fact: Definition is_split_idempotent {c : C} (e : c --> c) : UU := ∑ c' (H : retraction c' c), e = retraction_retraction H · retraction_section H.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors