X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fstatic%2Ffrees_drops.ma;h=f153ad53cab0704ed87278833552481d6705f9ff;hb=b4b5f03ffca4f250a1dc02f277b70e4f33ac8a9b;hp=fd4ec0ce18854cdcac109112a786ab1ddd8db7d0;hpb=d64b4238ec803353f0a06f2aad25c173852b0526;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..f153ad53c 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/static/frees_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/static/frees_drops.ma
@@ -12,21 +12,21 @@
 (*                                                                        *)
 (**************************************************************************)
 
-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/static/frees.ma".
+include "ground_2/relocation/nstream_coafter.ma".
+include "basic_2/relocation/drops_drops.ma".
+include "basic_2/static/frees_fqup.ma".
+include "basic_2/static/frees_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.
 
@@ -38,6 +38,31 @@ lemma frees_lref_pair: ∀f,K,V. K ⊢ 𝐅*⦃V⦄ ≡ f →
 ]
 qed.
 
+lemma frees_sort_pushs: ∀f,K,s. K ⊢ 𝐅*⦃⋆s⦄ ≡ f →
+                        ∀i,L. ⬇*[i] L ≡ K → L ⊢ 𝐅*⦃⋆s⦄ ≡ ↑*[i] f.
+#f #K #s #Hf #i elim i -i
+[ #L #H lapply (drops_fwd_isid … H ?) -H //
+| #i #IH #L #H elim (drops_inv_succ … H) -H /3 width=1 by frees_sort/
+]
+qed.
+
+lemma frees_lref_pushs: ∀f,K,j. K ⊢ 𝐅*⦃#j⦄ ≡ f →
+                        ∀i,L. ⬇*[i] L ≡ K → L ⊢ 𝐅*⦃#(i+j)⦄ ≡ ↑*[i] f.
+#f #K #j #Hf #i elim i -i
+[ #L #H lapply (drops_fwd_isid … H ?) -H //
+| #i #IH #L #H elim (drops_inv_succ … H) -H
+  #I #Y #V #HYK #H destruct /3 width=1 by frees_lref/
+]
+qed.
+
+lemma frees_gref_pushs: ∀f,K,l. K ⊢ 𝐅*⦃§l⦄ ≡ f →
+                        ∀i,L. ⬇*[i] L ≡ K → L ⊢ 𝐅*⦃§l⦄ ≡ ↑*[i] f.
+#f #K #l #Hf #i elim i -i
+[ #L #H lapply (drops_fwd_isid … H ?) -H //
+| #i #IH #L #H elim (drops_inv_succ … H) -H /3 width=1 by frees_gref/
+]
+qed.
+
 (* Advanced inversion lemmas ************************************************)
 
 lemma frees_inv_lref_drops: ∀i,f,L. L ⊢ 𝐅*⦃#i⦄ ≡ f →
@@ -58,62 +83,160 @@ qed-.
 
 (* Properties with generic slicing for local environments *******************)
 
