I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$?
I know that every function is surjective when it's codomain is restricted to it's image but I am not sure can I do what I did.
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
No comments:
Post a Comment