Epimorphisms of magmas: are they surjective?
115409
Are MAGMA-epimorphisms sujective?
88857
Prove that Gauss map on M is surjective
158892
Surjective endomorphism of abelian group is isomorphism
13761
Automorphisms in $\mathbb{Z}_n$
63731
Can we characterize the Möbius transformations that maps the unit disk into itself?
98436
Finite order endomorphisms
78950
Does this map extend to a unique automorphism of the polynomial ring of an integral domain?
62454
Let $f : G → G_1$ be a surjective homomorphism (also called epimorphism) from $G$ to another group $G_1$. Prove that $f(Z(G)) \subseteq Z(G_1)$.
111239
Are monomorphisms of rings injective?
97608
Showing a Ring of endomorphisms is isomorphic to a Ring
143043
When is a local homeomorphism a covering map?
11813
Injective functions also surjective?
145077
A continuous bijection $f:\mathbb{R}\to \mathbb{R}$ is an homeomorphism?
148187
Question regarding one-point compactification and homeomorphisms
129162
Show there is a surjective homomorphism from $\mathbb{Z}\ast\mathbb{Z}$ onto $C_2\ast C_3$
29453
An epimorphism from $S_{4}$ to $S_{3}$ having the kernel isomorphic to Klein four-group
111689
Surjective, but not injective endomorphism