-theorem fsubst_inv_delift: â\88\80K,V,T1,L,T2,d. â\86\93[0, d] L â\89¡ K. ð\9d\95\93{Abbr} V â\86\92
- L â\8a¢ T1 [d, 1] â\89¡ T2 â\86\92 â\86¡[d ← V] T1 = T2.
+theorem fsubst_inv_delift: â\88\80K,V,T1,L,T2,d. â\87\93[0, d] L â\89¡ K. ð\9d\95\93{Abbr} V â\86\92
+ L â\8a¢ T1 [d, 1] â\89¡ T2 â\86\92 â\86\93[d ← V] T1 = T2.