Section Properties.
Implicit Types x y : TVar.
Implicit Types xs ys : list TVar.
(* ---------------------------------------------------------------------- *)
(** **** Abstract properties of ok *)
(* ---------------------------------------------------------------------- *)
(** **** Properties of binds *)

(** Binds and map. *)
Theorem binds_map : forall A B x (v : A) (E : gen_env A) (f : A -> B),
x ∹ v ⋲ E ->
x ∹ (f v) ⋲ (map f E).