lemma fpbg_teqx_div:
∀G1,G2,L1,L2,T1,T. ❪G1,L1,T1❫ > ❪G2,L2,T❫ →
- â\88\80T2. T2 â\89\9b T → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
-/4 width=5 by fpbg_feqx_trans, teqx_feqx, teqx_sym/ qed-.
+ â\88\80T2. T2 â\89\85 T → ❪G1,L1,T1❫ > ❪G2,L2,T2❫.
+/4 width=5 by fpbg_feqx_trans, teqg_feqg, teqx_sym/ qed-.
(* Properties with plus-iterated structural successor for closures **********)