For me it was Apostol's Calculus Vol 1 and Vol 2. I am searching for books in mathematics that teach both the how and the why, here: https://news.ycombinator.c

For me it was Apostol's Calculus Vol 1 and Vol 2. I am searching for books in mathematics that teach both the how and the why, here: https://news.ycombinator.com/item?id=31650459 https://news.ycombinator.com/item?id=31650459 I hope to get some insightful answers soon.