(* Basic_1: uses: ty3_sn3 *)
(* Basic_2A1: uses: nta_fwd_csn *)
theorem nta_fwd_fsb (h) (a) (G) (L):
- â\88\80T,U. â¦\83G,Lâ¦\84 ⊢ T :[h,a] U →
- ∧∧ ≥[h] 𝐒⦃G,L,T⦄ & ≥[h] 𝐒⦃G,L,U⦄.
+ â\88\80T,U. â\9dªG,Lâ\9d« ⊢ T :[h,a] U →
+ ∧∧ ≥𝐒 ❪G,L,T❫ & ≥𝐒 ❪G,L,U❫.
#h #a #G #L #T #U #H
elim (cnv_inv_cast … H) #X #HU #HT #_ #_ -X
-/3 width=2 by cnv_fwd_fsb, conj/
+/3 width=3 by cnv_fwd_fsb, conj/
qed-.