Sec. 7, 9.1-9.2, Due February 24

Defining a function as the book has doesn't seem to different from what I've learned in previous math classes.  The main difference is simply in the notation (or so it currently appears).  The sections introduced a lot of new vocabulary concerning functions.  Things such as "mapping"  and "image".  The set B is referred to as the codomain as well as the range of a function.  Are they interchangeable?