X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fcoq-contribs%2FLAMBDA-TYPES%2Fpc3_props.v;h=28aa031507847ed705a456f7f2549eb78c52fc78;hb=97c2d258a5c524eb5c4b85208899d80751a2c82f;hp=49d9bc4ecff08729ce4d5bddade8eab2cff853ab;hpb=1b21075e987872a2e3103203b4e67c939e4a9f6a;p=helm.git

diff --git a/helm/coq-contribs/LAMBDA-TYPES/pc3_props.v b/helm/coq-contribs/LAMBDA-TYPES/pc3_props.v
index 49d9bc4ec..28aa03150 100644
--- a/helm/coq-contribs/LAMBDA-TYPES/pc3_props.v
+++ b/helm/coq-contribs/LAMBDA-TYPES/pc3_props.v
@@ -2,88 +2,109 @@
 
 Require subst0_subst0.
 Require pr0_subst0.
+Require cpr0_defs.
 Require pr3_defs.
 Require pr3_props.
 Require pr3_confluence.
-Require cpr0_defs.
-Require cpr0_props.
 Require pc3_defs.
 
-   Section pc3_confluence. (*************************************************)
+   Section pc3_trans. (******************************************************)
 
-      Theorem pc3_confluence : (c:?; t1,t2:?) (pc3 c t1 t2) ->
-                               (EX t0 | (pr3 c t1 t0) & (pr3 c t2 t0)).
-      Intros; XElim H; Intros.
-(* case 1 : pc3_r *)
-      XEAuto.
-(* case 2 : pc3_u *)
-      Clear H0; XElim H1; Intros.
-      Inversion_clear H; [ XEAuto | Pr3Confluence; XEAuto ].
+      Theorem pc3_t: (t2,c,t1:?) (pc3 c t1 t2) ->
+                     (t3:?) (pc3 c t2 t3) -> (pc3 c t1 t3).
+      Intros; Repeat Pc3Unfold; Pr3Confluence; XEAuto.
       Qed.
 
-   End pc3_confluence.
+      Theorem pc3_pr2_u2: (c:?; t0,t1:?) (pr2 c t0 t1) ->
+                          (t2:?) (pc3 c t0 t2) -> (pc3 c t1 t2).
+      Intros; Apply (pc3_t t0); XAuto.
+      Qed.
 
-      Tactic Definition Pc3Confluence :=
+      Theorem pc3_tail_12: (c:?; u1,u2:?) (pc3 c u1 u2) ->
+                           (k:?; t1,t2:?) (pc3 (CTail c k u2) t1 t2) ->
+                           (pc3 c (TTail k u1 t1) (TTail k u2 t2)).
+      Intros.
+      EApply pc3_t; [ Apply pc3_tail_1 | Apply pc3_tail_2 ]; XAuto.
+      Qed.
+
+      Theorem pc3_tail_21: (c:?; u1,u2:?) (pc3 c u1 u2) ->
+                           (k:?; t1,t2:?) (pc3 (CTail c k u1) t1 t2) ->
+                           (pc3 c (TTail k u1 t1) (TTail k u2 t2)).
+      Intros.
+      EApply pc3_t; [ Apply pc3_tail_2 | Apply pc3_tail_1 ]; XAuto.
+      Qed.
+
+   End pc3_trans.
+
+      Hints Resolve pc3_t pc3_tail_12 pc3_tail_21 : ltlc.
+
+      Tactic Definition Pc3T :=
          Match Context With
-            [ H: (pc3 ?1 ?2 ?3) |- ? ] ->
-               LApply (pc3_confluence ?1 ?2 ?3); [ Clear H; Intros H | XAuto ];
-               XElim H; Intros.
+            | [ _: (pr3 ?1 ?2 (TTail ?3 ?4 ?5)); _: (pc3 ?1 ?6 ?4) |- ? ] ->
+               LApply (pc3_t (TTail ?3 ?4 ?5) ?1 ?2); [ Intros H_x | XAuto ];
+               LApply (H_x (TTail ?3 ?6 ?5)); [ Clear H_x; Intros | Apply pc3_s; XAuto ]
+            | [ _: (pc3 ?1 ?2 ?3); _: (pr3 ?1 ?3 ?4) |- ? ] ->
+               LApply (pc3_t ?3 ?1 ?2); [ Intros H_x | XAuto ];
+               LApply (H_x ?4); [ Clear H_x; Intros | XAuto ]
+            | [ _: (pc3 ?1 ?2 ?3); _: (pc3 ?1 ?4 ?3) |- ? ] ->
+               LApply (pc3_t ?3 ?1 ?2); [ Intros H_x | XAuto ];
+               LApply (H_x ?4); [ Clear H_x; Intros | XAuto ].
 
