# Is the relation {(0, 3), (0, -2), (0, 1)} a function?

May 28, 2015

To be a function, a single value in the Domain can not map into multiple values in the Range.

In the given set:
the Domain is $\left\{0\right\}$ and
the Range is $\left\{3 , 2 , 1\right\}$

This is not a function.