/2 width=5 by rex_dropable_dx/ qed-.
lemma rpx_inv_lifts_bi (G):
- â\88\80L1,L2,U. â\9dªG,L1â\9d« â\8a¢ â¬\88[U] L2 â\86\92 â\88\80b,f. ð\9d\90\94â\9dªfâ\9d« →
+ â\88\80L1,L2,U. â\9d¨G,L1â\9d© â\8a¢ â¬\88[U] L2 â\86\92 â\88\80b,f. ð\9d\90\94â\9d¨fâ\9d© →
∀K1,K2. ⇩*[b,f] L1 ≘ K1 → ⇩*[b,f] L2 ≘ K2 →
- â\88\80T. â\87§*[f]T â\89\98 U â\86\92 â\9dªG,K1â\9d« ⊢ ⬈[T] K2.
+ â\88\80T. â\87§*[f]T â\89\98 U â\86\92 â\9d¨G,K1â\9d© ⊢ ⬈[T] K2.
/2 width=10 by rex_inv_lifts_bi/ qed-.