fact: Definition lwhisker {C : prebicat_data} {a b c : C} (f : C⟦a, b⟧) {g1 g2 : C⟦b, c⟧} : g1 ==> g2 → f · g1 ==> f · g2 := λ x, pr1 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 (pr2 C))))))))) _ _ _ _ _ _ x.
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