@richard_merren @ploum I always liked it when the professor wrote the book, they seemed like they were way more likely to photocopy and hand it out for free. One even said he made more than enough money selling it to poor students at other universities.

@richard_merren @ploum I had a professor who not only assigned his own book, and not only released a new edition every year with the problem numbers changed, but also gave extra credit on the final exam if you tore the front cover off of the book and turned it in with the test.