lemma lsubd_da_trans: ∀h,g,G,L2,T,d. ⦃G, L2⦄ ⊢ T ▪[h, g] d →
∀L1. G ