Has anyone ever seen this? It's an interactive online textbook in analysis in a single real variable. As an undergrad, I wussed out and took Advanced Calculus instead of Analysis, and this is a subject I've been meaning to learn. Is anyone interested in going through this? http://www.shu.edu/projects/reals [Broken] It looks like it could serve as a springboard to get into more advanced books that I've found online.