(** [rev], [in], [map], [Forall], [Exists], etc. *)

Global Instance CPermutation_rev A :
  Proper (@CPermutation A ==> @CPermutation A) (@rev A) | 10.Global Instance CPermutation_in A a :
  Proper (@CPermutation A ==> Basics.impl) (In a).Global Instance CPermutation_in' A :
  Proper (Logic.eq ==> @CPermutation A ==> iff) (@In A) | 10.Global Instance CPermutation_map A B (f : A -> B) :
   Proper (@CPermutation A ==> @CPermutation B) (map f) | 10.

Lemma CPermutation_image A B : forall (f : A -> B) a l l', CPermutation (a :: l) (map f l') -> exists a', a = f a'.