X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Fdynamic%2Fsnv_ltpr.ma;h=79ca41081e153de610dccdc5f99b8f2265fabbf9;hb=8ff4315142253a1a0478b67c07dddf70c36f50cd;hp=07ac7b5432a9a18d7e45840dd7b1d59f61cdd5fa;hpb=420a46d71dc2c9b7e88514a717ea9637b842ce6a;p=helm.git

diff --git a/matita/matita/contribs/lambdadelta/basic_2/dynamic/snv_ltpr.ma b/matita/matita/contribs/lambdadelta/basic_2/dynamic/snv_ltpr.ma
index 07ac7b543..79ca41081 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/dynamic/snv_ltpr.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/dynamic/snv_ltpr.ma
@@ -12,184 +12,102 @@
 (*                                                                        *)
 (**************************************************************************)
 
+include "basic_2/computation/dxprs_dxprs.ma".
+include "basic_2/dynamic/snv_cpcs.ma".
 
-include "basic_2/reducibility/ltpr.ma".
-include "basic_2/computation/xprs_lift.ma".
-include "basic_2/equivalence/cpcs_cpcs.ma".
-include "basic_2/equivalence/lsubse_ssta.ma".
-include "basic_2/equivalence/fpcs_cpcs.ma".
-include "basic_2/equivalence/fpcs_fpcs.ma".
-include "basic_2/dynamic/snv_ssta.ma".
-(*
-include "basic_2/static/ssta_ltpss_dx.ma".
-include "basic_2/dynamic/snv_lift.ma".
-*)
 (* STRATIFIED NATIVE VALIDITY FOR TERMS *************************************)
 
 (* Properties on context-free parallel reduction for local environments *****)
 
-fact ssta_ltpr_tpr_aux: ∀h,g,n. (
-                           ∀L,T2. ♯{L,T2} < n →
-                           ∀T1. L ⊢ T1 ⬌* T2 → ⦃h, L⦄ ⊩ T1 :[g] → ⦃h, L⦄ ⊩ T2 :[g] →
-                           ∀U1,l1. ⦃h, L⦄ ⊢ T1 •[g, l1] U1 →
-                           ∀U2,l2. ⦃h, L⦄ ⊢ T2 •[g, l2] U2 →
-                           L ⊢ U1 ⬌* U2 ∧ l1 = l2
-                        ) → (
-                           ∀L,T. ♯{L,T} < n → ⦃h, L⦄ ⊩ T :[g] →
-                           ∀U,l. ⦃h, L⦄ ⊢ T •[g, l + 1] U → ⦃h, L⦄ ⊩ U :[g]
-                        ) → (
-                           ∀L1,T1. ♯{L1,T1} < n →
-                           ∀U1,l. ⦃h, L1⦄ ⊢ T1 •[g, l] U1 →
-                           ∀L2. L1 ➡ L2 → ∀T2. T1 ➡ T2 → ⦃h, L1⦄ ⊩ T1 :[g] → 
-                           ∃∃U2. ⦃h, L2⦄ ⊢ T2 •[g, l] U2 & ⦃L1, U1⦄ ⬌* ⦃L2, U2⦄
-                        ) →
-                        ∀L1,T1. ♯{L1,T1} = n →
-                        ∀U1,l. ⦃h, L1⦄ ⊢ T1 •[g, l] U1 →
-                        ∀L2. L1 ➡ L2 → ∀T2. T1 ➡ T2 → ⦃h, L1⦄ ⊩ T1 :[g] →
-                        ∃∃U2. ⦃h, L2⦄ ⊢ T2 •[g, l] U2 & ⦃L1, U1⦄ ⬌* ⦃L2, U2⦄.
