Hi, everyone I was directed here by a poster in another thread and thought I'd post my question to you guys in this area of the forums. I had some questions about Mike Spivak's math textbooks. It was alluded to in another thread that his books are quite difficult. Yet, from what I can gather, they seem to also be popular. I'm curious what makes his books difficult and how they may differ from other math textbooks used in college. And, secondly, if I'm just starting Calculus, which of his books (if any) would fit my level of math (beginning Calculus I next Fall 2015 semester). Thank you all much!