-lemma cpcs_inv_lift: ∀G,L,K,s,d,e. ⇩[s, d, e] L ≡ K →
- â\88\80T1,U1. â\87§[d, e] T1 â\89¡ U1 â\86\92 â\88\80T2,U2. â\87§[d, e] T2 ≡ U2 →
+lemma cpcs_inv_lift: ∀G,L,K,s,l,m. ⬇[s, l, m] L ≡ K →
+ â\88\80T1,U1. â¬\86[l, m] T1 â\89¡ U1 â\86\92 â\88\80T2,U2. â¬\86[l, m] T2 ≡ U2 →