-#h #g #n #IH3 #IH2 #IH1 #L1 * * [|||| *]
-[
-|
-|
-|
-| #V1 #T1 #Hn #Y #l #H1 #L2 #HL12 #X #H2 #H3 destruct
-  elim (ssta_inv_appl1 … H1) -H1 #U1 #HTU1 #H destruct
-  elim (snv_inv_appl … H3) -H3 #a #W1 #W10 #U10 #l0 #HV1 #HT1 #HVW1 #HW10 #HTU10
-  elim (tpr_inv_appl1 … H2) -H2 *
-  [
-  | #b #V2 #W #T2 #T20 #HV12 #HT20 #H1 #H2 destruct
-    elim (snv_inv_bind … HT1) -HT1 #HW #HT2
-    elim (ssta_inv_bind1 … HTU1) -HTU1 #U2 #HTU2 #H destruct
-    elim (xprs_fwd_abst1 … HTU10) -HTU10 #W0 #U0 #HW0 #H destruct
-    lapply (cprs_div … HW10 … HW0) -W0 #HW1
-    elim (ssta_fwd_correct … HVW1) <minus_plus_m_m #X1 #HWX1
-    elim (snv_ssta … HW) #V #l1 #HWV
-    elim (IH3 … HW1 … HW … HWX1 … HWV) -IH3 -HWX1 // [2: /2 width=5/ ] -IH2 #_ #H destruct -X1
-    elim (IH1 … HVW1 … HL12 … HV12) -HVW1 // -HV1 #W2 #HVW2 #HW12
-    elim (IH1 … HWV … HL12 W) -HWV // -HW #V0 #HWV0 #_
-    elim (IH1 … HTU2 (L2.ⓛW) … HT20 HT2) -IH1 -HTU2 -HT20 -HT2 // [2: /2 width=1/ ] #U20 #HTU20 #HU20
-    lapply (lfpr_inv_fpr L1 L2 … W) [ /2 width=1/ ] -HL12 #HL12
-    elim (lsubse_ssta_trans … HTU20 (L2.ⓓV2) ?) -HTU20
-    [ #U #HTU20 #HU20 -HWV0 -HL12 -W1 -W2
-      @(ex2_intro … (ⓓ{b}V2.U)) [ /2 width=1/ ] -h -l -l1 -V -V0 -T2 -T20 -U0
-      @(fpcs_fprs_strap2 ? L1 … (ⓓ{b}V2.U2)) [ /4 width=1/ ] -V1
-      @fpcs_shift_full -b
-      @(fpcs_canc_dx ?? (L2.ⓓV2) … U20) [2: /2 width=1/ ] -U
-    | -b -l -V -V1 -T2 -T20 -U0 -U2 -U20
-      /6 width=6 by lsubse_abbr, fpcs_inv_cpcs, fpcs_canc_sn, fpcs_fprs_strap1, cpcs_fpcs, bi_inj/
-    ]
-  ]
-|   
-(*  
-
-fact ssta_ltpr_tpr_aux: ∀h,g,L,T. (
-                           ∀L1,T1,U1,l. ⦃h, L1⦄ ⊢ T1 •[g, l] U1 →
-                           ∀L2. L1 ⊢ ⬌* L2 → ∀T2. T1 ➡ T2 → ⦃h, L1⦄ ⊩ T1 :[g] →
-                           #{L1, T1} < #{L ,T} →
-                           ∃∃U2. ⦃h, L2⦄ ⊢ T2 •[g, l] U2 & U1 ➡ U2
-                        ) →
-                        ∀L1,T1,U1,l. ⦃h, L1⦄ ⊢ T1 •[g, l] U1 →
-                        ∀L2. L1 ➡ L2 → ∀T2. T1 ➡ T2 → ⦃h, L1⦄ ⊩ T1 :[g] →
-                        L = L1 → T = T1 →
-                        ∃∃U2. ⦃h, L2⦄ ⊢ T2 •[g, l] U2 & U1 ➡ U2.
