(* Basic_2A1: includes: lreq_drop_trans_be *)
lemma lreq_drops_trans_next: ∀f2,L1,L2. L1 ≡[f2] L2 →
- ∀b,f,I,K2. ⬇*[b, f] L2 ≡ K2.ⓘ{I} → 𝐔⦃f⦄ →
- ∀f1. f ~⊚ ⫯f1 ≡ f2 →
- ∃∃K1. ⬇*[b, f] L1 ≡ K1.ⓘ{I} & K1 ≡[f1] K2.
-#f2 #L1 #L2 #HL12 #b #f #I #K1 #HLK1 #Hf #f1 #Hf2
-elim (lexs_drops_trans_next … HL12 … HLK1 Hf … Hf2) -f2 -L2 -Hf
+ ∀b,f,I,K2. ⬇*[b, f] L2 ≘ K2.ⓘ{I} → 𝐔⦃f⦄ →
+ ∀f1. f ~⊚ ↑f1 ≘ f2 →
+ ∃∃K1. ⬇*[b, f] L1 ≘ K1.ⓘ{I} & K1 ≡[f1] K2.
+#f2 #L1 #L2 #HL12 #b #f #I2 #K2 #HLK2 #Hf #f1 #Hf2
+elim (lexs_drops_trans_next … HL12 … HLK2 Hf … Hf2) -f2 -L2 -Hf
+#I1 #K1 #HLK1 #HK12 #H <(ceq_ext_inv_eq … H) -I2
/2 width=3 by ex2_intro/
qed-.
(* Basic_2A1: includes: lreq_drop_conf_be *)
lemma lreq_drops_conf_next: ∀f2,L1,L2. L1 ≡[f2] L2 →
- â\88\80b,f,I,K1. â¬\87*[b, f] L1 â\89¡ K1.ⓘ{I} → 𝐔⦃f⦄ →
- â\88\80f1. f ~â\8a\9a ⫯f1 â\89¡ f2 →
- â\88\83â\88\83K2. â¬\87*[b, f] L2 â\89¡ K2.ⓘ{I} & K1 ≡[f1] K2.
-#f2 #L1 #L2 #HL12 #b #f #I #K1 #HLK1 #Hf #f1 #Hf2
+ â\88\80b,f,I,K1. â¬\87*[b, f] L1 â\89\98 K1.ⓘ{I} → 𝐔⦃f⦄ →
+ â\88\80f1. f ~â\8a\9a â\86\91f1 â\89\98 f2 →
+ â\88\83â\88\83K2. â¬\87*[b, f] L2 â\89\98 K2.ⓘ{I} & K1 ≡[f1] K2.
+#f2 #L1 #L2 #HL12 #b #f #I1 #K1 #HLK1 #Hf #f1 #Hf2
elim (lreq_drops_trans_next … (lreq_sym … HL12) … HLK1 … Hf2) // -f2 -L1 -Hf
/3 width=3 by lreq_sym, ex2_intro/
qed-.
lemma drops_lreq_trans_next: ∀f1,K1,K2. K1 ≡[f1] K2 →
- â\88\80b,f,I,L1. â¬\87*[b, f] L1.â\93\98{I} â\89¡ K1 →
- â\88\80f2. f ~â\8a\9a f1 â\89¡ ⫯f2 →
- â\88\83â\88\83L2. â¬\87*[b, f] L2.â\93\98{I} â\89¡ K2 & L1 ≡[f2] L2 & L1.ⓘ{I} ≡[f] L2.ⓘ{I}.
-#f1 #K1 #K2 #HK12 #b #f #I #L1 #HLK1 #f2 #Hf2
+ â\88\80b,f,I,L1. â¬\87*[b, f] L1.â\93\98{I} â\89\98 K1 →
+ â\88\80f2. f ~â\8a\9a f1 â\89\98 â\86\91f2 →
+ â\88\83â\88\83L2. â¬\87*[b, f] L2.â\93\98{I} â\89\98 K2 & L1 ≡[f2] L2 & L1.ⓘ{I} ≡[f] L2.ⓘ{I}.
+#f1 #K1 #K2 #HK12 #b #f #I1 #L1 #HLK1 #f2 #Hf2
elim (drops_lexs_trans_next … HK12 … HLK1 … Hf2) -f1 -K1
-/2 width=6 by cfull_lift_sn, ceq_lift_sn, ex3_intro/ qed-.
+/2 width=6 by cfull_lift_sn, ceq_lift_sn/
+#I2 #L2 #HLK2 #HL12 #H >(ceq_ext_inv_eq … H) -I1
+/2 width=4 by ex3_intro/
+qed-.