How to show is function surjective?
124808
How to find inverse of function?
117793
Finding a function $\mathbb{N} \to \mathbb{N}$ that is surjective but not injective.
72251
$g\circ f$ is Surjective and $g$ is Injective then Prove that $f$ is surjective
113109
Showing that a map is bijective and finding its inverse
52348
Counting the number of surjections.
90566
There exists surjections from A onto B and vice versa, and there is no bijection between the sets?
33196
show that A(T) is a group under operation of composition of functions
145573
How to show that $f$ is a zero function?
40566
Counting surjective functions
16610
Surjectivity of a map from a space to itself
5635
How to prove that the Frobenius endomorphism is surjective?
45991
Why $f\colon \mathbb{Z}_n^\times \to \mathbb{Z}_m^\times$ is surjective?
84114
Does there exist a surjective homomorphism from $(\mathbb R,+)$ to $(\mathbb Q,+)$ ?
53168
Surjective, Injective, Bijective Functions from $\mathbb Z$ to itself
45710
Finishing a proof: $f$ is injective if and only if it has a left inverse
152841
I want to show that $f(x)=x.f(1)$ where $f:R\to R$ is additive.
70912
If $g\circ f$ is injective and $f$ is surjective then $g$ is injective