-#h #g #L #T #IH #L1 #T1 #U1 #l * -L1 -T1 -U1 -l
-[ #L1 #k #l #Hkl #L2 #_ #X #H #_ #H1 #H2 destruct -IH
-  >(tpr_inv_atom1 … H) -X /3 width=3/
-| #L1 #K1 #V1 #W1 #U1 #i #l #HLK1 #HVW1 #HWU1 #L2 #HL12 #X #H1 #H2 #H3 #H4 destruct
-  >(tpr_inv_atom1 … H1) -X
-  elim (snv_inv_lref … H2) -H2 #I0 #K0 #V0 #H #HV1
-  lapply (ldrop_mono … H … HLK1) -H #H destruct
-  lapply (ldrop_pair2_fwd_fw … HLK1 (#i)) #HKV1
-  elim (ltpr_ldrop_conf … HLK1 … HL12) -HLK1 -HL12 #X #H #HLK2
-  elim (ltpr_inv_pair1 … H) -H #K2 #V2 #HK12 #HV12 #H destruct
-  elim (IH … HVW1 K2 … HV12 ? ?) -IH -HVW1 -HV12 // -L1 -V1 /2 width=1/ -K1 #W2 #HVW2 #HW12
-  elim (lift_total W2 0 (i+1)) #U2 #HWU2
-  lapply (tpr_lift … HW12 … HWU1 … HWU2) -W1 /3 width=6/
-| #L1 #K1 #V1 #W1 #U1 #i #l #HLK1 #HVW1 #HVU1 #L2 #HL12 #X #H1 #H2 #H3 #H4 destruct
-  >(tpr_inv_atom1 … H1) -X
-  elim (snv_inv_lref … H2) -H2 #I0 #K0 #V0 #H #HV1
-  lapply (ldrop_mono … H … HLK1) -H #H destruct
-  lapply (ldrop_pair2_fwd_fw … HLK1 (#i)) #HKV1
-  elim (ltpr_ldrop_conf … HLK1 … HL12) -HLK1 -HL12 #X #H #HLK2
-  elim (ltpr_inv_pair1 … H) -H #K2 #V2 #HK12 #HV12 #H destruct
-  elim (IH … HVW1 K2 … HV12 ? ?) -IH -HVW1 // -L1 -HV1 /2 width=1/ -K1 #W2 #HVW2 #_ -W1
-  elim (lift_total V2 0 (i+1)) #U2 #HVU2
-  lapply (tpr_lift … HV12 … HVU1 … HVU2) -V1 /3 width=6/
-| #a #I #L1 #V1 #T1 #U1 #l #HTU1 #L2 #HL12 #X #H1 #H2 #H3 #H4 destruct
-  elim (snv_inv_bind … H2) -H2 #_ #HT1
-  elim (tpr_inv_bind1 … H1) -H1 *
-  [ #V2 #T0 #T2 #HV12 #HT10 #HT02 #H destruct
-    elim (IH … HTU1 (L2.ⓑ{I}V2) … HT10 ? ?) -IH -HTU1 -HT10 // -T1 /3 width=1/ -L1 #U0 #HTU0 #HU10
-    lapply (tps_lsubs_trans … HT02 (L2.ⓑ{I}V2) ?) -HT02 [ /2 width=1/ ] #HT02
-    elim (ssta_tps_conf … HTU0 … HT02) -T0 #U2 #HTU2 #HU02
-    lapply (tpss_inv_SO2 … HU02) -HU02 #HU02
-    lapply (tps_lsubs_trans … HU02 (⋆.ⓑ{I}V2) ?) -HU02
-    [ /2 width=1/ | /3 width=7/ ]
-  | #T2 #HT12 #HT2 #H1 #H2 destruct
-    elim (IH ? ? ? ? HTU1 (L2.ⓓV1) … HT12 ? ?) -IH -HTU1 -HT12 // -T1 [2: /3 width=1/ ] -L1 #U2 #HTU2 #HU12
-    elim (ssta_inv_lift1 … HTU2 … HT2) -T2 /3 width=5/
-  ]
