what is the term used to describe a function inside a function ?

Question

BUSTECH

Answer 1

Do you mean nested? Or maybe recursive? The term "recursive" is only applied when a function calls itself, which is a special case of what you describe. I suppose in the general case, I might use the term nested, but since functions call functions all the time, it almost seems silly to give this a name.

Answer 2

In Calculus it is termed a composition function.

Answer 3

compostion of functions =)

Answer 4

sub-function !