The image of a set
Let f be a function from the set A to the set B, and let S be a subset
of A. The image of S, denoted by f(S), is the subset of B that consists
of the images of the elements of S:
Let f: Z ? Z be defined as f(x) = x+1. Let S be the set of even
integers. What is the image of S?
--- The set of odd integers.