definition dedropable_sn: predicate (relation3 lenv term term) ≝
λR. ∀b,f,L1,K1. ⬇*[b, f] L1 ≡ K1 →
- â\88\80K2,T. K1 ⦻*[R, T] K2 → ∀U. ⬆*[f] T ≡ U →
- â\88\83â\88\83L2. L1 ⦻*[R, U] L2 & ⬇*[b, f] L2 ≡ K2 & L1 ≡[f] L2.
+ â\88\80K2,T. K1 ⪤*[R, T] K2 → ∀U. ⬆*[f] T ≡ U →
+ â\88\83â\88\83L2. L1 ⪤*[R, U] L2 & ⬇*[b, f] L2 ≡ K2 & L1 ≡[f] L2.
definition dropable_sn: predicate (relation3 lenv term term) ≝
λR. ∀b,f,L1,K1. ⬇*[b, f] L1 ≡ K1 → 𝐔⦃f⦄ →
- â\88\80L2,U. L1 ⦻*[R, U] L2 → ∀T. ⬆*[f] T ≡ U →
- â\88\83â\88\83K2. K1 ⦻*[R, T] K2 & ⬇*[b, f] L2 ≡ K2.
+ â\88\80L2,U. L1 ⪤*[R, U] L2 → ∀T. ⬆*[f] T ≡ U →
+ â\88\83â\88\83K2. K1 ⪤*[R, T] K2 & ⬇*[b, f] L2 ≡ K2.
definition dropable_dx: predicate (relation3 lenv term term) ≝
- λR. â\88\80L1,L2,U. L1 ⦻*[R, U] L2 →
+ λR. â\88\80L1,L2,U. L1 ⪤*[R, U] L2 →
∀b,f,K2. ⬇*[b, f] L2 ≡ K2 → 𝐔⦃f⦄ → ∀T. ⬆*[f] T ≡ U →
- â\88\83â\88\83K1. â¬\87*[b, f] L1 â\89¡ K1 & K1 ⦻*[R, T] K2.
+ â\88\83â\88\83K1. â¬\87*[b, f] L1 â\89¡ K1 & K1 ⪤*[R, T] K2.
(* Properties with generic slicing for local environments *******************)
qed-.
(* Basic_2A1: was: llpx_sn_inv_lift_O *)
-lemma lfxs_inv_lifts_bi: â\88\80R,L1,L2,U. L1 ⦻*[R, U] L2 →
+lemma lfxs_inv_lifts_bi: â\88\80R,L1,L2,U. L1 ⪤*[R, U] L2 →
∀K1,K2,i. ⬇*[i] L1 ≡ K1 → ⬇*[i] L2 ≡ K2 →
- â\88\80T. â¬\86*[i] T â\89¡ U â\86\92 K1 ⦻*[R, T] K2.
+ â\88\80T. â¬\86*[i] T â\89¡ U â\86\92 K1 ⪤*[R, T] K2.
#R #L1 #L2 #U #HL12 #K1 #K2 #i #HLK1 #HLK2 #T #HTU
elim (lfxs_dropable_sn … HLK1 … HL12 … HTU) -L1 -U // #Y #HK12 #HY
lapply (drops_mono … HY … HLK2) -L2 -i #H destruct //
qed-.
-lemma lfxs_inv_lref_sn: â\88\80R,L1,L2,i. L1 ⦻*[R, #i] L2 → ∀I,K1,V1. ⬇*[i] L1 ≡ K1.ⓑ{I}V1 →
- â\88\83â\88\83K2,V2. â¬\87*[i] L2 â\89¡ K2.â\93\91{I}V2 & K1 ⦻*[R, V1] K2 & R K1 V1 V2.
+lemma lfxs_inv_lref_sn: â\88\80R,L1,L2,i. L1 ⪤*[R, #i] L2 → ∀I,K1,V1. ⬇*[i] L1 ≡ K1.ⓑ{I}V1 →
+ â\88\83â\88\83K2,V2. â¬\87*[i] L2 â\89¡ K2.â\93\91{I}V2 & K1 ⪤*[R, V1] K2 & R K1 V1 V2.
#R #L1 #L2 #i #HL12 #I #K1 #V1 #HLK1 elim (lfxs_dropable_sn … HLK1 … HL12 (#0)) -HLK1 -HL12 //
#Y #HY #HLK2 elim (lfxs_inv_zero_pair_sn … HY) -HY
#K2 #V2 #HK12 #HV12 #H destruct /2 width=5 by ex3_2_intro/
qed-.
-lemma lfxs_inv_lref_dx: â\88\80R,L1,L2,i. L1 ⦻*[R, #i] L2 → ∀I,K2,V2. ⬇*[i] L2 ≡ K2.ⓑ{I}V2 →
- â\88\83â\88\83K1,V1. â¬\87*[i] L1 â\89¡ K1.â\93\91{I}V1 & K1 ⦻*[R, V1] K2 & R K1 V1 V2.
+lemma lfxs_inv_lref_dx: â\88\80R,L1,L2,i. L1 ⪤*[R, #i] L2 → ∀I,K2,V2. ⬇*[i] L2 ≡ K2.ⓑ{I}V2 →
+ â\88\83â\88\83K1,V1. â¬\87*[i] L1 â\89¡ K1.â\93\91{I}V1 & K1 ⪤*[R, V1] K2 & R K1 V1 V2.
#R #L1 #L2 #i #HL12 #I #K2 #V2 #HLK2 elim (lfxs_dropable_dx … HL12 … HLK2 … (#0)) -HLK2 -HL12 //
#Y #HLK1 #HY elim (lfxs_inv_zero_pair_dx … HY) -HY
#K1 #V1 #HK12 #HV12 #H destruct /2 width=5 by ex3_2_intro/