An Infinitely Large Napkin [pdf]

This is a draft which is being updated often, the latest version will be linked from here: http://www.mit.edu/~evanchen/napkin.html

That site also contains a description of what this book is and why it exists.

(I know this because I saw it linked from https://news.ycombinator.com/item?id=12429349 "learn advanced math without going to university" thread the other day)

I read the opening two pages but I'm not sure what this really is. A higher math text book? It looks great though!...