Dear All,

The following is my question:

A function f:{1,2,3,4,} -> {0,1,2,3} is defined by the rule: f(n)=(n+6) mod 4

a. Draw an arrow diagram for this function.

I know how to do it but I do not know how to draw it in here.

b. Is f one-to-one?

Yes, it is.

c. Is f onto?

Yes, it is.

d. Does f^-1 exist? Explain your answer.

I have a problem in this part. Please explain the answer to me.

Cheers,