proposition: Proposition linvunitor_lunitor_h' {C : double_cat} {x y : C} (f : x -->h y) : transportf_square (id_v_left _) (id_v_left _) (linvunitor_h f ⋆v lunitor_h f) = id_v_square _.
proof: Proof. rewrite linvunitor_lunitor_h. rewrite transportfb_square. apply idpath. Qed.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence UniMath.Bicategories.Core.Bicat UniMath.Bicategories.DoubleCategories.Core.DoubleCats UniMath.Bicategories.DoubleCategories.DerivedLaws.TransportLaws UniMath.Bicategories.DoubleCategories.Core.DoubleCats UniMath.Bicategories.DoubleCategories.Core.UnivalentDoubleCats