fact: Definition make_is_invertible_2cell {C : prebicat_data} {a b : C} {f g : a --> b} {η : f ==> g} {φ : g ==> f} (ηφ : η • φ = id2 f) (φη : φ • η = id2 g) : is_invertible_2cell η := φ,, make_dirprod ηφ φη.
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