I recently purchased Advance Calculus by Woods. Reading, "Surely you're Joking Mr. Feynman,' interested me about the unorthodox techniques Feynman learned by reading Woods. I'm a math major and my mathematics is pretty limited at this point. By the end of fall semester I should have learned Calculus 3 (MultiVariable) and ODE's. I do have Linear Algebra under my belt and find books like Friedberg, Keisler, Axler, and Lang readable. I won't necessarily use Woods until after May or June of next year. I purchased it because I saw prices heading in the 200 hundred range and found it for a steal at 70 dollars shipped. After my fall semester I plan to work through either Apostle or Spivak ( own both) and How To Prove It. If time permits I was thinking about going over some Polya books my teacher gave me, during the fall semester. This is in preparation for Analysis when I enter into the University. My education has been lacking but I have been able to learn a few things on my own out of self interest. I like to learn and am willing to work for it. What level is Advance Calculus by Woods pitched at? What are the requirements? Did I waste $70 dollars or is the books reputation well earned. Does anyone know of a book that explains epsilon-delta? My understanding of epsilon-delta is superficial one section in Stewart Calculus.