-lemma lsubd_inv_pair1: â\88\80h,g,I,G,K1,L2,X. G â\8a¢ K1.â\93\91{I}X â\96ªâ«\83[h, g] L2 →
- (â\88\83â\88\83K2. G â\8a¢ K1 â\96ªâ«\83[h, g] K2 & L2 = K2.ⓑ{I}X) ∨
+lemma lsubd_inv_pair1: â\88\80h,g,I,G,K1,L2,X. G â\8a¢ K1.â\93\91{I}X â«\83â\96ª[h, g] L2 →
+ (â\88\83â\88\83K2. G â\8a¢ K1 â«\83â\96ª[h, g] K2 & L2 = K2.ⓑ{I}X) ∨