-lemma lsubd_inv_pair1: â\88\80h,g,I,G,K1,L2,X. G â\8a¢ K1.â\93\91{I}X â\96ªâ\8a\91[h, g] L2 →
- (â\88\83â\88\83K2. G â\8a¢ K1 â\96ªâ\8a\91[h, g] K2 & L2 = K2.ⓑ{I}X) ∨
- ∃∃K2,W,V,l. ⦃G, K1⦄ ⊢ V ▪[h, g] l+1 & ⦃G, K2⦄ ⊢ W ▪[h, g] l &
- G â\8a¢ K1 â\96ªâ\8a\91[h, g] K2 &
+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) ∨
+ ∃∃K2,W,V,d. ⦃G, K1⦄ ⊢ V ▪[h, g] d+1 & ⦃G, K2⦄ ⊢ W ▪[h, g] d &
+ G â\8a¢ K1 â«\83â\96ª[h, g] K2 &