+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
+  elim (drops_split_trans_pair2 … H1) -H1 [ |*: // ] #Y #W #HLY #HYK #_
+  elim (coafter_fwd_xpx_pushs … H3) [ |*: // ] #g2 #H2 destruct
+  lapply (coafter_tls_succ … H3 ??) -H3 [3: |*: // ] #H3
+  lapply (IH … HYK … H3) -IH -H3 -HYK [1,3: // | skip ]
+  /3 width=5 by drops_isuni_fwd_drop2, frees_sort_pushs/
+| #f1 #I #K #V #_ #IH #Hf1 #f #L #H1 #U #H2 #f2 #H3
+  lapply (isfin_inv_next … Hf1 ??) -Hf1 [3: |*: // ] #Hf1
+  lapply (lifts_inv_lref1 … H2) -H2 * #j #Hf #H destruct
+  elim (drops_split_trans_pair2 … H1) -H1 [ |*: // ] #Y #W #HLY #HYK #HVW
+  elim (coafter_fwd_xnx_pushs … H3) [ |*: // ] #g2 #H2 destruct
+  lapply (coafter_tls_succ … H3 ??) -H3 [3: |*: // ]
+  <tls_S in ⊢ (???%→?); <tls_pushs <tl_next_rew <tl_next_rew #H3
+  lapply (IH … HYK … HVW … H3) -IH -H3 -HYK -HVW //
+  /2 width=5 by frees_lref_pair/
+| #f1 #I #K #V #i #_ #IH #Hf1 #f #L #H1 #U #H2 #f2 #H3
+  lapply (isfin_fwd_push … Hf1 ??) -Hf1 [3: |*: // ] #Hf1
+  lapply (lifts_inv_lref1 … H2) -H2 * #x #Hf #H destruct
+  elim (at_inv_nxx … Hf) -Hf [ |*: // ] #j #Hf #H destruct
+  elim (drops_split_trans_pair2 … H1) -H1 [ |*: // ] #Y #W #HLY #HYK #_
+  elim (coafter_fwd_xpx_pushs … H3) [ |*: // ] #g2 #H2 destruct
+  lapply (coafter_tls_succ … H3 ??) -H3 [3: |*: // ] <tls_pushs #H3
+  lapply (drops_isuni_fwd_drop2 … HLY) -HLY // #HLY
+  lapply (IH … HYK … H3) -IH -H3 -HYK [4: |*: /2 width=2 by lifts_lref/ ]
+  >plus_S1 /2 width=3 by frees_lref_pushs/ (**) (* full auto fails *)
+| #f1 #I #K #V #l #_ #IH #Hf1 #f #L #H1 #U #H2 #f2 #H3
+  lapply (isfin_fwd_push … Hf1 ??) -Hf1 [3: |*: // ] #Hf1
+  lapply (lifts_inv_gref1 … H2) -H2 #H destruct
+  elim (drops_split_trans_pair2 … H1) -H1 [ |*: // ] #Y #W #HLY #HYK #_
+  elim (coafter_fwd_xpx_pushs … H3) [ |*: // ] #g2 #H2 destruct
+  lapply (coafter_tls_succ … H3 ??) -H3 [3: |*: // ] #H3
+  lapply (IH … HYK … H3) -IH -H3 -HYK [1,3: // | skip ]
+  /3 width=5 by drops_isuni_fwd_drop2, frees_gref_pushs/
+| #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/
+]
+qed-.
+
+(* Forward lemmas with generic slicing for local environments ***************)
+
+lemma frees_fwd_coafter: ∀b,f2,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f2 →
+                         ∀f,K. ⬇*[b, f] L ≡ K → ∀T. ⬆*[f] T ≡ U →
+                         ∀f1. K ⊢ 𝐅*⦃T⦄ ≡ f1 → f ~⊚ f1 ≡ f2.
+/4 width=11 by frees_lifts, frees_mono, coafter_eq_repl_back0/ qed-.
+
 (* Inversion lemmas with generic slicing for local environments *************)
 
