In which categories are epimorphisms equivalent to surjections?
132137
Concrete Categories Where Epis are Just Surjections
54333
In categorical terms, why is there no canonical isomorphism from a finite dimensional vector space to its dual?
130363
Prove composition of two surjections is surjection
145077
A continuous bijection $f:\mathbb{R}\to \mathbb{R}$ is an homeomorphism?
155266
Is $\exp:\overline{\mathbb{M}}_n\to\mathbb{M}_n$ injective?
10679
Equivalence of Categories and of Their Functor Categories
110885
Does there exists a continuous surjection from $\mathbb{R}$ to $\mathbb{R}^2$?
16610
Surjectivity of a map from a space to itself
61616
category of linear maps
16092
How to prove that the composition of two surjective functions is surjective
148616
When is a ring homomorphism $A \to A$ surjective but not injective.
118354
Epimorphism and Monomorphism = Isomorphism?
133083
Injectivity and surjectivity of a recursive function
127826
Is the geometric realization of a pointed category contractible?
73526
The equivalence of "Every surjection has a right inverse" and the Axiom of Choice
104757
If $f \circ g$ is surjective, then f is surjective
65034
Are continuous self-bijections of connected spaces homeomorphisms?