-fact gdrop_inv_lt_aux: â\88\80I,G,G1,G2,V,e. â\87\93[e] G â\89¡ G2 â\86\92 G = G1. ð\9d\95\93{I} V →
- e < |G1| â\86\92 â\87\93[e] G1 ≡ G2.
+fact gdrop_inv_lt_aux: â\88\80I,G,G1,G2,V,e. â\87©[e] G â\89¡ G2 â\86\92 G = G1. â\93\91{I} V →
+ e < |G1| â\86\92 â\87©[e] G1 ≡ G2.