qed-.
lemma tweq_inv_abbr_pos_x_lifts_y_y (T) (f:rtmap):
- â\88\80V,U. +â\93\93V.U â\89\85 T â\86\92 â¬\86*[f]T ≘ U → ⊥.
+ â\88\80V,U. +â\93\93V.U â\89\85 T â\86\92 â\87§*[f]T ≘ U → ⊥.
@(f_ind … tw) #n #IH #T #Hn #f #V #U #H1 #H2 destruct
elim (tweq_inv_abbr_pos_sn … H1) -H1 #X1 #X2 #HX2 #H destruct -V
elim (lifts_inv_bind1 … H2) -H2 #Y1 #Y2 #_ #HXY2 #H destruct