(* Forward lemmas on lenv refinement for atomic arity assignment ************)
-lemma lsubsv_fwd_lsuba: â\88\80h,g,G,L1,L2. G â\8a¢ L1 ¡â\8a\91[h, g] L2 â\86\92 G â\8a¢ L1 â\81\9dâ\8a\91 L2.
+lemma lsubsv_fwd_lsuba: â\88\80h,g,G,L1,L2. G â\8a¢ L1 ¡â«\83[h, g] L2 â\86\92 G â\8a¢ L1 â\81\9dâ«\83 L2.
#h #g #G #L1 #L2 #H elim H -L1 -L2 // /2 width=1/
#L1 #L2 #W #V #l #H1W #HV #HVW #H2W #H1l #_ #_ #IHL12
lapply (snv_scast … HV H1W HVW H1l) -HV -H1W -HVW -H1l #HV