proposition: Lemma vassoc4 {a b : C} {f g h i j: C ⟦a, b⟧} (w : f ==> g) (x : g ==> h) (y : h ==> i) (z : i ==> j) : w • (x • (y • z)) = w • (x • y) • z.
proof: Proof. repeat rewrite vassocr. apply idpath. Qed.
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