    Section pc3_context. (****************************************************)
 
-      Theorem pc3_pr0_pr2_t : (u1,u2:?) (pr0 u2 u1) ->
-                              (c:?; t1,t2:?; k:?) (pr2 (CTail c k u2) t1 t2) ->
-                              (pc3 (CTail c k u1) t1 t2).
+      Theorem pc3_pr0_pr2_t: (u1,u2:?) (pr0 u2 u1) ->
+                             (c:?; t1,t2:?; k:?) (pr2 (CTail c k u2) t1 t2) ->
+                             (pc3 (CTail c k u1) t1 t2).
       Intros.
       Inversion H0; Clear H0; [ XAuto | NewInduction i ].
-(* case 1 : pr2_delta i = 0 *)
-      DropGenBase; Inversion H0; Clear H0 H3 H4 c k.
-      Rewrite H5 in H; Clear H5 u2.
-      Pr0Subst0; XEAuto.
-(* case 2 : pr2_delta i > 0 *)
+(* case 1: pr2_delta i = 0 *)
+      DropGenBase; Inversion H0; Clear H0 H4 H5 H6 c k t.
+      Rewrite H7 in H; Clear H7 u2.
+      Pr0Subst0; Apply pc3_pr3_t with t0:=x; XEAuto.
+(* case 2: pr2_delta i > 0 *)
       NewInduction k; DropGenBase; XEAuto.
       Qed.
 
-      Theorem pc3_pr2_pr2_t : (c:?; u1,u2:?) (pr2 c u2 u1) ->
-                              (t1,t2:?; k:?) (pr2 (CTail c k u2) t1 t2) ->
-                              (pc3 (CTail c k u1) t1 t2).
+      Theorem pc3_pr2_pr2_t: (c:?; u1,u2:?) (pr2 c u2 u1) ->
+                             (t1,t2:?; k:?) (pr2 (CTail c k u2) t1 t2) ->
+                             (pc3 (CTail c k u1) t1 t2).
       Intros until 1; Inversion H; Clear H; Intros.
-(* case 1 : pr2_pr0 *)
+(* case 1: pr2_free *)
       EApply pc3_pr0_pr2_t; [ Apply H0 | XAuto ].
-(* case 2 : pr2_delta *)
+(* case 2: pr2_delta *)
       Inversion H; [ XAuto | NewInduction i0 ].
-(* case 2.1 : i0 = 0 *)
-      DropGenBase; Inversion H2; Clear H2.
-      Rewrite <- H5; Rewrite H6 in H; Rewrite <- H7 in H3; Clear H5 H6 H7 d0 k u0.
-      Subst0Subst0; Arith9'In H4 i.
-      EApply pc3_pr3_u.
+(* case 2.1: i0 = 0 *)
+      DropGenBase; Inversion H4; Clear H3 H4 H7 t t4.
+      Rewrite <- H9; Rewrite H10 in H; Rewrite <- H11 in H6; Clear H9 H10 H11 d0 k u0.
+      Pr0Subst0; Subst0Subst0; Arith9'In H6 i.
+      EApply pc3_pr2_u.
       EApply pr2_delta; XEAuto.
-      Apply pc3_pr2_x; EApply pr2_delta; [ Idtac | XEAuto ]; XEAuto.
-(* case 2.2 : i0 > 0 *)
+      Apply pc3_pr2_x; EApply pr2_delta; [ Idtac | XEAuto | XEAuto ]; XEAuto.
+(* case 2.2: i0 > 0 *)
       Clear IHi0; NewInduction k; DropGenBase; XEAuto.
       Qed.
 
