I'm of two minds about this book. On the one hand it took things slow and gave many worked examples, which I liked. One the other hand I hated their choice of notation and lack of rigour. Ultimately I feel that this book failed to give me a clear understanding of the grad, div, and curl operators, what they do, and how to use them, which was my goal in reading this text.
Buen libro, se aprende mucho de él. Un poco confusa la narrativa, difícil de comprender la historia que intenta transmitir el autor. No lo volvería a leer, me dio migraña.