fact: Definition skewmonoidal_triangle_eq (V : skewmonoidal_category) : ∏ (a b : V), ρ' a #⊗ id b · α' a I b · id a #⊗ λ' b = id (a ⊗ b) := pr1 (pr2 eq).
imports: UniMath.Foundations.PartD UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.ProductCategory UniMath.CategoryTheory.PrecategoryBinProduct UniMath.CategoryTheory.whiskering