fact: Definition isaset_disp_mor {D : twosided_disp_cat} {x₁ x₂ : C₁} {y₁ y₂ : C₂} (xy₁ : D x₁ y₁) (xy₂ : D x₂ y₂) (f : x₁ --> x₂) (g : y₁ --> y₂) : isaset (xy₁ -->[ f ][ g ] xy₂).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.DisplayedCats.Core UniMath.CategoryTheory.PrecategoryBinProduct