TITLE: Opposite of a function being bijective?
QUESTION [5 upvotes]: A function is bijective if it is both surjective and injective. Is there a term for when a function is both not surjective and not injective?

REPLY [5 votes]: As far as I know, there isn't.  The concept of a "non-surjective and non-injective function" just doesn't generally arise often enough to need a special term.