X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambda_delta%2Fbasic_2%2Funfold%2Fltpss.ma;h=dfd1a19f6bb1271d27e01e3c84378571ba10f1a0;hb=039f4f6db3a3c128959cd471eb78f575906e07b6;hp=6b44d74f6414ff92dede82721cc415d6a9438b84;hpb=fc5a0d62ece398d8547dda0f429b9f1e24bca306;p=helm.git

diff --git a/matita/matita/contribs/lambda_delta/basic_2/unfold/ltpss.ma b/matita/matita/contribs/lambda_delta/basic_2/unfold/ltpss.ma
index 6b44d74f6..dfd1a19f6 100644
--- a/matita/matita/contribs/lambda_delta/basic_2/unfold/ltpss.ma
+++ b/matita/matita/contribs/lambda_delta/basic_2/unfold/ltpss.ma
@@ -21,92 +21,19 @@ inductive ltpss: nat → nat → relation lenv ≝
 | ltpss_atom : ∀d,e. ltpss d e (⋆) (⋆)
 | ltpss_pair : ∀L,I,V. ltpss 0 0 (L. ⓑ{I} V) (L. ⓑ{I} V)
 | ltpss_tpss2: ∀L1,L2,I,V1,V2,e.
-               ltpss 0 e L1 L2 → L2 ⊢ V1 [0, e] ▶* V2 →
+               ltpss 0 e L1 L2 → L2 ⊢ V1 ▶* [0, e] V2 →
                ltpss 0 (e + 1) (L1. ⓑ{I} V1) (L2. ⓑ{I} V2)
 | ltpss_tpss1: ∀L1,L2,I,V1,V2,d,e.
-               ltpss d e L1 L2 → L2 ⊢ V1 [d, e] ▶* V2 →
+               ltpss d e L1 L2 → L2 ⊢ V1 ▶* [d, e] V2 →
                ltpss (d + 1) e (L1. ⓑ{I} V1) (L2. ⓑ{I} V2)
 .
 
 interpretation "parallel unfold (local environment)"
    'PSubstStar L1 d e L2 = (ltpss d e L1 L2).
 
