-lemma fqu_cpx_trans: ∀h,G1,G2,L1,L2,T1,T2. ⦃G1, L1, T1⦄ ⊐ ⦃G2, L2, T2⦄ →
- â\88\80U2. â¦\83G2, L2â¦\84 ⊢ T2 ⬈[h] U2 →
- â\88\83â\88\83U1. â¦\83G1, L1â¦\84 â\8a¢ T1 â¬\88[h] U1 & â¦\83G1, L1, U1â¦\84 â\8a\90 â¦\83G2, L2, U2â¦\84.
-#h #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
-/3 width=3 by fqu_pair_sn, fqu_bind_dx, fqu_flat_dx, cpx_pair_sn, cpx_bind, cpx_flat, ex2_intro/
+lemma fqu_cpx_trans: ∀h,b,G1,G2,L1,L2,T1,T2. ❪G1,L1,T1❫ ⬂[b] ❪G2,L2,T2❫ →
+ â\88\80U2. â\9dªG2,L2â\9d« ⊢ T2 ⬈[h] U2 →
+ â\88\83â\88\83U1. â\9dªG1,L1â\9d« â\8a¢ T1 â¬\88[h] U1 & â\9dªG1,L1,U1â\9d« â¬\82[b] â\9dªG2,L2,U2â\9d«.
+#h #b #G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
+/3 width=3 by cpx_pair_sn, cpx_bind, cpx_flat, fqu_pair_sn, fqu_bind_dx, fqu_flat_dx, ex2_intro/