I didn't read every word and take notes. I have little academic experience, limited math knowledge, but I have a lot of experience trading options. As a result, much of the derivation, while somewhat difficult, was intuitive to me. I like this book and recommend it with few caveats. You can see that I took two months to read it. I read seven other books at the same time so it was not that the book was formidable but rather it is neither difficult "to put down and pick back up" nor is it necessary to digest quickly. I would like to read this again. We shall see about that!