fact: Definition get_und_ver_left_unit (C: predoublecategory_hor_sq) : ∏ (c d : und_ver_cat_precategory_data C) (f: get_und_ver_cat_ob_mor c d), (make_und_ver_cat_comp (und_ver_cat_id C c) f) = f := fun c d f => und_ver_left_unit f.
imports: UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Notations UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Univalence