Definition split_idempotent_is_split {c : C} (e : split_idempotent c) : split_idempotent_morphism e = split_idempotent_retraction e · retraction_section (split_idempotent_retraction e) := pr222 e.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Functors. Require Import UniMath.CategoryTheory.OppositeCategory.Core.