https://unimath.github.io/agda-unimath/foundation.dependent-epimorphisms.html
Dependent epimorphisms - agda-unimath
A community-driven library of formalized mathematics from a univalent point of view using the dependently typed programming language Agda.
dependentepimorphismsagda
https://numdam.org/item/CM_1994__91_3_321_0/
Localization of epimorphisms and monomorphisms in homotopy theory
homotopy theorylocalizationepimorphismsmonomorphisms