Saturday, February 28, 2009
Let A and B be sets. f is said to be a function from set A to set B if and only if for each element x of A there is associated a uniquely determined element f(x) of B. The set A is called the domain of f and the elements f(x) are called the values of f. The set of all values of f is called the range of f.
Notation: f : A --> B and read as f is a function from A to B
-From Real Analysis's lecture notes-
(This is one-one relation. So, it's a function.)
(This is many-to-one relation. So, is a function too!)