fact: Definition rassociator_fun' {a b c d : C} (x : (C⟦a,b⟧ × C⟦b,c⟧) × C⟦c,d⟧) : (pr11 x · pr21 x) · pr2 x ==> pr11 x · (pr21 x · pr2 x) := rassociator (pr11 x) (pr21 x) (pr2 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