A function is a relation that has exactly one "output" for every "input".
Consider two sets A and B to form the Cartesian product. This Cartesian product forms the relations. Among these relations we select those relations that satisfy the condition - every element on A is related to only one element in set B.
Function: Any relation on A x B in which in which every element in set A has a corresponding element on set B.
Representation of a function
Directions: Solve the following problems. Also write at least 5 examples of your own.