fact: Definition lp {x y a b : C} (f : x --> y) (g : a --> b) : hProp := ∀ (h : x --> a) (k : y --> b) (H : h · g = f · k), ∥filler H∥.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.CategoryTheory.opp_precat UniMath.CategoryTheory.Limits.Opp UniMath.ModelCategories.Retract UniMath.ModelCategories.MorphismClass UniMath.CategoryTheory.DisplayedCats.Examples.Arrow