-      Theorem pc3_pr2_pr3_t : (c:?; u2,t1,t2:?; k:?)
-                              (pr3 (CTail c k u2) t1 t2) ->
-                              (u1:?) (pr2 c u2 u1) ->
-                              (pc3 (CTail c k u1) t1 t2).
+      Theorem pc3_pr2_pr3_t: (c:?; u2,t1,t2:?; k:?)
+                             (pr3 (CTail c k u2) t1 t2) ->
+                             (u1:?) (pr2 c u2 u1) ->
+                             (pc3 (CTail c k u1) t1 t2).
       Intros until 1; XElim H; Intros.
-(* case 1 : pr3_r *)
+(* case 1: pr3_refl *)
       XAuto.
-(* case 2 : pr3_u *)
+(* case 2: pr3_sing *)
       EApply pc3_t.
       EApply pc3_pr2_pr2_t; [ Apply H2 | Apply H ].
       XAuto.
       Qed.
 
-      Theorem pc3_pr3_pc3_t : (c:?; u1,u2:?) (pr3 c u2 u1) ->
-                              (t1,t2:?; k:?) (pc3 (CTail c k u2) t1 t2) ->
-                              (pc3 (CTail c k u1) t1 t2).
+      Theorem pc3_pr3_pc3_t: (c:?; u1,u2:?) (pr3 c u2 u1) ->
+                             (t1,t2:?; k:?) (pc3 (CTail c k u2) t1 t2) ->
+                             (pc3 (CTail c k u1) t1 t2).
       Intros until 1; XElim H; Intros.
-(* case 1 : pr3_r *)
+(* case 1: pr3_refl *)
       XAuto.
-(* case 2 : pr3_u *)
-      Apply H1; Pc3Confluence.
+(* case 2: pr3_sing *)
+      Apply H1; Pc3Unfold.
       EApply pc3_t; [ Idtac | Apply pc3_s ]; EApply pc3_pr2_pr3_t; XEAuto.
       Qed.
 
@@ -110,13 +131,13 @@ Require pc3_defs.
 
    Section pc3_lift. (*******************************************************)
 
-      Theorem pc3_lift : (c,e:?; h,d:?) (drop h d c e) ->
-                         (t1,t2:?) (pc3 e t1 t2) ->
-                         (pc3 c (lift h d t1) (lift h d t2)).
+      Theorem pc3_lift: (c,e:?; h,d:?) (drop h d c e) ->
+                        (t1,t2:?) (pc3 e t1 t2) ->
+                        (pc3 c (lift h d t1) (lift h d t2)).
 
       Intros.
-      Pc3Confluence.
-      EApply pc3_pr3_t; (EApply pr3_lift; [ XEAuto | Apply H0 Orelse Apply H1 ]).
+      Pc3Unfold.
+      EApply pc3_pr3_t; (EApply pr3_lift; [ XEAuto | Apply H1 Orelse Apply H2 ]).
       Qed.
 
    End pc3_lift.
@@ -125,39 +146,88 @@ Require pc3_defs.
 
    Section pc3_cpr0. (*******************************************************)
 
-      Remark pc3_cpr0_t_aux : (c1,c2:?) (cpr0 c1 c2) ->
-                              (k:?; u,t1,t2:?) (pr3 (CTail c1 k u) t1 t2) ->
-                              (pc3 (CTail c2 k u) t1 t2).
+      Remark pc3_cpr0_t_aux: (c1,c2:?) (cpr0 c1 c2) ->
+                             (k:?; u,t1,t2:?) (pr3 (CTail c1 k u) t1 t2) ->
+                             (pc3 (CTail c2 k u) t1 t2).
       Intros; XElim H0; Intros.
-(* case 1.1 : pr3_r *)
+(* case 1.1: pr3_refl *)
       XAuto.
-(* case 1.2 : pr3_u *)
+(* case 1.2: pr3_sing *)
       EApply pc3_t; [ Idtac | XEAuto ]. Clear H2 t1 t2.
       Inversion_clear H0.
-(* case 1.2.1 : pr2_pr0 *)
+(* case 1.2.1: pr2_free *)
       XAuto.
-(* case 1.2.2 : pr2_delta *)
+(* case 1.2.2: pr2_delta *)
       Cpr0Drop; Pr0Subst0.
-      EApply pc3_pr3_u; [ EApply pr2_delta; XEAuto | XAuto ].
+      EApply pc3_pr2_u; [ EApply pr2_delta; XEAuto | XAuto ].
       Qed.
 
