La teoria della sostanza di Aristotele e l’Accademia di Platone in Metafisica Z. Τὰ μετὰ τὰ φυσικά vs τὰ μετὰ τὰ μαθηματικά.

The subject of the present research work is the first of the so-called 'central books' of Aristotle's Metaphysics, Book Z. The aim is to show how the theory of substance developed in Metaph. Z constitutes a crucial stage in the more general process of de-construction and de-mathematization of the Platonic-academic system that occupies a substantial part of Aristotelian philosophical speculation in the Metaphysics. The continuous comparison between the status of natural substances and that of geometric mathematical entities is far from being accidental in the context of the investigation of substance in Metaph. Z. On the contrary, it stands as a programmatic choice oriented to place physics, and not the abstract model of mathematics, as the propaedeutic science that from natural substances - assumed as the main object of the examination of the book Z - leads to the causes and first principles of what is. In this sense, on a methodological level, the object of this thesis is not the book Z in its entirety, but rather the identification and exegesis of those passages where there is an instrumental use of mathematical-geometric examples, which Aristotle uses in the course of his investigation of substance to reaffirm the fundamental role of physics.