I've read this article countless times when looking for his textbook recommendations, cited at the end. All excellent. While I also appreciate abstraction, ver

I've read this article countless times when looking for his textbook recommendations, cited at the end. All excellent. While I also appreciate abstraction, very often mathematics is taught at the wrong level of abstraction. A book I like a lot, in the spirit of his recommendations, is Hubbard & Hubbard.