if i'm quickly reading through a paper, i love using qiqqa, but for whole textbooks i often flip through pages (as chapters may reference previous chapters) and use the information as a different type of reference material. For example, when referencing a conference or journal paper, i'm much more concerned with an overview of their method and experimentation - where with a textbook i usually really read most of the formulas to try to understand the process.
What it boils down to is that ebooks are difficult to flip through, there's usually two types of page numbers - the page of the entire book and the page number within the book, and they are often not equal - making finding a specific passage or chapter more difficult than it should be.
What it boils down to is that ebooks are difficult to flip through, there's usually two types of page numbers - the page of the entire book and the page number within the book, and they are often not equal - making finding a specific passage or chapter more difficult than it should be.