/3 width=6 by tdeq_inv_lifts_sn, deliftable2_sn_bi/ qed-.
lemma tdeq_lifts_inv_pair_sn (I) (f:rtmap):
- â\88\80X,T. â¬\86*[f]X ≘ T → ∀V. ②{I}V.T ≛ X → ⊥.
+ â\88\80X,T. â\87§*[f]X ≘ T → ∀V. ②{I}V.T ≛ X → ⊥.
#I #f #X #T #H elim H -f -X -T
[ #f #s #V #H
elim (tdeq_inv_pair1 … H) -H #X1 #X2 #_ #_ #H destruct