-| #L1 #V1 #T1 #U1 #l #HTU1 #L2 #HL12 #X #H1 #H2 #H3 #H4 destruct
-  elim (snv_inv_appl … H2) -H2 #a #W1 #W10 #U10 #l0 #HV1 #HT1 #HVW1 #HW10 #HTU10
-  elim (tpr_inv_appl1 … H1) -H1 *
-  [ #V2 #T2 #HV12 #HT12 #H destruct -HV1 -HVW1 -HW10 -HTU10
-    elim (IH … HTU1 L2 … HT12 HT1 ?) -IH -HTU1 -HT12 -HT1 // [2: /2 width=1/ ] -HL12 /3 width=5/
-  | #b #V2 #W #T2 #T20 #HV12 #HT20 #H1 #H2 destruct
-    elim (snv_inv_bind … HT1) -HT1 #HW #HT2
-    elim (xprs_fwd_abst1 … HTU10) -HTU10 #W11 #U11 #HW11 #H destruct
-    elim (ssta_inv_bind1 … HTU1) -HTU1 #U2 #HTU2 #H destruct
-    elim (IH … HVW1 L2 … HV12 HV1 ?) -HVW1 -HV1 // [2: /2 width=1/ ] #W2 #HVW2 #HW12 
-    lapply (cprs_div … HW11 … HW10) -W11 #HW1
-    lapply (cpcs_cpr_strap1 … HW1 W2 ?) [ /2 width=1/ ] -W1 #HW2
-    elim (IH … HTU2 (L2.ⓛW2) … HT20 HT2 ?) -IH -HT2 -HT20 //
-    [ /5 width=7/ | /3 width=1/ ]
-  | #b #V2 #V0 #W0 #W2 #T0 #T2 #HV12 #W02 #HT02 #HV20 #H1 #H2 destruct
-    elim (snv_inv_bind … HT1) -HT1 #HW0 #HT0
-    elim (ssta_inv_bind1 … HTU1) -HTU1 #U0 #HTU0 #H destruct
-    
-    
-    elim (xprs_fwd_abst1 … HTU10) -HTU10 #W11 #U11 #HW11 #H destruct
-  
-fact snv_ltpr_tpr_aux: ∀h,g,L,T. (
-                          ∀L1,T1,U1,l. ⦃h, L1⦄ ⊢ T1 •[g, l] U1 →
-                          ∀L2. L1 ➡ L2 → ∀T2. T1 ➡ T2 → ⦃h, L1⦄ ⊩ T1 :[g] →
-                          h ⊢ ⦃L, T⦄ •⭃*[g] ⦃L1 ,T1⦄ →
-                          ∃∃U2. ⦃h, L2⦄ ⊢ T2 •[g, l] U2 & ⦃L1, U1⦄ ⬌* ⦃L2, U2⦄
-                       ) → (
-                          ∀L1,T1. ⦃h, L1⦄ ⊩ T1 :[g] →
-                          ∀L2. L1 ➡ L2 → ∀T2. ⦃h, L2⦄ ⊢ T1 •➡*[g] T2 →
-                          h ⊢ ⦃L, T⦄ •⭃*[g] ⦃L1 ,T1⦄ → ⦃h, L2⦄ ⊩ T2 :[g]
-                       ) →
-                       ∀L1,T1. ⦃h, L1⦄ ⊩ T1 :[g] →
-                       ∀L2. L1 ➡ L2 → ∀T2. T1 ➡ T2 →
-                       L = L1 → T = T1 → ⦃h, L2⦄ ⊩ T2 :[g].
-#h #g #L #T #IH2 #IH1 #L1 #T1 * -L1 -T1
-[ #L1 #k #L2 #_ #X #H #H1 #H2 destruct -IH2 -IH1 -L1
-  >(tpr_inv_atom1 … H) -X //
-| #I #L1 #K1 #V1 #i #HLK1 #HV1 #L2 #HL12 #X #H #H1 #H2 destruct -IH2
-  >(tpr_inv_atom1 … H) -X
+fact snv_ltpr_tpr_aux: ∀h,g,L0,T0.
