The reality of numbers, Zellini argues, comes not from their abstract definition but from what he calls their calculability. Seen this way, not all numbers are alike, nor are they equally real. Principles of algorithmic efficiency place hard limits on what can be calculated and with what precision. Though Zellini illustrates what these limits involve, his discussion is not a field guide to the ontological varieties of numbers, but rather a primer for what such a guide might consider, or perhaps a case for the very idea of such a guide.
— Read on www.spectator.co.uk/article/let-s-leave-philosophers-to-puzzle-over-the-reality-of-numbers