[ivansavz]

> that there is a need for the liberal use of swearing in a mathematics book

You are right that there is no //need//, but I find that a little swearing goes a long way to make the student who is scared of the subject feel more comfortable. "This is not a math book", they will think -- this is informal narrative like a blog post.

A cleaned up version is in the works. ETA March because I have to finish Linear Algebra and E&M first.