-lemma ltpr_ldrop_trans: â\88\80L1,K1,d,e. â\86\93[d, e] L1 â\89¡ K1 â\86\92 â\88\80K2. K1 â\87\92 K2 →
- â\88\83â\88\83L2. â\86\93[d, e] L2 â\89¡ K2 & L1 â\87\92 L2.
+lemma ltpr_ldrop_trans: â\88\80L1,K1,d,e. â\87©[d, e] L1 â\89¡ K1 â\86\92 â\88\80K2. K1 â\9e¡ K2 →
+ â\88\83â\88\83L2. â\87©[d, e] L2 â\89¡ K2 & L1 â\9e¡ L2.