-(* Basic properties *********************************************************)
-
-lemma ltpss_tps2: ∀L1,L2,I,V1,V2,e.
-                  L1 [0, e] ▶* L2 → L2 ⊢ V1 [0, e] ▶ V2 →
-                  L1. ⓑ{I} V1 [0, e + 1] ▶* L2. ⓑ{I} V2.
-/3 width=1/ qed.
-
-lemma ltpss_tps1: ∀L1,L2,I,V1,V2,d,e.
-                  L1 [d, e] ▶* L2 → L2 ⊢ V1 [d, e] ▶ V2 →
-                  L1. ⓑ{I} V1 [d + 1, e] ▶* L2. ⓑ{I} V2.
-/3 width=1/ qed.
-
-lemma ltpss_tpss2_lt: ∀L1,L2,I,V1,V2,e.
-                      L1 [0, e - 1] ▶* L2 → L2 ⊢ V1 [0, e - 1] ▶* V2 →
-                      0 < e → L1. ⓑ{I} V1 [0, e] ▶* L2. ⓑ{I} V2.
-#L1 #L2 #I #V1 #V2 #e #HL12 #HV12 #He
->(plus_minus_m_m e 1) /2 width=1/
-qed.
-
-lemma ltpss_tpss1_lt: ∀L1,L2,I,V1,V2,d,e.
-                      L1 [d - 1, e] ▶* L2 → L2 ⊢ V1 [d - 1, e] ▶* V2 →
-                      0 < d → L1. ⓑ{I} V1 [d, e] ▶* L2. ⓑ{I} V2.
-#L1 #L2 #I #V1 #V2 #d #e #HL12 #HV12 #Hd
->(plus_minus_m_m d 1) /2 width=1/
-qed.
-
-lemma ltpss_tps2_lt: ∀L1,L2,I,V1,V2,e.
-                     L1 [0, e - 1] ▶* L2 → L2 ⊢ V1 [0, e - 1] ▶ V2 →
-                     0 < e → L1. ⓑ{I} V1 [0, e] ▶* L2. ⓑ{I} V2.
-/3 width=1/ qed.
-
-lemma ltpss_tps1_lt: ∀L1,L2,I,V1,V2,d,e.
-                     L1 [d - 1, e] ▶* L2 → L2 ⊢ V1 [d - 1, e] ▶ V2 →
-                     0 < d → L1. ⓑ{I} V1 [d, e] ▶* L2. ⓑ{I} V2.
-/3 width=1/ qed.
-
-(* Basic_1: was by definition: csubst1_refl *)
-lemma ltpss_refl: ∀L,d,e. L [d, e] ▶* L.
-#L elim L -L //
-#L #I #V #IHL * /2 width=1/ * /2 width=1/
-qed.
-
-lemma ltpss_weak: ∀L1,L2,d1,e1. L1 [d1, e1] ▶* L2 →
-                  ∀d2,e2. d2 ≤ d1 → d1 + e1 ≤ d2 + e2 → L1 [d2, e2] ▶* L2.
-#L1 #L2 #d1 #e1 #H elim H -L1 -L2 -d1 -e1 //
-[ #L1 #L2 #I #V1 #V2 #e1 #_ #HV12 #IHL12 #d2 #e2 #Hd2 #Hde2
-  lapply (le_n_O_to_eq … Hd2) #H destruct normalize in Hde2;
-  lapply (lt_to_le_to_lt 0 … Hde2) // #He2
-  lapply (le_plus_to_minus_r … Hde2) -Hde2 /3 width=5/
-| #L1 #L2 #I #V1 #V2 #d1 #e1 #_ #HV12 #IHL12 #d2 #e2 #Hd21 #Hde12
-  >plus_plus_comm_23 in Hde12; #Hde12
-  elim (le_to_or_lt_eq 0 d2 ?) // #H destruct
-  [ lapply (le_plus_to_minus_r … Hde12) -Hde12 <plus_minus // #Hde12
-    lapply (le_plus_to_minus … Hd21) -Hd21 #Hd21 /3 width=5/
-  | -Hd21 normalize in Hde12;
-    lapply (lt_to_le_to_lt 0 … Hde12) // #He2
-    lapply (le_plus_to_minus_r … Hde12) -Hde12 /3 width=5/
-  ]
-]
-qed.  
-
-lemma ltpss_weak_all: ∀L1,L2,d,e. L1 [d, e] ▶* L2 → L1 [0, |L2|] ▶* L2.
-#L1 #L2 #d #e #H elim H -L1 -L2 -d -e
-// /3 width=2/ /3 width=3/
-qed.
-
-(* Basic forward lemmas *****************************************************)
-
-lemma ltpss_fwd_length: ∀L1,L2,d,e. L1 [d, e] ▶* L2 → |L1| = |L2|.
-#L1 #L2 #d #e #H elim H -L1 -L2 -d -e
-normalize //
-qed-.
-
 (* Basic inversion lemmas ***************************************************)
 
-fact ltpss_inv_refl_O2_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → e = 0 → L1 = L2.
+fact ltpss_inv_refl_O2_aux: ∀d,e,L1,L2. L1 ▶* [d, e] L2 → e = 0 → L1 = L2.
 #d #e #L1 #L2 #H elim H -d -e -L1 -L2 //
 [ #L1 #L2 #I #V1 #V2 #e #_ #_ #_ >commutative_plus normalize #H destruct
 | #L1 #L2 #I #V1 #V2 #d #e #_ #HV12 #IHL12 #He destruct
@@ -114,11 +41,11 @@ fact ltpss_inv_refl_O2_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → e = 0 → L1 = L
 ]
 qed.
 
-lemma ltpss_inv_refl_O2: ∀d,L1,L2. L1 [d, 0] ▶* L2 → L1 = L2.
+lemma ltpss_inv_refl_O2: ∀d,L1,L2. L1 ▶* [d, 0] L2 → L1 = L2.
 /2 width=4/ qed-.
 
 fact ltpss_inv_atom1_aux: ∀d,e,L1,L2.
-                          L1 [d, e] ▶* L2 → L1 = ⋆ → L2 = ⋆.
+                          L1 ▶* [d, e] L2 → L1 = ⋆ → L2 = ⋆.
 #d #e #L1 #L2 * -d -e -L1 -L2
 [ //
 | #L #I #V #H destruct
@@ -127,13 +54,13 @@ fact ltpss_inv_atom1_aux: ∀d,e,L1,L2.
 ]
 qed.
 
-lemma ltpss_inv_atom1: ∀d,e,L2. ⋆ [d, e] ▶* L2 → L2 = ⋆.
+lemma ltpss_inv_atom1: ∀d,e,L2. ⋆ ▶* [d, e] L2 → L2 = ⋆.
 /2 width=5/ qed-.
 
