Below are tables for two functions, [math] and [math] The function [math] is invertible, but the function [math] is non-invertible.
Invertible function [math]
Non-invertible function [math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
[math]
In the last problem, you decided why a certain table was non-invertible.
In general, a function is non-invertible if:
In general, a function is invertible if:

Hint:

Solution: