fact: Definition hsubtype_mors_isEpi : ∏ (a b : C), hsubtype (C⟦a, b⟧) := (λ a b : C, (fun f : C⟦a, b⟧ => make_hProp _ (isapropisEpi C C f))).
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.Subcategory.Core UniMath.CategoryTheory.Core.Functors