-fact ltpss_inv_tpss21_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → d = 0 → 0 < e →
+fact ltpss_inv_tpss21_aux: ∀d,e,L1,L2. L1 ▶* [d, e] L2 → d = 0 → 0 < e →
                            ∀K1,I,V1. L1 = K1. ⓑ{I} V1 →
-                           ∃∃K2,V2. K1 [0, e - 1] ▶* K2 &
-                                    K2 ⊢ V1 [0, e - 1] ▶* V2 &
+                           ∃∃K2,V2. K1 ▶* [0, e - 1] K2 &
+                                    K2 ⊢ V1 ▶* [0, e - 1] V2 &
                                     L2 = K2. ⓑ{I} V2.
 #d #e #L1 #L2 * -d -e -L1 -L2
 [ #d #e #_ #_ #K1 #I #V1 #H destruct
@@ -143,15 +70,16 @@ fact ltpss_inv_tpss21_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → d = 0 → 0 < e 
 ]
 qed.
 
-lemma ltpss_inv_tpss21: ∀e,K1,I,V1,L2. K1. ⓑ{I} V1 [0, e] ▶* L2 → 0 < e →
-                        ∃∃K2,V2. K1 [0, e - 1] ▶* K2 & K2 ⊢ V1 [0, e - 1] ▶* V2 &
+lemma ltpss_inv_tpss21: ∀e,K1,I,V1,L2. K1. ⓑ{I} V1 ▶* [0, e] L2 → 0 < e →
+                        ∃∃K2,V2. K1 ▶* [0, e - 1] K2 &
+                                 K2 ⊢ V1 ▶* [0, e - 1] V2 &
                                  L2 = K2. ⓑ{I} V2.
 /2 width=5/ qed-.
 
-fact ltpss_inv_tpss11_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → 0 < d →
+fact ltpss_inv_tpss11_aux: ∀d,e,L1,L2. L1 ▶* [d, e] L2 → 0 < d →
                            ∀I,K1,V1. L1 = K1. ⓑ{I} V1 →
-                           ∃∃K2,V2. K1 [d - 1, e] ▶* K2 &
-                                    K2 ⊢ V1 [d - 1, e] ▶* V2 &
+                           ∃∃K2,V2. K1 ▶* [d - 1, e] K2 &
+                                    K2 ⊢ V1 ▶* [d - 1, e] V2 &
                                     L2 = K2. ⓑ{I} V2.
 #d #e #L1 #L2 * -d -e -L1 -L2
 [ #d #e #_ #I #K1 #V1 #H destruct
@@ -161,14 +89,14 @@ fact ltpss_inv_tpss11_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → 0 < d →
 ]
 qed.
 
-lemma ltpss_inv_tpss11: ∀d,e,I,K1,V1,L2. K1. ⓑ{I} V1 [d, e] ▶* L2 → 0 < d →
-                        ∃∃K2,V2. K1 [d - 1, e] ▶* K2 &
-                                 K2 ⊢ V1 [d - 1, e] ▶* V2 &
+lemma ltpss_inv_tpss11: ∀d,e,I,K1,V1,L2. K1. ⓑ{I} V1 ▶* [d, e] L2 → 0 < d →
+                        ∃∃K2,V2. K1 ▶* [d - 1, e] K2 &
+                                 K2 ⊢ V1 ▶* [d - 1, e] V2 &
                                  L2 = K2. ⓑ{I} V2.
 /2 width=3/ qed-.
 
 fact ltpss_inv_atom2_aux: ∀d,e,L1,L2.
-                          L1 [d, e] ▶* L2 → L2 = ⋆ → L1 = ⋆.
+                          L1 ▶* [d, e] L2 → L2 = ⋆ → L1 = ⋆.
 #d #e #L1 #L2 * -d -e -L1 -L2
 [ //
 | #L #I #V #H destruct
@@ -177,13 +105,13 @@ fact ltpss_inv_atom2_aux: ∀d,e,L1,L2.
 ]
 qed.
 
-lemma ltpss_inv_atom2: ∀d,e,L1. L1 [d, e] ▶* ⋆ → L1 = ⋆.
+lemma ltpss_inv_atom2: ∀d,e,L1. L1 ▶* [d, e] ⋆ → L1 = ⋆.
 /2 width=5/ qed-.
 
-fact ltpss_inv_tpss22_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → d = 0 → 0 < e →
+fact ltpss_inv_tpss22_aux: ∀d,e,L1,L2. L1 ▶* [d, e] L2 → d = 0 → 0 < e →
                            ∀K2,I,V2. L2 = K2. ⓑ{I} V2 →
-                           ∃∃K1,V1. K1 [0, e - 1] ▶* K2 &
-                                    K2 ⊢ V1 [0, e - 1] ▶* V2 &
+                           ∃∃K1,V1. K1 ▶* [0, e - 1] K2 &
+                                    K2 ⊢ V1 ▶* [0, e - 1] V2 &
                                     L1 = K1. ⓑ{I} V1.
 #d #e #L1 #L2 * -d -e -L1 -L2
 [ #d #e #_ #_ #K1 #I #V1 #H destruct
@@ -193,16 +121,17 @@ fact ltpss_inv_tpss22_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → d = 0 → 0 < e 
 ]
 qed.
 
-lemma ltpss_inv_tpss22: ∀e,L1,K2,I,V2. L1 [0, e] ▶* K2. ⓑ{I} V2 → 0 < e →
-                        ∃∃K1,V1. K1 [0, e - 1] ▶* K2 & K2 ⊢ V1 [0, e - 1] ▶* V2 &
+lemma ltpss_inv_tpss22: ∀e,L1,K2,I,V2. L1 ▶* [0, e] K2. ⓑ{I} V2 → 0 < e →
+                        ∃∃K1,V1. K1 ▶* [0, e - 1] K2 &
+                                 K2 ⊢ V1 ▶* [0, e - 1] V2 &
                                  L1 = K1. ⓑ{I} V1.
 /2 width=5/ qed-.
 
-fact ltpss_inv_tpss12_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → 0 < d →
+fact ltpss_inv_tpss12_aux: ∀d,e,L1,L2. L1 ▶* [d, e] L2 → 0 < d →
                            ∀I,K2,V2. L2 = K2. ⓑ{I} V2 →
-                           ∃∃K1,V1. K1 [d - 1, e] ▶* K2 &
-                                    K2 ⊢ V1 [d - 1, e] ▶* V2 &
-                                  L1 = K1. ⓑ{I} V1.
+                           ∃∃K1,V1. K1 ▶* [d - 1, e] K2 &
+                                    K2 ⊢ V1 ▶* [d - 1, e] V2 &
+                                    L1 = K1. ⓑ{I} V1.
 #d #e #L1 #L2 * -d -e -L1 -L2
 [ #d #e #_ #I #K2 #V2 #H destruct
 | #L #I #V #H elim (lt_refl_false … H)
@@ -211,13 +140,142 @@ fact ltpss_inv_tpss12_aux: ∀d,e,L1,L2. L1 [d, e] ▶* L2 → 0 < d →
 ]
 qed.
 
-lemma ltpss_inv_tpss12: ∀L1,K2,I,V2,d,e. L1 [d, e] ▶* K2. ⓑ{I} V2 → 0 < d →
-                        ∃∃K1,V1. K1 [d - 1, e] ▶* K2 &
-                                 K2 ⊢ V1 [d - 1, e] ▶* V2 &
+lemma ltpss_inv_tpss12: ∀L1,K2,I,V2,d,e. L1 ▶* [d, e] K2. ⓑ{I} V2 → 0 < d →
+                        ∃∃K1,V1. K1 ▶* [d - 1, e] K2 &
+                                 K2 ⊢ V1 ▶* [d - 1, e] V2 &
                                  L1 = K1. ⓑ{I} V1.
 /2 width=3/ qed-.
 
-(* Basic_1: removed theorems 27:
+(* Basic properties *********************************************************)
+
+lemma ltpss_tps2: ∀L1,L2,I,V1,V2,e.
+                  L1 ▶* [0, e] L2 → L2 ⊢ V1 ▶ [0, e] V2 →
+                  L1. ⓑ{I} V1 ▶* [0, e + 1] L2. ⓑ{I} V2.
+/3 width=1/ qed.
+
+lemma ltpss_tps1: ∀L1,L2,I,V1,V2,d,e.
+                  L1 ▶* [d, e] L2 → L2 ⊢ V1 ▶ [d, e] V2 →
+                  L1. ⓑ{I} V1 ▶* [d + 1, e] L2. ⓑ{I} V2.
+/3 width=1/ qed.
+
+lemma ltpss_tpss2_lt: ∀L1,L2,I,V1,V2,e.
+                      L1 ▶* [0, e - 1] L2 → L2 ⊢ V1 ▶* [0, e - 1] V2 →
+                      0 < e → L1. ⓑ{I} V1 ▶* [0, e] L2. ⓑ{I} V2.
+#L1 #L2 #I #V1 #V2 #e #HL12 #HV12 #He
+>(plus_minus_m_m e 1) /2 width=1/
+qed.
+
+lemma ltpss_tpss1_lt: ∀L1,L2,I,V1,V2,d,e.
+                      L1 ▶* [d - 1, e] L2 → L2 ⊢ V1 ▶* [d - 1, e] V2 →
+                      0 < d → L1. ⓑ{I} V1 ▶* [d, e] L2. ⓑ{I} V2.
+#L1 #L2 #I #V1 #V2 #d #e #HL12 #HV12 #Hd
+>(plus_minus_m_m d 1) /2 width=1/
+qed.
+
+lemma ltpss_tps2_lt: ∀L1,L2,I,V1,V2,e.
+                     L1 ▶* [0, e - 1] L2 → L2 ⊢ V1 ▶ [0, e - 1] V2 →
+                     0 < e → L1. ⓑ{I} V1 ▶* [0, e] L2. ⓑ{I} V2.
+/3 width=1/ qed.
+
+lemma ltpss_tps1_lt: ∀L1,L2,I,V1,V2,d,e.
+                     L1 ▶* [d - 1, e] L2 → L2 ⊢ V1 ▶ [d - 1, e] V2 →
+                     0 < d → L1. ⓑ{I} V1 ▶* [d, e] L2. ⓑ{I} V2.
+/3 width=1/ qed.
+
+(* Basic_1: was by definition: csubst1_refl *)
+lemma ltpss_refl: ∀L,d,e. L ▶* [d, e] L.
+#L elim L -L //
+#L #I #V #IHL * /2 width=1/ * /2 width=1/
+qed.
+
+lemma ltpss_weak: ∀L1,L2,d1,e1. L1 ▶* [d1, e1] L2 →
+                  ∀d2,e2. d2 ≤ d1 → d1 + e1 ≤ d2 + e2 → L1 ▶* [d2, e2] L2.
+#L1 #L2 #d1 #e1 #H elim H -L1 -L2 -d1 -e1 //
+[ #L1 #L2 #I #V1 #V2 #e1 #_ #HV12 #IHL12 #d2 #e2 #Hd2 #Hde2
+  lapply (le_n_O_to_eq … Hd2) #H destruct normalize in Hde2;
+  lapply (lt_to_le_to_lt 0 … Hde2) // #He2
+  lapply (le_plus_to_minus_r … Hde2) -Hde2 /3 width=5/
+| #L1 #L2 #I #V1 #V2 #d1 #e1 #_ #HV12 #IHL12 #d2 #e2 #Hd21 #Hde12
+  >plus_plus_comm_23 in Hde12; #Hde12
+  elim (le_to_or_lt_eq 0 d2 ?) // #H destruct
+  [ lapply (le_plus_to_minus_r … Hde12) -Hde12 <plus_minus // #Hde12
+    lapply (le_plus_to_minus … Hd21) -Hd21 #Hd21 /3 width=5/
+  | -Hd21 normalize in Hde12;
+    lapply (lt_to_le_to_lt 0 … Hde12) // #He2
+    lapply (le_plus_to_minus_r … Hde12) -Hde12 /3 width=5/
+  ]
+]
+qed.
+
+lemma ltpss_weak_all: ∀L1,L2,d,e. L1 ▶* [d, e] L2 → L1 ▶* [0, |L2|] L2.
+#L1 #L2 #d #e #H elim H -L1 -L2 -d -e
+// /3 width=2/ /3 width=3/
+qed.
+
+fact ltpss_append_le_aux: ∀K1,K2,d,x. K1 ▶* [d, x] K2 → x = |K1| - d →
+                          ∀L1,L2,e. L1 ▶* [0, e] L2 → d ≤ |K1| →
+                          L1 @@ K1 ▶* [d, x + e] L2 @@ K2.
+#K1 #K2 #d #x #H elim H -K1 -K2 -d -x
+[ #d #x #H1 #L1 #L2 #e #HL12 #H2 destruct
+  lapply (le_n_O_to_eq … H2) -H2 #H destruct //
+| #K #I #V <minus_n_O normalize <plus_n_Sm #H destruct
