters. In this article I defend that the distinction does not conflict with the rest of book IX, nor with the Corpus Aristotelicum in general. Indeed, the distinction also appears in Nicomachean Ethics X 4 and in De Anima III 7. Furthermore, without this distinction the immobility of the first mover defended in Metaphysics XII would be unintelligible, since Aristotle says that the first mover is life, and that his activity is pleasure and thinking. -/- Key words: act, movement, passage, activity, metaphysics. (shrink)

Mitä oleva on? Omaisuus ja elämä pureutuu tähän filosofian peruskysymykseen seuraten kahta länsimaisen filosofian jättiläistä, Aristotelestä ja Heideggeria. Siinä missä Aristoteles kysyy olevaa substantiivina ja tilana, etsii Heidegger olemisen mieltä verbinä ja tapahtumana. Nämä kaksi merkitystä löytyvät myös suomen olla-verbistä: "omistaa jotakin" ja "olla olemassa, elossa". Omaisuus ja elämä antavat peruslähtökohdat olevan tulkitsemiselle. Kirja vie lukijansa filosofian kreikkalaisille juurille ja sen uusimpiin, Heideggerin avaamiin mahdollisuuksiin.

In 'Metaphysics IX.6' (1048b 18-35) Aristotle presents a test to distinguish between "kinesis" and "energeia," based on relations between the perfective and the imperfective aspect of the verb. This passage has been interpreted as drawing a linguistic distinction between classes of verbs (e.g., stative verbs) by means of a linguistic criterion (Ackrill, Graham). But such an interpretation is in conflict with the text. Aristotle's test must, therefore, be understood as a metaphysical criterion between items in the world (rather than lingual (...) items) by means of a metaphysical criterion, exploiting properties of these items. These items are events, and 'Metaphysics IX.6' exhibits Aristotle's awareness to certain topics discussed in modern event ontology. (shrink)

Translation of Aristotle’s Metaphysics IX and X (Theta & Iota) into Portuguese, with a few notes, experimental glossary and introduction. The translation, which was made at 2004, is preliminary and its publication was intended to provide a didactic tool for courses as well as a provisional resource in research seminars. It needs some revision. I am currently working (slowly...) on the revision of the translation and a new revised one will surely appear at some point.

La investigación asume el estudio de la " otredad " en el pensamiento aristo-télico, profundizando el carácter del θεός. Se procura responder a la pregun-ta: ¿Qué es " otro " (ἄλλος)? y ¿Cómo es entendida la otredad (ἑτερότης) por Aristóteles? para así, en un último escenario. esbozar una reflexión a propó-sito de θεός como otredad (ἑτερότης), radicalizando las tesis aristotélicas.