One of the more remarkable online resources to emerge in recent years is Library Genesis, a.k.a. LibGen, which Wikipedia describes as “a file-sharing based shadow library website for scholarly journal articles, academic and general-interest books, images, comics, audiobooks, and magazines.” The reason LibGen is relevant for the purposes of a math learning project is that it includes an enormous collection of math ebooks. As a result, I believe taking the existence of Library Genesis into account...