fact: Definition get_id_hor_left (C : predoublecategory_hor) : ∏ (a b : C) (f : a -h-> b), hor_identity a ·h f = f := pr112 C.
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