(* Main properties **********************************************************)
-theorem lsuba_trans: ∀L1,L. L1 ÷⊑ L → ∀L2. L ÷⊑ L2 → L1 ÷⊑ L2.
+theorem lsuba_trans: ∀L1,L. L1 ⁝⊑ L → ∀L2. L ⁝⊑ L2 → L1 ⁝⊑ L2.
#L1 #L #H elim H -L1 -L
[ #X #H >(lsuba_inv_atom1 … H) -H //
| #I #L1 #L #V #HL1 #IHL1 #X #H