-      Theorem pc3_cpr0_t : (c1,c2:?) (cpr0 c1 c2) ->
-                           (t1,t2:?) (pr3 c1 t1 t2) ->
-                           (pc3 c2 t1 t2).
+      Theorem pc3_cpr0_t: (c1,c2:?) (cpr0 c1 c2) ->
+                          (t1,t2:?) (pr3 c1 t1 t2) ->
+                          (pc3 c2 t1 t2).
       Intros until 1; XElim H; Intros.
-(* case 1 : cpr0_refl *)
+(* case 1: cpr0_refl *)
       XAuto.
-(* case 2 : cpr0_cont *)
-      Pc3Context; Pc3Confluence.
+(* case 2: cpr0_comp *)
+      Pc3Context; Pc3Unfold.
       EApply pc3_t; [ Idtac | Apply pc3_s ]; EApply pc3_cpr0_t_aux; XEAuto.
       Qed.
 
-      Theorem pc3_cpr0 : (c1,c2:?) (cpr0 c1 c2) -> (t1,t2:?) (pc3 c1 t1 t2) ->
-                         (pc3 c2 t1 t2).
-      Intros; Pc3Confluence.
+      Theorem pc3_cpr0: (c1,c2:?) (cpr0 c1 c2) -> (t1,t2:?) (pc3 c1 t1 t2) ->
+                        (pc3 c2 t1 t2).
+      Intros; Pc3Unfold.
       EApply pc3_t; [ Idtac | Apply pc3_s ]; EApply pc3_cpr0_t; XEAuto.
       Qed.
 
    End pc3_cpr0.
 
       Hints Resolve pc3_cpr0 : ltlc.
+
+   Section pc3_ind_left. (***************************************************)
+   
+      Inductive pc3_left [c:C] : T -> T -> Prop :=
+         | pc3_left_r : (t:?) (pc3_left c t t)
+	 | pc3_left_ur: (t1,t2:?) (pr2 c t1 t2) -> (t3:?) (pc3_left c t2 t3) ->
+	                (pc3_left c t1 t3)
+	 | pc3_left_ux: (t1,t2:?) (pr2 c t1 t2) -> (t3:?) (pc3_left c t1 t3) ->
+	                (pc3_left c t2 t3).
+			
+      Hint pc3_left: ltlc := Constructors pc3_left.
+
+      Remark pc3_left_pr3: (c:?; t1,t2:?) (pr3 c t1 t2) -> (pc3_left c t1 t2).
+      Intros; XElim H; XEAuto.
+      Qed.
+
+      Remark pc3_left_trans: (c:?; t1,t2:?) (pc3_left c t1 t2) -> 
+                             (t3:?) (pc3_left c t2 t3) -> (pc3_left c t1 t3).
+      Intros until 1; XElim H; XEAuto.
+      Qed.
+
+      Hints Resolve pc3_left_trans : ltlc.
+
+      Remark pc3_left_sym: (c:?; t1,t2:?) (pc3_left c t1 t2) -> 
+                           (pc3_left c t2 t1).
+      Intros; XElim H; XEAuto.
+      Qed.
+
+      Hints Resolve pc3_left_sym pc3_left_pr3 : ltlc.
+
+      Remark pc3_left_pc3: (c:?; t1,t2:?) (pc3 c t1 t2) -> (pc3_left c t1 t2).
+      Intros; Pc3Unfold; XEAuto.
+      Qed.
+
+      Remark pc3_pc3_left: (c:?; t1,t2:?) (pc3_left c t1 t2) -> (pc3 c t1 t2).
+      Intros; XElim H; XEAuto.
+      Qed.
+      
+      Hints Resolve pc3_left_pc3 pc3_pc3_left : ltlc.
+
+      Theorem pc3_ind_left: (c:C; P:(T->T->Prop))
+                            ((t:T) (P t t)) ->
+			    ((t1,t2:T) (pr2 c t1 t2) -> (t3:T) (pc3 c t2 t3) -> (P t2 t3) -> (P t1 t3)) ->
+			    ((t1,t2:T) (pr2 c t1 t2) -> (t3:T) (pc3 c t1 t3) -> (P t1 t3) -> (P t2 t3)) ->
+	                    (t,t0:T) (pc3 c t t0) -> (P t t0).
+      Intros; ElimType (pc3_left c t t0); XEAuto.
+      Qed.
+
+   End pc3_ind_left.