This is a translation of Iamblichus lecture notes on the foundational symbolism of the numbers, Iamblichus was highly inspired by the work of Nichomachus and includes numerous pieces quoted from his lost work 'Theology of Arithmetic' (hence the title of this book).

The fact that this translation is of lecture notes means it is relatively concise and to the point, which I personally liked. As other reviewers have noted, the commentary by Robin Waterfield is both extensive and insightful, it definitely makes the material much easier to digest. Highly recommended.

If you like this, I also recommend Nichomachus 'Manual of Harmonics' which discusses similar themes

The most valuable book I ever found on Pythagorean number philosophy, highly recommended, good luck at ever finding it in print!!!!

When I bought this book, I presumed I was buying a remotely dry and dull book of late Neoplatonic praddle on numbers. However it turns out this book is a copy of a copy of a copy model of Pythagoras and Plato/Plotinus in their philosophy of Emanation and necessity in their illuminating the werks (eklampsis/emanation) of the One, the Divine. What's better, is the pithiness of this book is astounding, with main content around 120 pages, its incredibly condensed and packed with revelations and connections leading to insights into Plato's ontology "old philosophical-contention mystery SOLVED by means of this very book, "Theology of Arithmetic"

Personally, I find the subtitle of this book should be: "THE KEY TO UNDERSTANDING THE NUMBER ONTOLOGY OF ALL OF PYTHAGOREANISM, PLATONISM AND NEOPLATONISM".

My copy of this book is so underlined and highlighted, I'm buying another copy of it.