-definition S7 ≝ λC:lenv→predicate term. ∀L1,L2,T1,T2,d,e.
- C L1 T1 → ⇩[d, e] L2 ≡ L1 → ⇧[d, e] T1 ≡ T2 → C L2 T2.
+definition S7 ≝ λC:lenv→predicate term. ∀L2,L1,T1,d,e.
+ C L1 T1 â\86\92 â\88\80T2. â\87©[d, e] L2 â\89¡ L1 â\86\92 â\87§[d, e] T1 â\89¡ T2 â\86\92 C L2 T2.