-lemma liftv_inv_cons1: â\88\80U1,U1s,T2s,d,e. â\87§[d, e] U1 @ U1s ≡ T2s →
- â\88\83â\88\83U2,U2s. â\87§[d, e] U1 â\89¡ U2 & â\87§[d, e] U1s ≡ U2s &
+lemma liftv_inv_cons1: â\88\80U1,U1s,T2s,d,e. â¬\86[d, e] U1 @ U1s ≡ T2s →
+ â\88\83â\88\83U2,U2s. â¬\86[d, e] U1 â\89¡ U2 & â¬\86[d, e] U1s ≡ U2s &