I've never really browsed the mathematics area of these types of books. I do recall a story of high school teachers developing their own text making news in the

I've never really browsed the mathematics area of these types of books. I do recall a story of high school teachers developing their own text making news in the past 5-7 years or so. While I don't really have time to at the moment, you'll find the best wikibooks / gitbooks.io are probably on programming. Or topics where less diagram content is involved or required. Also when it's an open source book anybody can extrapolate the content and reformat it in design software suc as indesign, scribus or whatever. The framework and methods exist, but there are gaps in the process that have made it so a professor is gonna make their own book and bind it through the campus copy shop. But we know the divide, we know a way to make it work, just need people to jump in I guess and have a reason to do it well for less cost. It will take a couple entrepreneurial people, but it would make for an attention-getting enterprise. hacker news might breed the right kind of people for this.