fact: Definition extendable_homotopic (n : nat) {A B : Type} (C : B -> Type) (f : A -> B) {g : A -> B} (p : f == g) : ExtendableAlong n f C -> ExtendableAlong n g C.
imports: HoTT.Basics HoTT.Types Equiv.PathSplit PathAny Cubical.DPath Cubical.DPathSquare Colimits.Coeq Colimits.MappingCylinder