fact: Definition id2_invertible_2cell {C : prebicat} {a b : C} (f : a --> b) : invertible_2cell f f := make_invertible_2cell (is_invertible_2cell_id₂ f).
imports: UniMath.Tactics.EnsureStructuredProofs UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.PrecategoryBinProduct