I have close to zero idea what’s going on in the last chapter — which, fortunately, is pretty short. The earlier chapters are fantastic and, as an introduction for the lay reader, better than, say, The Calculus Lifesaver. Granted, they have different target audiences: the former is like a pamphlet, while the latter is almost a tome. But this Very Short Introduction actually allows the reader to understand how mathematical analysis works — and, more importantly, why it is so relevant to other branches of science.
For instance, readers will feel that they understand Schrödinger’s equation, because the author explains what partial differential equations are and why they can model natural phenomena. It should be clear that the actual mathematics — although described in some detail and quite profusely — are meant to be beyond certain readers (readers like me; I’m a medical doctor by profession). Those expecting comprehensive proofs and derivations will be disappointed. But then, any reasonable person wouldn’t expect them from a book like this. Four stars.