-lemma lsubd_drop_O1_trans: â\88\80h,g,G,L1,L2. G â\8a¢ L1 â\96ªâ«\83[h, g] L2 →
- â\88\80K2,s,e. â\87©[s, 0, e] L2 ≡ K2 →
- â\88\83â\88\83K1. G â\8a¢ K1 â\96ªâ«\83[h, g] K2 & â\87©[s, 0, e] L1 ≡ K1.
+lemma lsubd_drop_O1_trans: â\88\80h,g,G,L1,L2. G â\8a¢ L1 â«\83â\96ª[h, g] L2 →
+ â\88\80K2,s,e. â¬\87[s, 0, e] L2 ≡ K2 →
+ â\88\83â\88\83K1. G â\8a¢ K1 â«\83â\96ª[h, g] K2 & â¬\87[s, 0, e] L1 ≡ K1.