fact: Definition is_invertible_2cell {C : prebicat_data} {a b : C} {f g : a --> b} (η : f ==> g) : UU := ∑ φ : g ==> f, η • φ = id2 f × φ • η = id2 g.
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