fact: Definition left_unitor_trans {C : prebicategory_data} (a b : C) : bindelta_pair_functor (constant_functor (a -1-> b) (a -1-> a) (identity1 a)) (functor_identity (a -1-> b)) ∙ compose_functor a a b ⟹ functor_identity (a -1-> b) := pr1 (pr2 (pr2 C)) a b.
imports: UniMath.Foundations.PartD UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.PrecategoryBinProduct UniMath.CategoryTheory.Categories.StandardCategories UniMath.CategoryTheory.HorizontalComposition UniMath.CategoryTheory.Equivalences.Core