Section sec_map_modalop.
Variable A B: Type.
Proof using.
unfold and_tl; intuition.
Qed.
Proof using.
unfold and_tl; intuition.
Qed.
Proof using.
unfold or_tl; intuition.
Qed.
Proof using.
unfold or_tl; intuition.
Qed.
Proof using.
unfold impl_tl; intuition.
Qed.
Proof using.
unfold impl_tl; intuition.
Qed.
Proof using.
unfold not_tl; intuition.
Qed.
Proof using.
unfold not_tl; intuition.
Qed.
Proof using.
intros f P (x, s) nP; assumption.
Qed.
Proof using.
intros f P (x, s) nP; assumption.
Qed.
Proof using.
intros f P Q PQ [x s]; apply PQ.
Qed.
Proof using.
intros f P Q QP [x s]; apply QP.
Qed.
Proof using.
intros f P (x, (y, s)) nP; assumption.
Qed.
Proof using.
intros f P (x, (y, s)) nP; assumption.
Qed.
Proof using.
intros f P Q PQ. cofix cf.
intros (x, s) a. case (always_Cons a); intros a1 a2. constructor.
- apply PQ. assumption.
- rewrite map_Cons; simpl. apply cf; assumption.
Qed.
Proof using.
intros f J P Q inv JQP. cofix c.
intros [x s] Js a.
rewrite map_Cons in a. case (always_Cons a); intros a1 a2. constructor.
- apply JQP. assumption.
rewrite map_Cons; assumption.
- simpl. apply c.
* apply (inv x). assumption.
* assumption.
Qed.
Proof using.
intros f P Q QP s.
apply (always_map_conv_ext f P Q True_tl); auto.
Qed.
Proof using.
intros f J P K Q JK PQ. cofix cf.
intros (x, s) un. case (weak_until_Cons un); clear un.
- intro Pxs; constructor 1. apply PQ. assumption.
- intros (Jxs, un). rewrite map_Cons. constructor 2.
* rewrite <- map_Cons. auto.
* simpl. auto.
Qed.
Proof using.
intros f J P K Q KJ QP. cofix cf.
intros (x, s) un.
rewrite map_Cons in un; case (weak_until_Cons un); clear un; rewrite <- map_Cons.
- intro Qxs; constructor 1. apply QP. assumption.
- intros (Kxs, un). constructor 2; simpl; auto.
Qed.
Proof using.
intros f J P K Q JK PQ s un.
induction un.
- apply U0, PQ. assumption.
- rewrite map_Cons.
apply U_next.
* rewrite <- map_Cons.
apply JK.
assumption.
* assumption.
Qed.
Proof using.
intros f J P K Q JK PQ. cofix cf.
intros (x, s) rl. case (release_Cons rl); clear rl.
intros Pxs orR.
case orR; intro cR.
- apply R0.
* apply PQ. assumption.
* apply JK. assumption.
- apply R_tl.
* apply PQ. assumption.
* apply cf. assumption.
Qed.
Proof using.
intros f J P K Q KJ QP. cofix cf.
intros (x, s) rl.
rewrite map_Cons in rl; case (release_Cons rl); clear rl; rewrite <- map_Cons; intros QC orR; case orR; intro cR.
- apply R0.
* apply QP. assumption.
* apply KJ. assumption.
- apply R_tl.
* apply QP. assumption.
* apply cf. assumption.
Qed.
Proof using.
intros f P Q PQ s e. induction e as [s ok | x s e induc_hyp].
- destruct s as (x, s); simpl in *. rewrite map_Cons. constructor 1.
rewrite <- map_Cons. apply PQ. exact ok.
- rewrite map_Cons. constructor 2. exact induc_hyp.
Qed.
(* The converse seems to require much more work *)
Definition fstAB := fst (A:=A) (B:=B).
Proof using.
cofix cf. intros (a, sA) (b, sB).
rewrite zip_Cons. rewrite map_Cons. constructor. apply cf.
Qed.

Lemma exteq_zip_map :
forall (f: A->B) (sA: infseq A) (sB: infseq B),
always (now (fun c: A*B => let (x, y) := c in y = f x)) (zip sA sB) ->
exteq sB (map f (map fstAB (zip sA (map f sA)))).