fact: Definition inv_cell {C : prebicat_data} {a b : C} {f g : a --> b} {η : f ==> g} : is_invertible_2cell η → g ==> f := pr1.
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