fact: Definition is_model_category {C : category} (W K F : morphism_class C) := is_weak_equivalences W × is_wfs K (F ∩ W) × is_wfs (K ∩ W) F.
imports: UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Prelude UniMath.ModelCategories.Lifting UniMath.ModelCategories.Retract UniMath.ModelCategories.MorphismClass UniMath.ModelCategories.WFS UniMath.ModelCategories.WeakEquivalences