+                       (∀L1,T1. h ⊢ ⦃L0, T0⦄ >[g] ⦃L1, T1⦄ → IH_snv_lsubsv h g L1 T1) →
+                       (∀L1,T1. h ⊢ ⦃L0, T0⦄ >[g] ⦃L1, T1⦄ → IH_ssta_ltpr_tpr h g L1 T1) →
+                       (∀L1,T1. h ⊢ ⦃L0, T0⦄ >[g] ⦃L1, T1⦄ → IH_snv_ssta h g L1 T1) →
+                       (∀L1,T1. h ⊢ ⦃L0, T0⦄ >[g] ⦃L1, T1⦄ → IH_snv_ltpr_tpr h g L1 T1) →
+                       ∀L1,T1. L0 = L1 → T0 = T1 → IH_snv_ltpr_tpr h g L1 T1.
+#h #g #L0 #T0 #IH4 #IH3 #IH2 #IH1 #L1 * * [||||*]
+[ #k #HL0 #HT0 #H1 #L2 #_ #X #H2 destruct -IH4 -IH3 -IH2 -IH1 -L1
+  >(tpr_inv_atom1 … H2) -X //
+| #i #HL0 #HT0 #H1 #L2 #HL12 #X #H2 destruct -IH4 -IH3 -IH2
+  elim (snv_inv_lref … H1) -H1 #I #K1 #V1 #HLK1 #HV1
+  >(tpr_inv_atom1 … H2) -X
   elim (ltpr_ldrop_conf … HLK1 … HL12) -HL12 #X #H #HLK2
   elim (ltpr_inv_pair1 … H) -H #K2 #V2 #HK12 #HV12 #H destruct
-  lapply (IH1 … HV1 … HK12 V2 ? ?) -IH1 -HV1 -HK12 /4 width=1/ -HV12 /3 width=4/ -HLK1 /3 width=5/
-| #a #I #L1 #V1 #T1 #HV1 #HT1 #L2 #HL12 #X #H #H1 #H2 destruct -IH2
-  elim (tpr_inv_bind1 … H) -H *
+  lapply (ldrop_pair2_fwd_fw … HLK1 (#i)) -HLK1 #HLK1
+  lapply (IH1 … HK12 … HV12) -IH1 -HV12 -HK12 // -HV1 [ /2 width=1/ ] -HLK1 /2 width=5/
+| #p #HL0 #HT0 #H1 #L2 #HL12 #X #H2 destruct -IH4 -IH3 -IH2 -IH1
+  elim (snv_inv_gref … H1)
+| #a #I #V1 #T1 #HL0 #HT0 #H1 #L2 #HL12 #X #H2 destruct -IH4 -IH3 -IH2
+  elim (snv_inv_bind … H1) -H1 #HV1 #HT1
+  elim (tpr_inv_bind1 … H2) -H2 *
   [ #V2 #T0 #T2 #HV12 #HT10 #HT02 #H destruct
     lapply (tps_lsubs_trans … HT02 (L2.ⓑ{I}V2) ?) -HT02 /2 width=1/ #HT02
-    lapply (cpr_intro (L2.ⓑ{I}V2) … T2 0 1 HT10 ?) -HT10 /2 width=1/ -HT02 #HT12
-    lapply (IH1 … HV1 … HL12 V2 ? ?) -HV1 /4 width=1/ #HV2
-    lapply (IH1 … HT1 (L2.ⓑ{I}V2) … T2 ? ?) -IH1 -HT1 /3 width=1/
+    lapply (IH1 … HL12 … HV12) // [ /2 width=1/ ] #HV2
+    lapply (snv_ltpr_cpr_aux … HT1  (L2.ⓑ{I}V2) … T2 ?) -HT1
+    [ /3 width=5 by cpr_intro, tps_tpss/ | /2 width=1/ | /3 width=1/ ] -IH1 -T0 /2 width=1/
   | #T2 #HT12 #HXT2 #H1 #H2 destruct
-    lapply (IH1 … HT1 (L2.ⓓV1) ? T2 ? ?) -IH1 -HT1 /4 width=1/ -HT12 -HL12 #HT2
+    lapply (IH1 … HT1 (L2.ⓓV1) … HT12) -IH1 -HT1 -HT12 [1,2: /2 width=1/ ] -HL12 #HT2
