If : X ? Y is any function, : ? :f ? f is a homomorphism. ring1) prove that if (f)=0 then f=0.2)

If : X ? Y is any function, : ? :f ? f • ô is a homomorphism. ring1) prove that if (f)=0 then f=0.2) show that if p is injective then p* is surjective?