This dissertation offers a new and comprehensive analysis of Abū Naṣr al-Fārābī's cosmology by focusing on various important issues that have been largely neglected by the modern scholarship. It provides an examination of the physical, metaphysical, and astronomical aspects of al-Fārābī's cosmology by adopting a multidisciplinary approach that takes into account the history of philosophy and the history of astronomy. Accordingly, my dissertation explores how al-Fārābī attempted to reconcile features of Ptolemaic astronomy with Aristotelian and Neoplatonic theories, an endeavor which (...) resulted in the formulation of innovative cosmological ideas. Chapters I and II provide background information on al-Fārābī's activity as a commentator and his relation to the Greek commentatorial tradition and assess the relevant primary sources. In addition, they examine al-Fārābī's approach to cosmology and his scientific method in terms of both the Ptolemaic astronomical tradition and the Aristotelian corpus. Chapter III addresses problems related to the structure of al-Fārābī's cosmology, especially the origin of his ennadic cosmological model and his spherology. Particular attention is devoted to the question of how Aristotle's unmoved movers and Ptolemy's astronomical theories are reconciled. Chapters IV, V, and VI analyze the place of celestial matter, intellect, and motion respectively in al-Fārābī's cosmology and attempt to redefine the second teacher's relation to the various trends of Greek philosophy. The study stresses al-Fārābī's connection with the Neoplatonic and Peripatetic currents, particularly with thinkers such as Alexander of Aphrod. (shrink)

RésuméIl est bien connu que les notions detaṣawwur(conceptualisation) et detaṣdīq(assentiment) sont tout à fait centrales dans l’épistémologie de la philosophie arabo-islamique. La “conceptualisation” désigne la définition d'un objet de connaissance, et l’“assentiment” la reconnaissance de la véracité de la définition, par un raisonnement d'un certain type. Parmi les auteurs ayant traité ces deux thèmes le plus en profondeur figure al-Fārābī, qui a exercé sur Ibn Bājja une influence décisive. Cet article analyse les passages relatifs àtaṣawwurettaṣdīqdans les notes d'Ibn Bājja aux (...) écrits de logique et de méthodologie scientifique d'al-Fārābī, en particulier ses gloses auKitāb al-Burhān. On montre ainsi qu'Ibn Bājja a parfaitement saisi l'importance de ces deux termes dans la lecture farabienne de la méthode scientifique aristotélicienne, et qu'il les a employés pour traiter de certaines activités mentales. En effet ces deux notions, centrales chez Ibn Bājja, sont à la base de certaines de ses œuvres les plus fameuses. (shrink)

RésuméLe présent article propose la liste des œuvres médicales composées par Ibn Bājja, donne une présentation synthétique de celles qui nous ont été transmises et étudie le métacommentaire au commentaire de Galien sur lesAphorismesd'Hippocrate (Sharḥ fī al-Fuṣūl). Ce texte montre une influence profonde d'al- Fārābī, en particulier dans sa conception de l'expérience médicale, qui remonte à la façon dont ce dernier construit l'expérience (tajriba) comme le procédé inductif, décrit par Aristote dans lesSeconds Analytiques, produisant les prémisses de la démonstration. Sur (...) cette base, Ibn Bājja défend la pertinence d'une médecine moins scolastique et plus empirique, une position dont Ibn Rushd se fera l'écho. Des similitudes entre le texte d'Ibn Bājja et leK. al-Kulliyyāt fī al-ṭibbd'Ibn Rushd suggèrent que celui-ci avait lu leSharḥ fī al-Fuṣūl. Cette œuvre, en outre, pourrait bien attester que la dissection humaine était pratiquée à l'époque d'Ibn Bājja. (shrink)

En el libro I de su Comentario a los Analíticos Posteriores, Tomás de Aquino explica que toda demostración supone la existencia de principios evidentes e indemostrables que aseguren la certeza de las conclusiones. Para garantizar la existencia de verdades ciertas e indemostrables, introduce la idea de las proposiciones per se notae. Estas proposiciones son típicamente caracterizadas por tener un predicado que forma parte del contenido inteligible del sujeto, es decir, por ser proposiciones analíticas. Ahora bien, al final del libro II, (...) cuando explica cómo se obtienen los principios de las demostraciones, la doctrina expuesta no parece ser perfectamente congruente con la de las proposiciones per se notae, por describir un proceso inductivo más apto para explicar el surgimiento de proposiciones no analíticas. El objetivo del este artículo es proponer una solución de este problema, distinguiendo entre dos tipos de principio. La pertinencia de tal distinción se intentará demostrar comentando algunos textos de Roberto Grosseteste y Alberto Magno. (shrink)

There is a disagreement among contemporary commentators about Avicena's view of the theoretical intellect in "Kitāb alnafs". Is its activity performed by an internal sense helped by the intellect, or is it a activity proper of the intellect independently of material forms? Some passages of V.5 and V.6 suggest that both elements are necessary to the knowledge: unifying the multiplicity and multiplying the unity; in others words, it is not enough that the intellect conceptualizes the minor and major terms of (...) the syllogism, it also needs to intuit the middle term. (shrink)

This article argues that a fragment from a lost treatise by Abū Bakr al-Rāzī (d. 925) is preserved in the Book on Morphology Kitāb al-Taṣrīf) by Ps-Ǧābir ibn Ḥayyān. Paul Kraus reached the conclusion that the collection to which this book belongs was written between the end of the ninth and the beginning of the tenth century AD. This fragment represents the first attempt – to our knowledge – to analyze the logical structure of sign-based inference in Arabic, which is (...) known as istidlāl bi-al-šāhid ʿalā al-ġāʾib among theologians and philosophers. The author distinguishes between sign-inferences based on homogeneity (al-muǧānasa), course of habit (maǧrā al-ʿāda) and traces (āṯār). After providing a translation of the fragment, the first part of this paper argues that its author is Abū Bakr al-Rāzī. My argument is based on a comparison between this text and a passage from the Doubts About Galen, which is also by Abū Bakr al-Rāzī. I hypothesize that at least two other fragments from the same work or from different works by Abū Bakr al-Rāzī are preserved in the corpus attributed to Ps-Ǧābir. The second part of the paper aims to reconstruct Abū Bakr al-Rāzī’s theory of sign-inference. In so doing, I show the historical influence that Hellenistic debates on sign-inference might have had on al-Rāzī, and I situate al-Rāzī’s theory in the context of the prominent use that the theologians of the kalām made of the istidlāl bi-al-šāhid ʿalā al-ġāʾib. To offer a more comprehensive reconstruction of al-Rāzī’s theory of sign-inference, this article compares the critical approach presented in the newly identified fragment with the epistemological framework outlined in the Doubts About Galen. Finally, this article shows that Abū Bakr al-Rāzī’s theory of sign-inference had a strong influence on al-Fārābī’s logical developments especially in his Epitome of the Prior Analytics, even if he does not acknowledge this intellectual debt. (shrink)