proposition: Lemma folds_iso_from_iso_iso_from_folds_iso : folds_iso_from_iso _ _ (iso_from_folds_iso _ _ i') = i'.
proof: Proof. apply folds_iso_equal. apply (@id_left C'). Qed.
imports: UniMath.Folds.UnicodeNotations UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.Foundations.UnivalenceAxiom UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.Folds.folds_precat UniMath.Folds.from_precats_to_folds_and_back