Functions with arbitrary codomains are not vectors, but when your codomain is some field, they are.
This is what the article is very explicitly about. I guess you can quibble that the title is imprecise, but it's just a title and the article makes it clear.
This is what the article is very explicitly about. I guess you can quibble that the title is imprecise, but it's just a title and the article makes it clear.