Question

Quick Question: what does f : R → R mean?

Answer 1

A function that maps from the real numbers to the real numbers.
The domain is all real numbers, and the codomain is also the real numbers.

Answer 2

What is a Codomain?

Answer 3

um its what the domain maps the range from. Think of the function f:R->R, f(x)=1/x
This is a function that maps from R to R but its range is R-{0}

Answer 4

Ok, Thanks to both of you. I understand it now.

Answer 5

My pleasure! =D