 Few of Iamblichus’ works are preserved in the direct manuscript tradition. Four of these texts pertain to a summa On Pythagoreanism (conflicting testimonies exist about its title: cf. O’Meara 1989: 32–33): On the Pythagorean Life; the Protrepticus; On General Mathematical Science; and an Introduction to Arithmetic based on Nicomachus of Gerasa’s treatise of the same name. Sadly, they are for the most part impersonal works: the Protrepticus consists in lengthy quotations from previous hortatory literature, and its interest mostly lies in the fact that it provides evidence for valuable lost works (most notably Aristotle’s own Protrepticus and the so-called Anonymus Iamblichi), while On the Pythagorean Life plagiarizes previous biographies of the master, although it certainly contains valuable insights on Iamblichus’ conception of the “divine man”. Neither of these works seems to have had any impact over the subsequent course of philosophy, whereas On General Mathematical Science was at least a formative influence on Proclus’ commentary to Euclid’s Elements, as well as on Syrianus’ commentary on Metaphysics Μ–Ν. It also provides the basic material for the reconstruction of Iamblichus’ philosophy of mathematics (see below,  Section 4).  For a general characterization of On Pythagoreanism and its context, see Huffman (2006 [2019: sect. 4.4]).