Definition
map_map: forall {A B C : Type} (f : A -> B) (g : B -> C) (l : list A),
       map g (map f l) = map (fun x : A => g (f x)) l :=
fun (A B C : Type) (f : A -> B) (g : B -> C) (l : list A) =>
list_ind
  (fun l0 : list A => map g (map f l0) = map (fun x : A => g (f x)) l0)
  eq_refl
  (fun (a : A) (l0 : list A)
     (IHl : map g (map f l0) = map (fun x : A => g (f x)) l0) =>
   eq_ind_r
     (fun l1 : list C =>
      g (f a) :: l1 = g (f a) :: map (fun x : A => g (f x)) l0) eq_refl IHl)
  l.(******************************************

Definition of reptype.

******************************************)

Notation sigTT P := (fun tv => match tv with existT t v => P t end).Definition compact_prod_sigT_type {A} {P: A -> Type} (l: list (sigT P)): Type :=
  compact_prod (map (sigTT P) l).Definition compact_prod_sigT_value: forall {A} {P: A -> Type} (l: list (sigT P)), compact_prod (map (sigTT P) l).Definition compact_sum_sigT_type {A} {P: A -> Type} (l: list (sigT P)): Type :=
  compact_sum (map (sigTT P) l).Definition compact_sum_sigT_value: forall {A} {P: A -> Type} (l: list (sigT P)), compact_sum (map (sigTT P) l).Definition compact_prod_map {X: Type} {F F0: X -> Type} (l: list X)
  (f: ListType (map (fun x => F x -> F0 x) l)): compact_prod (map F l) -> compact_prod (map F0 l).

Lemma compact_prod_map_nil: forall {X: Type} {F F0: X -> Type}, @compact_prod_map X F F0 nil Nil tt = tt.