Question

Give an example of a relation that is NOT a function and explain why it is not a function.

Answer 1

let the relation R = {(0,1), (0, 2), (1, 3), (2,4), (3,5)} where we are mapping a set of integers to another set of integers.

The following is not a relation because one of the x values, 0, maps to TWO different y values, (0 maps to 1 AND 0 maps to 2), which is not allowed in a function