fact: Definition ooextendable_equiv {A B : Type} (C : B -> Type) (f : A -> B) `{IsEquiv _ _ f} : ooExtendableAlong f C := fun n => extendable_equiv n C f.
imports: HoTT.Basics HoTT.Types Equiv.PathSplit PathAny Cubical.DPath Cubical.DPathSquare Colimits.Coeq Colimits.MappingCylinder