milestone update in ground_2 and basic_2A

[helm.git] / matita / matita / contribs / lambdadelta / basic_2A / etc / lsubr / snv_lpss.etc

diff --git a/matita/matita/contribs/lambdadelta/basic_2A/etc/lsubr/snv_lpss.etc b/matita/matita/contribs/lambdadelta/basic_2A/etc/lsubr/snv_lpss.etc
new file mode 100644 (file)
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+include "basic_2/computation/dxprs_lpss.ma".
+include "basic_2/equivalence/cpcs_lpss.ma".
+include "basic_2/dynamic/snv_lift.ma".
+
+(* STRATIFIED NATIVE VALIDITY FOR TERMS *************************************)
+
+(* Properties about sn parallel substitution for local environments *********)
+
+lemma snv_cpss_lpss_conf: ∀h,g,L1,T1. ⦃h, L1⦄ ⊢ T1 ¡[g] → ∀T2. L1 ⊢ T1 ▶* T2 →
+                          ∀L2. L1 ⊢ ▶* L2 → ⦃h, L2⦄ ⊢ T2 ¡[g].
+#h #g #L1 #T1 #H elim H -L1 -T1
+[ #L1 #k #X #H #L2 #_
+   >(cpss_inv_sort1 … H) -X //
+| #I #L1 #K1 #V1 #i #HLK1 #_ #IHV1 #W2 #H #L2 #HL12
+  elim (cpss_inv_lref1 … H) -H
+  [ #H destruct
+    elim (lpss_ldrop_conf … HLK1 … HL12) -L1 #X #H #HLK2
+    elim (lpss_inv_pair1 … H) -H #K2 #V2 #HK12 #HV12 #H destruct
+    lapply (IHV1 … HV12 … HK12) -IHV1 -HV12 -HK12 /2 width=5/
+  | * #K0 #V0 #V2 #HLK0 #HV12 #HVW2
+    lapply (ldrop_mono … HLK0 … HLK1) -HLK0 #H destruct
+    elim (lpss_ldrop_conf … HLK1 … HL12) -L1 #X #H #HLK2
+    elim (lpss_inv_pair1 … H) -H #K2 #V #HK12 #_ #H destruct
+    lapply (ldrop_fwd_ldrop2 … HLK2) -V #HLK2
+    lapply (IHV1 … HV12 … HK12) -IHV1 -HV12 -HK12 /2 width=7/
+  ]
+| #a #I #L1 #V1 #T1 #_ #_ #IHV1 #IHT1 #X #H #L2 #HL12
+  elim (cpss_inv_bind1 … H) -H #V2 #T2 #HV12 #HT12 #H destruct
+  lapply (IHV1 … HV12 … HL12) -IHV1 #HV2
+  lapply (IHT1 … HT12 (L2.ⓑ{I}V2) ?) -IHT1 -HT12 /2 width=1/
+| #a #L1 #V1 #W1 #W0 #T1 #U1 #l #_ #_ #HVW1 #HW10 #HTU1 #IHV1 #IHT1 #X #H #L2 #HL12
+  elim (cpss_inv_flat1 … H) -H #V2 #T2 #HV12 #HT12 #H destruct
+  lapply (IHV1 … HV12 … HL12) -IHV1 #HV2
+  lapply (IHT1 … HT12 … HL12) -IHT1 #HT2
+  elim (ssta_cpss_lpss_conf … HVW1 … HV12 … HL12) -V1 #W2 #HVW2 #HW12
+  elim (dxprs_cpss_lpss_conf … HTU1 … HT12 … HL12) -T1 #X #HTU2 #H
+  elim (cpss_inv_bind1 … H) -H #W #U2 #HW0 #_ #H -U1 destruct
+  elim (cprs_cpss2_lpss_conf_dx … HW10 … HW12 … HW0 … HL12) -L1 -W1 -W0 #W0 #HW20 #HW0
+  lapply (dxprs_strap1 … (ⓛ{a}W0.U2) HTU2 ?) -HTU2 /3 width=3/ -HW0 /2 width=8/
+| #L1 #W1 #T1 #U1 #l #_ #_ #HTU1 #HUW1 #IHW1 #IHT1 #X #H #L2 #HL12
+  elim (cpss_inv_flat1 … H) -H #W2 #T2 #HW12 #HT12 #H destruct
+  lapply (IHW1 … HW12 … HL12) -IHW1 #HW2
+  lapply (IHT1 … HT12 … HL12) -IHT1 #HT2
+  elim (ssta_cpss_lpss_conf … HTU1 … HT12 … HL12) -T1 #U2 #HTU2 #HU12
+  lapply (cpcs_cpss2_lpss_conf … HUW1 … HU12 … HW12 … HL12) -L1 -W1 -U1 /2 width=4/
+]
+qed-.
+
+lemma snv_lpss_conf: ∀h,g,L1,T. ⦃h, L1⦄ ⊢ T ¡[g] →
+                     ∀L2. L1 ⊢ ▶* L2 → ⦃h, L2⦄ ⊢ T ¡[g].
+#h #g #L1 #T #HT #L2 #HL12
+@(snv_cpss_lpss_conf … HT … HL12) //
+qed-.
+
+lemma snv_cpss_conf: ∀h,g,L,T1. ⦃h, L⦄ ⊢ T1 ¡[g] →
+                     ∀T2. L ⊢ T1 ▶* T2 → ⦃h, L⦄ ⊢ T2 ¡[g].
+#h #g #L #T1 #HT1 #T2 #HT12
+@(snv_cpss_lpss_conf … HT1 … HT12) //
+qed-.