This is a draft which is being updated often, the latest version will be linked from here: <a href="http://www.mit.edu/~evanchen/napkin.html" rel="nofollow">http://www.mit.edu/~evanchen/napkin.html</a><p>That site also contains a description of what this book is and why it exists.<p>(I know this because I saw it linked from <a href="https://news.ycombinator.com/item?id=12429349" rel="nofollow">https://news.ycombinator.com/item?id=12429349</a> "learn advanced math without going to university" thread the other day)