Lemma I_func_I (a : C) : I (I_func a). Proof. apply (pr2 (pr1 (I_contr a))). Defined.
Require Import UniMath.Folds.UnicodeNotations. Require Import UniMath.Foundations.PartD. Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets.