X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fstatic%2Ffrees_drops.ma;h=aa4f34998ffe6732e4d870dec140ff248daaf5ff;hb=926796df5884453d8f0cf9f294d7776d469ef45b;hp=fd4ec0ce18854cdcac109112a786ab1ddd8db7d0;hpb=e06774421eb3b8f4438a6876cc1ab4262ef16f6e;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/static/frees_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/static/frees_drops.ma
index fd4ec0ce1..aa4f34998 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/frees_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/frees_drops.ma
@@ -14,19 +14,19 @@
 
 include "ground_2/relocation/rtmap_pushs.ma".
 include "ground_2/relocation/rtmap_coafter.ma".
-include "basic_2/relocation/lifts_lifts.ma".
-include "basic_2/relocation/drops.ma".
+include "basic_2/relocation/drops_drops.ma".
 include "basic_2/static/frees.ma".
 
 (* CONTEXT-SENSITIVE FREE VARIABLES *****************************************)
 
 (* Advanced properties ******************************************************)
 
-lemma frees_lref_atom: ∀L,i. ⬇*[Ⓕ, 𝐔❴i❵] L ≡ ⋆ → L ⊢ 𝐅*⦃#i⦄ ≡ 𝐈𝐝.
-#L elim L -L /2 width=1 by frees_atom/
+lemma frees_lref_atom: ∀b,L,i. ⬇*[b, 𝐔❴i❵] L ≡ ⋆ →
+                       ∀f. 𝐈⦃f⦄ → L ⊢ 𝐅*⦃#i⦄ ≡ f.
+#b #L elim L -L /2 width=1 by frees_atom/
 #L #I #V #IH *
 [ #H lapply (drops_fwd_isid … H ?) -H // #H destruct
-| /4 width=3 by frees_lref, drops_inv_drop1/
+| /5 width=3 by frees_eq_repl_back, frees_lref, drops_inv_drop1, eq_push_inv_isid/
 ]
 qed.
 
@@ -58,6 +58,91 @@ qed-.
 
 (* Properties with generic slicing for local environments *******************)
 
+axiom coafter_inv_xpx: ∀g2,f1,g. g2 ~⊚ ↑f1 ≡ g → ∀n. @⦃0, g2⦄ ≡ n →
+                       ∃∃f2,f. f2 ~⊚ f1 ≡ f & ⫱*[n]g2 = ↑f2 & ⫱*[n]g = ↑f.
+(*
+#g2 #g1 #g #Hg #n #Hg2
+lapply (coafter_tls … Hg2 … Hg) -Hg #Hg
+lapply (at_pxx_tls … Hg2) -Hg2 #H
+elim (at_inv_pxp … H) -H [ |*: // ] #f2 #H2
+elim (coafter_inv_pxx … Hg … H2) -Hg * #f1 #f #Hf #H1 #H0 destruct   
+<tls_rew_S <tls_rew_S <H2 <H0 -g2 -g -n //
+qed.
+*)
+
+lemma coafter_tls_succ: ∀g2,g1,g. g2 ~⊚ g1 ≡ g →
+                        ∀n. @⦃0, g2⦄ ≡ n → ⫱*[⫯n]g2 ~⊚ ⫱g1 ≡ ⫱*[⫯n]g.
+#g2 #g1 #g #Hg #n #Hg2
+lapply (coafter_tls … Hg2 … Hg) -Hg #Hg
+lapply (at_pxx_tls … Hg2) -Hg2 #H
+elim (at_inv_pxp … H) -H [ |*: // ] #f2 #H2
+elim (coafter_inv_pxx … Hg … H2) -Hg * #f1 #f #Hf #H1 #H0 destruct   
+<tls_rew_S <tls_rew_S <H2 <H0 -g2 -g -n //
+qed.
+
+lemma frees_lifts: ∀b,f1,K,T. K ⊢ 𝐅*⦃T⦄ ≡ f1 →
+                   ∀f,L. ⬇*[b, f] L ≡ K → ∀U. ⬆*[f] T ≡ U →
+                   ∀f2. f ~⊚ f1 ≡ f2 → L ⊢ 𝐅*⦃U⦄ ≡ f2.
+#b #f1 #K #T #H lapply (frees_fwd_isfin … H) elim H -f1 -K -T
+[ #f1 #I #Hf1 #_ #f #L #H1 #U #H2 #f2 #H3
+  lapply (coafter_isid_inv_dx … H3 … Hf1) -f1 #Hf2
+  elim (lifts_inv_atom1 … H2) -H2 *
+  /2 width=1 by frees_sort_gen, frees_gref_gen/
+  #i #j #Hij #H #H0 destruct
+  elim (drops_inv_atom2 … H1) -H1 #n #g #H1 #Hf
+  elim (after_at_fwd … Hij … Hf) -f #x #_ #Hj -g -i
+  lapply (at_inv_uni … Hj) -Hj #H destruct
+  /3 width=8 by frees_lref_atom, drops_trans/
+| #f1 #I #K #V #s #_ #IH #Hf1 #f #L #H1 #U #H2 #f2 #H3
+  lapply (isfin_fwd_push … Hf1 ??) -Hf1 [3: |*: // ] #Hf1
+  lapply (lifts_inv_sort1 … H2) -H2 #H destruct
+  lapply (at_total 0 f) #H
+  elim (drops_split_trans … H1) -H1
+  [5: @(after_uni_dx … H) /2 width=1 by after_isid_dx/ |2,3: skip
+  |4: // ] #X #HLX #HXK
+  lapply (drops_inv_tls_at … H … HXK) -HXK #HXK
+  elim (drops_inv_skip2 … HXK) -HXK
+  #Y #W #HYK #HVW #H0 destruct
+(*  
+    
+  elim (coafter_inv_xpx … H3 ??) -H3 [ |*: // ] #g2 #g #Hg #H2 #H0 
+  lapply (IH … Hg) -IH -Hg
+  [1,5: // | skip
+  | 
+  |6: #H 
+*)
+
+  lapply (coafter_tls_succ … H3 ??) -H3 [3: |*: // ] #H3
+  lapply (IH … HYK … H3) -IH -H3 -HYK
+  [1,3: // | skip ]
+  #H lapply (frees_sort … H)
+   
+   ]
+
+  
+  elim (coafter_inv_xxp … H3) -H3 [1,3: * |*: // ]
+  [ #g #g1 #Hf2 #H #H0 destruct
+    elim (drops_inv_skip1 … H1) -H1 #K #V #HLK #_ #H destruct
+  | #g #Hf2 #H destruct
+    lapply (drops_inv_drop1 … H1) -H1
+  ] /3 width=4 by frees_sort/
+
+|
+|
+|
+| #f1V #f1T #f1 #p #I #K #V #T #_ #_ #H1f1 #IHV #IHT #H2f1 #f #L #H1 #Y #H2 #f2 #H3
+  elim (sor_inv_isfin3 … H1f1) // #Hf1V #H
+  lapply (isfin_inv_tl … H) -H
+  elim (lifts_inv_bind1 … H2) -H2 #W #U #HVW #HTU #H destruct
+  elim (coafter_sor … H3 … H1f1) /2 width=5 by coafter_isfin2_fwd/ -H3 -H1f1 #f2V #f2T #Hf2V #H
+  elim (coafter_inv_tl1 … H) -H /4 width=5 by frees_bind, drops_skip/
+| #f1V #f1T #f1 #I #K #V #T #_ #_ #H1f1 #IHV #IHT #H2f1 #f #L #H1 #Y #H2 #f2 #H3
+  elim (sor_inv_isfin3 … H1f1) //
+  elim (lifts_inv_flat1 … H2) -H2 #W #U #HVW #HTU #H destruct
+  elim (coafter_sor … H3 … H1f1)
+  /3 width=5 by coafter_isfin2_fwd, frees_flat/
+]
+
 (* Inversion lemmas with generic slicing for local environments *************)
 
 lemma frees_inv_lifts: ∀b,f2,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f2 →
@@ -67,8 +152,7 @@ lemma frees_inv_lifts: ∀b,f2,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f2 →
 [ #f2 #I #Hf2 #_ #f #K #H1 #T #H2 #f1 #H3
   lapply (coafter_fwd_isid2 … H3 … Hf2) -H3 // -Hf2 #Hf1
   elim (drops_inv_atom1 … H1) -H1 #H #_ destruct
-  elim (lifts_fwd_atom2 … H2) -H2
-  /2 width=3 by frees_atom/
+  elim (lifts_inv_atom2 … H2) -H2 * /2 width=3 by frees_atom/
 | #f2 #I #L #W #s #_ #IH #Hf2 #f #Y #H1 #T #H2 #f1 #H3
   lapply (isfin_fwd_push … Hf2 ??) -Hf2 [3: |*: // ] #Hf2
   lapply (lifts_inv_sort2 … H2) -H2 #H destruct
@@ -117,3 +201,68 @@ lemma frees_inv_lifts: ∀b,f2,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f2 →
   elim (coafter_inv_sor … H3 … H1f2) -H3 -H1f2 /3 width=5 by frees_flat/
 ]
 qed-.
+
+lemma frees_inv_drops: ∀f2,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f2 →
+                       ∀f,K. ⬇*[Ⓣ, f] L ≡ K → ∀f1. f ~⊚ f1 ≡ f2 →
+                       ∃∃T. K ⊢ 𝐅*⦃T⦄ ≡ f1 & ⬆*[f] T ≡ U.
+#f2 #L #U #H lapply (frees_fwd_isfin … H) elim H -f2 -L -U
+[ #f2 #I #Hf2 #_ #f #K #H1 #f1 #H2
+  lapply (coafter_fwd_isid2 … H2 ??) -H2 // -Hf2 #Hf1
+  elim (drops_inv_atom1 … H1) -H1 #H #Hf destruct
+  /4 width=3 by frees_atom, lifts_refl, ex2_intro/
+| #f2 #I #L #W #s #_ #IH #Hf2 #f #Y #H1 #f1 #H2
+  lapply (isfin_fwd_push … Hf2 ??) -Hf2 [3: |*: // ] #Hf2
+  elim (coafter_inv_xxp … H2) -H2 [1,3: * |*: // ]
+  [ #g #g1 #Hf2 #H #H0 destruct
+    elim (drops_inv_skip1 … H1) -H1 #K #V #HLK #_ #H destruct
+  | #g #Hf2 #H destruct
+    lapply (drops_inv_drop1 … H1) -H1 #HLK
+  ]
+  elim (IH … HLK … Hf2) -L // -f2 #X #Hg1 #HX
+  lapply (lifts_inv_sort2 … HX) -HX #H destruct
+  /3 width=3 by frees_sort, lifts_sort, ex2_intro/
+| #f2 #I #L #W #_ #IH #Hf2 #f #Y #H1 #f1 #H2
+  lapply (isfin_inv_next … Hf2 ??) -Hf2 [3: |*: // ] #Hf2
+  elim (coafter_inv_xxn … H2) -H2 [ |*: // ] #g #g1 #Hf2 #H0 #H destruct
+  elim (drops_inv_skip1 … H1) -H1 #K #V #HLK #HVW #H destruct
+  elim (IH … HLK … Hf2) -L // -f2 #X #Hg1 #HX
+  lapply (lifts_inj … HX … HVW) -W #H destruct
+  /3 width=3 by frees_zero, lifts_lref, ex2_intro/
+| #f2 #I #L #W #j #_ #IH #Hf2 #f #Y #H1 #f1 #H2
+  lapply (isfin_fwd_push … Hf2 ??) -Hf2 [3: |*: // ] #Hf2
+  elim (coafter_inv_xxp … H2) -H2 [1,3: * |*: // ]
+  [ #g #g1 #Hf2 #H #H0 destruct
+    elim (drops_inv_skip1 … H1) -H1 #K #V #HLK #_ #H destruct
+  | #g #Hf2 #H destruct
+    lapply (drops_inv_drop1 … H1) -H1 #HLK
+  ]
+  elim (IH … HLK … Hf2) -L // -f2 #X #Hg1 #HX
+  elim (lifts_inv_lref2 … HX) -HX #i #Hij #H destruct
+  /4 width=7 by frees_lref, lifts_lref, at_S1, at_next, ex2_intro/
+| #f2 #I #L #W #l #_ #IH #Hf2 #f #Y #H1 #f1 #H2
+  lapply (isfin_fwd_push … Hf2 ??) -Hf2 [3: |*: // ] #Hf2
+  elim (coafter_inv_xxp … H2) -H2 [1,3: * |*: // ]
+  [ #g #g1 #Hf2 #H #H0 destruct
+    elim (drops_inv_skip1 … H1) -H1 #K #V #HLK #_ #H destruct
+  | #g #Hf2 #H destruct
+    lapply (drops_inv_drop1 … H1) -H1 #HLK
+  ]
+  elim (IH … HLK … Hf2) -L // -f2 #X #Hg1 #HX
+  lapply (lifts_inv_gref2 … HX) -HX #H destruct
+  /3 width=3 by frees_gref, lifts_gref, ex2_intro/
+| #f2W #f2U #f2 #p #I #L #W #U #_ #_ #H1f2 #IHW #IHU #H2f2 #f #K #H1 #f1 #H2
+  elim (sor_inv_isfin3 … H1f2) // #H1f2W #H
+  lapply (isfin_inv_tl … H) -H #H1f2U
+  elim (coafter_inv_sor … H2 … H1f2) -H2 -H1f2 // #f1W #f1U #H2f2W #H #Hf1
+  elim (coafter_inv_tl0 … H) -H #g1 #H2f2U #H destruct
+  elim (IHW … H1 … H2f2W) -IHW -H2f2W // -H1f2W #V #Hf1W #HVW
+  elim (IHU … H2f2U) -IHU -H2f2U
+  /3 width=5 by frees_bind, drops_skip, lifts_bind, ex2_intro/
+| #f2W #f2U #f2 #I #L #W #U #_ #_ #H1f2 #IHW #IHU #H2f2 #f #K #H1 #f1 #H2
+  elim (sor_inv_isfin3 … H1f2) // #H1f2W #H1f2U
+  elim (coafter_inv_sor … H2 … H1f2) -H2 -H1f2 // #f1W #f1U #H2f2W #H2f2U #Hf1
+  elim (IHW … H1 … H2f2W) -IHW -H2f2W // -H1f2W
+  elim (IHU … H1 … H2f2U) -L -H2f2U
+  /3 width=5 by frees_flat, lifts_flat, ex2_intro/
+]
+qed-.