fact: Definition extendable_over_const (n : nat) {A B : Type} (C : B -> Type) (f : A -> B) (ext : ExtendableAlong n f C) (D : B -> Type) : ExtendableAlong n f D -> ExtendableAlong_Over n f C (fun b _ => D b) ext.
imports: HoTT.Basics HoTT.Types Extensions ReflectiveSubuniverse Accessible