+| #K1 #K2 #I #V1 #V2 #x #_ #HV12 <minus_n_O #IHK12 <minus_n_O #H #L1 #L2 #e #HL12 #_
+  lapply (injective_plus_l … H) -H #H destruct >plus_plus_comm_23
+  /4 width=5 by ltpss_tpss2, tpss_append, tpss_weak, monotonic_le_plus_r/ (**) (* too slow without trace *)
+| #K1 #K2 #I #V1 #V2 #d #x #_ #HV12 #IHK12 normalize <minus_le_minus_minus_comm // <minus_plus_m_m #H1 #L1 #L2 #e #HL12 #H2 destruct
+  lapply (le_plus_to_le_r … H2) -H2 #Hd
+  /4 width=5 by ltpss_tpss1, tpss_append, tpss_weak, monotonic_le_plus_r/ (**) (* too slow without trace *)
+]
+qed-.
+
+lemma ltpss_append_le: ∀K1,K2,d. K1 ▶* [d, |K1| - d] K2 →
+                       ∀L1,L2,e. L1 ▶* [0, e] L2 → d ≤ |K1| →
+                       L1 @@ K1 ▶* [d, |K1| - d + e] L2 @@ K2.
+/2 width=1 by ltpss_append_le_aux/ qed.
+
+lemma ltpss_append_ge: ∀K1,K2,d,e. K1 ▶* [d, e] K2 →
+                       ∀L1,L2. L1 ▶* [d - |K1|, e] L2 → |K1| ≤ d →
+                       L1 @@ K1 ▶* [d, e] L2 @@ K2.
+#K1 #K2 #d #e #H elim H -K1 -K2 -d -e
+[ #d #e #L1 #L2 <minus_n_O //
+| #K #I #V #L1 #L2 #_ #H 
+  lapply (le_n_O_to_eq … H) -H normalize <plus_n_Sm #H destruct
+| #K1 #K2 #I #V1 #V2 #e #_ #_ #_ #L1 #L2 #_ #H
+  lapply (le_n_O_to_eq … H) -H normalize <plus_n_Sm #H destruct
+| #K1 #K2 #I #V1 #V2 #d #e #_ #HV12 #IHK12 #L1 #L2
+  normalize <minus_le_minus_minus_comm // <minus_plus_m_m #HL12 #H
+  lapply (le_plus_to_le_r … H) -H /3 width=1/
+]
+qed.
+
+(* Basic forward lemmas *****************************************************)
+
+lemma ltpss_fwd_length: ∀L1,L2,d,e. L1 ▶* [d, e] L2 → |L1| = |L2|.
+#L1 #L2 #d #e #H elim H -L1 -L2 -d -e
+normalize //
+qed-.
+(*
+lemma tps_fwd_shift1: ∀L1,L,T1,T,d,e. L ⊢ L1 @@ T1 ▶ [d, e] T →
+                      ∃∃L2,T2. L @@ L1 ▶* [d + |L1|, e] L @@ L2 & T = L2 @@ T2.
+#L1 @(lenv_ind_dx … L1) -L1
+[ #L #T1 #T #d #e #_ @ex2_2_intro [3: // |4: // |1,2: skip ] (**) (* /2 width=4/ does not work *)
+| #I #L1 #V1 #IH #L #T1 #T #d #e >shift_append_assoc #H
+  elim (tps_inv_bind1 … H) -H #V2 #T2 #HV12 #HT12 #H destruct
+  elim (IH … HT12) -IH -T1 #L2 #T #HL12 #H destruct
+  <append_assoc >append_length <associative_plus
+  @(ex2_2_intro … (⋆.ⓑ{I}V2@@L2)) /2 width=4/ <append_assoc normalize
+  lapply (ltpss_tps1 L … I … HV12) -HV12 // #HV12 
+  @ltpss_append_ge /2/
+(*  
+  
+  
+   /3 width=5/
+*)
+]
+qed-.
+*)
+
+(* Basic_1: removed theorems 28:
             csubst0_clear_O csubst0_drop_lt csubst0_drop_gt csubst0_drop_eq
             csubst0_clear_O_back csubst0_clear_S csubst0_clear_trans
             csubst0_drop_gt_back csubst0_drop_eq_back csubst0_drop_lt_back
@@ -226,5 +284,5 @@ lemma ltpss_inv_tpss12: ∀L1,K2,I,V2,d,e. L1 [d, e] ▶* K2. ⓑ{I} V2 → 0 <
             csubst0_snd_bind csubst0_fst_bind csubst0_both_bind
             csubst1_head csubst1_flat csubst1_gen_head
             csubst1_getl_ge csubst1_getl_lt csubst1_getl_ge_back getl_csubst1
-
+            fsubst0_gen_base
 *)