Jon McGinnis

This study looks at the position of two of the Middle Ages’ towering intellectual figures, Avicenna and Aquinas, and their arguments concerning the age of the cosmos. The primary focus is the nature of possibility and whether possibility is such that God can create it or such that its “existence” has some degree of independence from God’s creative act. It is shown how one’s answer to this initial question in turn has enormous ramifications on a number of other, core theological topics. These issues include one’s position concerning whether the cosmos necessarily existed infinitely into the past or may have been created at some finite point in the past; how one understands divine simplicity; what constitutes omnipotence; and even the place of rhetoric in theological and philosophical discussions

The paper treats Avicenna’s ’metaphysical’ argument for the existence of God and the modal metaphysics that underpins it. Earlier analyses of modalities attempted to reduce necessity, possibility and impossibility to nonmodal elements, which was done most commonly by appealing to a temporal frequency model of modalities. In contrast, Avicenna believed that modalities were an inherent feature of existence, and so just as there is nothing more basic than existence, so likewise there is nothing more basic in term of which modalities can be explained. The article concludes by considering how Avicenna’s modal metaphysics in turn provides him the means to show the absolute and nonconditional necessity of God, as opposed to the conditional necessity of earlier ’physical’ arguments

Avicenna's discussion of space is found in his comments on Aristotle's account of place. Aristotle identified four candidates for place: a body's matter, form, the occupied space, or the limits of the containing body, and opted for the last. Neoplatonic commentators argued contra Aristotle that a thing's place is the space it occupied. Space for these Neoplatonists is something possessing dimensions and distinct from any body that occupies it, even if never devoid of body. Avicenna argues that this Neoplatonic notion of space is untenable on the basis of three arguments. In general he maintains that bodies' impenetrability is explained by reference to dimensionality. Consequently, if it is dimensionality that explains impenetrability, and yet as the Neoplatonists hold space inherently possesses dimensions, material bodies could never interpenetrate space and so occupy it and thus bodies could never have a place. The conclusion is patently false. In additions Avicenna argues that the method used to arrive at the possibility of space is illicit, and so Neoplatonist cannot show that space is even possible. Thus, concludes Avicenna, Aristotle's initial account must be correct. The paper outlines the historical context of this debate and then treats Avicenna's arguments against space in detail.

Avicenna’s _Physics_ is the very first volume that he wrote when he began his monumental encyclopedia of science and philosophy, _The_ _Healing_. Avicenna’s reasons for beginning with _Physics_ are numerous: it offers up the principles needed to understand such special natural sciences as psychology; it sets up many of the problems that take center stage in his _Metaphysics_; and it provides concrete examples of many of the abstract analytical tools that he would develop later in _Logic_. While Avicenna’s _Physics _roughly follows the thought of Aristotle’s _Physics_, with its emphasis on natural causes, the nature of motion, and the conditions necessary for motion, the work is hardly derivative. It represents arguably the most brilliant mind of late antiquity grappling with and rethinking the entire tradition of natural philosophy inherited from the Greeks as well as the physical thought of Muslim speculative theologians. As such, _Physics_ is essential reading for anyone interested in understanding Avicenna’s complete philosophical system, the history of science, or the history of ideas.

Il naturale senso della logica in relazione alla scienza è quello di fornire un linguaggio alle acquisizioni epistemologiche: tale sembra essere il senso assegnatogli anche da Avicenna in al-Mantiq. La questione in realtà è molto più profonda: quale relazione c'è fra gli universali predicabili e gli oggetti della scienza? Attraverso l'esame della questione quale è delineata nel Madkhal, in particolare in merito al genere e alla differenza, e il loro ruolo nelle scienze in alcuni passaggi del Kitab al-Burhan, l'A. verifica l'applicazione delle considerazioni teoretiche in un problema fisico pratico affrontato nel Kitab-al-Tabi'iyat

The forma fluens/fluxus formae debate concerns the question as to whether motion is something distinct from the body in motion, the flow of a distinct form identified with motion , or nothing more than the successive states of the body in motion, the flow of some form found in one of Aristotle's ten categories . Although Albertus Magnus introduced this debate to the Latin West he drew his inspiration from Avicenna. This study argues that Albertus misclassified Avicenna's position, since Albertus could not conceptualize motion at an instant, whereas it is claimed here this was the very position Avicenna adopted. The paper includes an overview of Albertus's discussion and a brief survey of the Avicennan sources upon which Albertus drew. The heart of the paper treats Avicenna's analysis of motion at an instant. Avicenna's general argument was that since spatial points have no extremities, nothing in principle prevents a moving object from being at a spatial point for more than an instant, understood as a limit. It is then argued that Avicenna had the philosophical machinery to make sense of a limit, albeit not in mathematical terms, but in terms of an Aristotelian potential infinite