(* Main properties **********************************************************)
-theorem lsuba_trans: â\88\80G,L1,L. G â\8a¢ L1 â\81\9dâ\8a\91 L â\86\92 â\88\80L2. G â\8a¢ L â\81\9dâ\8a\91 L2 â\86\92 G â\8a¢ L1 â\81\9dâ\8a\91 L2.
+theorem lsuba_trans: â\88\80G,L1,L. G â\8a¢ L1 â\81\9dâ«\83 L â\86\92 â\88\80L2. G â\8a¢ L â\81\9dâ«\83 L2 â\86\92 G â\8a¢ L1 â\81\9dâ«\83 L2.
#G #L1 #L #H elim H -L1 -L
[ #X #H >(lsuba_inv_atom1 … H) -H //
| #I #L1 #L #Y #HL1 #IHL1 #X #H