Let $A=\{x^2:0
- There is a one to one, onto function from $A$ to $B$.
- There is no one to one, onto function from $A$ to $B$ taking rationals to rationals.
- There is no one to one function from $A$ to $B$ which is onto.
- There is no onto function from $A$ to $B$ which is one to one.
I have been trying to solve the problem. Could someone point me in the right direction? Thanks in advance for your time.