The text — now in version .91 in GitHub — is called Vapaa Matikka. The title translates as “Free Math,” but since matikka can also mean “burbot,” the book’s title also reads as “free fish” and its slogan — Matikka verkosta vapauteen — could be either a rallying cry to keep educational resources free and open or an instruction to free a fish from a net.
But I was interested in more than math puns. I wanted to find out how the book sprint had gone, what the team was planning to do with the textbook, and what advice he had for others organizing similar events. This interview was conducted by email between October 2 and 5.