(* LAZY EQUIVALENCE FOR LOCAL ENVIRONMENTS **********************************)
-(* Properties on poinwise union for local environments **********************)
+(* Properties on pointwise union for local environments **********************)
lemma llpx_sn_llor_dx: ∀R. (s_r_confluent1 … R (llpx_sn R 0)) → (frees_trans R) →
∀L1,L2,T,d. llpx_sn R d T L1 L2 → ∀L. L1 ⩖[T, d] L2 ≡ L → L2 ≡[T, d] L.
elim (llpx_sn_llpx_sn_alt … H1) -H1 #HL12 #IH1
elim H2 -H2 #_ #HL1 #IH2
@lleq_intro_alt // #I2 #I #K2 #K #V2 #V #i #Hi #HnT #HLK2 #HLK
-lapply (ldrop_fwd_length_lt2 … HLK) #HiL
-elim (ldrop_O1_lt (Ⓕ) L1 i) // -HiL #I1 #K1 #V1 #HLK1
+lapply (drop_fwd_length_lt2 … HLK) #HiL
+elim (drop_O1_lt (Ⓕ) L1 i) // -HiL #I1 #K1 #V1 #HLK1
elim (IH1 … HLK1 HLK2) -IH1 /2 width=1 by/ #H #_ destruct
elim (IH2 … HLK1 HLK2 HLK) -IH2 -HLK1 -HLK2 -HLK * /2 width=1 by conj/ #H
[ elim (ylt_yle_false … H) -H //