     lapply (snv_inv_lift … HT2 L2 … HXT2) -T2 // /2 width=1/
   ]
-| #a #L1 #V1 #W1 #W10 #T1 #U1 #l #HV1 #HT1 #HVW1 #HW10 #HTU1 #L2 #HL12 #X #H #H1 #H2 destruct
-  elim (tpr_inv_appl1 … H) -H *
-  [ #V2 #T2 #HV12 #HT12 #H destruct
-    lapply (IH1 … HV1 … HL12 V2 ? ?) /4 width=1/ #HV2
-    lapply (IH1 … HT1 … HL12 T2 ? ?) /4 width=1/ #HT2
-    lapply (IH1 … HT1 … HTU1 ?) -IH1 -HT1 // /2 width=1/ #H
-    elim (snv_inv_bind … H) -H #HW10 #HU1
-    elim (IH2 … HVW1 … HL12 … HV12 HV1 ?) -IH2 -HVW1 -HL12 -HV12 -HV1 /2 width=1/ #W2 #HVW2 #HW12
-    lapply (fpcs_canc_sn L1 L1 … W10 … HW12) -HW12 /3 width=1/ -W1 #HW102
-    @(snv_appl … HV2 HT2 HVW2)
-*)
+| #V1 #T1 #HL0 #HT0 #H1 #L2 #HL12 #X #H2 destruct
+  elim (snv_inv_appl … H1) -H1 #a #W10 #W1 #U1 #l #HV1 #HT1 #HVW1 #HW10 #HTU1
+  elim (tpr_inv_appl1 … H2) -H2 *
+  [ #V2 #T2 #HV12 #HT12 #H destruct -IH4
+    lapply (IH1 … HV1 … HL12 … HV12) [ /2 width=1/ ] #HV2
+    lapply (IH1 … HT1 … HL12 … HT12) [ /2 width=1/ ] #HT2
+    elim (IH3 … HVW1 … HL12 … HV12) -HVW1 -HV12 // -HV1 [2: /2 width=1/ ] #W2 #HVW2 #HW12
+    elim (dxprs_ltpr_cprs_aux … IH2 IH1 IH3 … HTU1 … HL12 T2) // [2: /3 width=1/ |3: /2 width=1/ ] -IH2 -IH1 -IH3 -HT1 -HT12 -HTU1 #X #HTU2 #H
+    elim (cprs_inv_abst1 Abst W1 … H) -H #W20 #U2 #HW120 #_ #H destruct
+    lapply (ltpr_cprs_conf … HL12 … HW10) -L1 #HW10
+    lapply (cpcs_cprs_strap1 … HW10 … HW120) -W1 #HW120
+    lapply (cpcs_canc_sn … HW12 HW120) -W10 #HW20
+    elim (cpcs_inv_cprs … HW20) -HW20 #W0 #HW20 #HW200
+    lapply (dxprs_cprs_trans … (ⓛ{a}W0.U2) HTU2 ?) [ /2 width=1/ ] -HW200 -HTU2 /2 width=8/
+  | #b #V2 #W20 #T20 #T2 #HV12 #HT202 #H1 #H2 destruct
+    elim (snv_inv_bind … HT1) -HT1 #HW20 #HT20
+    elim (dxprs_inv_abst1 … HTU1) -HTU1 #W30 #T30 #HW230 #_ #H destruct -T30
+    lapply (cprs_div … HW10 … HW230) -W30 #HW120
+    elim (snv_fwd_ssta … HW20) #l0 #U20 #HWU20
+    elim (ssta_fwd_correct … HVW1) <minus_plus_m_m #U10 #HWU10
+    elim (ssta_ltpr_cpcs_aux … IH1 IH3 … HW20 … HWU10 … HWU20) // -IH3 -HWU10
+    [2: /3 width=5/ |3: /2 width=1/
+    |4: /4 width=4 by ygt_yprs_trans, ypr_yprs, ypr_ssta, fw_ygt/
+    ] #H #_ -IH2 -U10 destruct