+lemma frees_inv_lifts_ex: ∀b,f2,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f2 →
+                          ∀f,K. ⬇*[b, f] L ≡ K → ∀T. ⬆*[f] T ≡ U →
+                          ∃∃f1. f ~⊚ f1 ≡ f2 & K ⊢ 𝐅*⦃T⦄ ≡ f1.
+#b #f2 #L #U #Hf2 #f #K #HLK #T elim (frees_total K T)
+/3 width=9 by frees_fwd_coafter, ex2_intro/
+qed-.
+
+lemma frees_inv_lifts_SO: ∀b,f,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f →
+                          ∀K. ⬇*[b, 𝐔❴1❵] L ≡ K → ∀T. ⬆*[1] T ≡ U →
+                          K ⊢ 𝐅*⦃T⦄ ≡ ⫱f.
+#b #f #L #U #H #K #HLK #T #HTU elim(frees_inv_lifts_ex … H … HLK … HTU) -b -L -U
+#f1 #Hf #Hf1 elim (coafter_inv_nxx … Hf) -Hf
+/3 width=5 by frees_eq_repl_back, coafter_isid_inv_sn/
+qed-.
+
 lemma frees_inv_lifts: ∀b,f2,L,U. L ⊢ 𝐅*⦃U⦄ ≡ f2 →
                        ∀f,K. ⬇*[b, f] L ≡ K → ∀T. ⬆*[f] T ≡ U →
                        ∀f1. f ~⊚ f1 ≡ f2 → K ⊢ 𝐅*⦃T⦄ ≡ f1.
-#b #f2 #L #U #H lapply (frees_fwd_isfin … H) elim H -f2 -L -U
-[ #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/
-| #f2 #I #L #W #s #_ #IH #Hf2 #f #Y #H1 #T #H2 #f1 #H3
+#b #f2 #L #U #H #f #K #HLK #T #HTU #f1 #Hf2 elim (frees_inv_lifts_ex … H … HLK … HTU) -b -L -U
+/3 width=7 by frees_eq_repl_back, coafter_inj/
+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
-  lapply (lifts_inv_sort2 … H2) -H2 #H destruct
-  elim (coafter_inv_xxp … H3) -H3 [1,3: * |*: // ]
+  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
-  ] /3 width=4 by frees_sort/
-| #f2 #I #L #W #_ #IH #Hf2 #f #Y #H1 #T #H2 #f1 #H3
+    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 (lifts_inv_lref2 … H2) -H2 #i #H2 #H destruct
-  lapply (at_inv_xxp … H2 ?) -H2 // * #g #H #H0 destruct
+  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 (coafter_inv_pxn … H3) -H3 [ |*: // ] #g1 #Hf2 #H destruct
-  /3 width=4 by frees_zero/
-| #f2 #I #L #W #j #_ #IH #Hf2 #f #Y #H1 #T #H2 #f1 #H3
+  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 (lifts_inv_lref2 … H2) -H2 #x #H2 #H destruct
-  elim (coafter_inv_xxp … H3) -H3 [1,3: * |*: // ]
+  elim (coafter_inv_xxp … H2) -H2 [1,3: * |*: // ]
   [ #g #g1 #Hf2 #H #H0 destruct
-    elim (drops_inv_skip1 … H1) -H1 #K #V #HLK #HVW #H destruct
-    elim (at_inv_xpn … H2) -H2 [ |*: // ] #j #Hg #H destruct
+    elim (drops_inv_skip1 … H1) -H1 #K #V #HLK #_ #H destruct
   | #g #Hf2 #H destruct
-    lapply (drops_inv_drop1 … H1) -H1
-    lapply (at_inv_xnn … H2 ????) -H2 [5: |*: // ]
-  ] /4 width=4 by lifts_lref, frees_lref/
-| #f2 #I #L #W #l #_ #IH #Hf2 #f #Y #H1 #T #H2 #f1 #H3
+    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
-  lapply (lifts_inv_gref2 … H2) -H2 #H destruct
-  elim (coafter_inv_xxp … H3) -H3 [1,3: * |*: // ]
+  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
-  ] /3 width=4 by frees_gref/
-| #f2W #f2U #f2 #p #I #L #W #U #_ #_ #H1f2 #IHW #IHU #H2f2 #f #K #H1 #X #H2 #f1 #H3
+    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
-  elim (lifts_inv_bind2 … H2) -H2 #V #T #HVW #HTU #H destruct
-  elim (coafter_inv_sor … H3 … H1f2) -H3 -H1f2 // #f1W #f1U #H2f2W #H
-  elim (coafter_inv_tl0 … H) -H /4 width=5 by frees_bind, drops_skip/
-| #f2W #f2U #f2 #I #L #W #U #_ #_ #H1f2 #IHW #IHU #H2f2 #f #K #H1 #X #H2 #f1 #H3
-  elim (sor_inv_isfin3 … H1f2) //
-  elim (lifts_inv_flat2 … H2) -H2 #V #T #HVW #HTU #H destruct
-  elim (coafter_inv_sor … H3 … H1f2) -H3 -H1f2 /3 width=5 by frees_flat/
+  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-.