+    lapply (IH4 … HT20 (L1.ⓓV1) ?) [ /2 width=6/ | /2 width=1/ ] -U20 -W10 -l0 -IH4 -HT20 -HW20 #HT20
+    lapply (IH1 … HL12 … HV12) // [ /2 width=1/ ] #HV2
+    lapply (IH1 … HT20 … (L2.ⓓV2) … HT202) [1,2: /2 width=1/ ] -L1 -V1 -W20 -T20 /2 width=1/
+  | #b #V0 #V2 #W0 #W2 #T0 #T2 #HV10 #HW02 #HT02 #HV02 #H1 #H2 destruct -IH4
+    elim (snv_inv_bind … HT1) -HT1 #HW0 #HT0
+    elim (dxprs_inv_abbr_abst … HTU1) -HTU1 #X #HTU0 #HX #H destruct
+    elim (lift_inv_bind1 … HX) -HX #W3 #U3 #HW13 #_ #H destruct
+    lapply (ltpr_cprs_conf … HL12 … HW10) -HW10 #HW10
+    elim (dxprs_ltpr_cprs_aux … IH2 IH1 IH3 … HTU0 (L2.ⓓW2) … T2 ?) // [2: /3 width=1/ |3,4: /2 width=1/ ] -IH2 -HTU0 #X #HTU2 #H
+    elim (cprs_inv_abst1 Abst W3 … H) -H #W #U2 #HW1 #_ #H destruct -U3
+    elim (IH3 … HVW1 … HL12 … HV10) // /2 width=1/ -IH3 -HVW1 #X #H1 #H2
+    lapply (cpcs_canc_sn … H2 HW10) -W10 #H2
+    elim (lift_total X 0 1) #W20 #H3
+    lapply (ssta_lift … H1 (L2.ⓓW2) … HV02 … H3) /2 width=1/ -H1 #HVW20
+    lapply (cpcs_lift (L2.ⓓW2) … H3 … HW13 H2) /2 width=1/ -HW13 -H3 -H2 #HW320
+    lapply (cpcs_cprs_strap1 … HW320 … HW1) -W3 #HW20
+    elim (cpcs_inv_cprs … HW20) -HW20 #W3 #HW203 #HW3
+    lapply (dxprs_cprs_trans … (ⓛ{a}W3.U2) HTU2 ?) [ /2 width=1/ ] -HW3 -HTU2 #HTU2
+    lapply (IH1 … HL12 … HW02) // [ /2 width=1/ ] -HW0 #HW2
+    lapply (IH1 … HL12 … HV10) // [ /2 width=1/ ] -HV1 -HV10 #HV0
+    lapply (IH1 … HT0 … (L2.ⓓW2) … HT02) [1,2: /2 width=1/ ] -L1 -HT02 -HW02 #HT2
+    lapply (snv_lift … HV0 (L2.ⓓW2) … HV02) /2 width=1/ -HV0 -HV02 /3 width=8/
+  ]
+| #W1 #T1 #HL0 #HT0 #H1 #L2 #HL12 #X #H2 destruct -IH4 -IH2
+  elim (snv_inv_cast … H1) -H1 #U1 #l #HW1 #HT1 #HTU1 #HUW1
+  elim (tpr_inv_cast1 … H2) -H2
+  [ * #W2 #T2 #HW12 #HT12 #H destruct
+    lapply (cpcs_cprs_strap1 … HUW1 W2 ?) [ /3 width=1/ ] -HUW1 #H1
+    lapply (IH1 … HL12 … HW12) // /2 width=1/ -HW1 -HW12 #HW2
+    lapply (IH1 … HL12 … HT12) // /2 width=1/ -IH1 #HT2
+    elim (IH3 … HTU1 … HL12 … HT12) // /2 width=1/ -IH3 -HT1 -HT12 -HTU1 #U2 #HTU2 #HU12
+    lapply (ltpr_cpcs_conf … HL12 … H1) -L1 #H1
+    lapply (cpcs_canc_sn … HU12 H1) -U1 /2 width=4/
+  | #H -IH3 -HW1 -HTU1 -HUW1
+    lapply (IH1 … HL12 … H) // /2 width=1/
+  ]
+]  
+qed-.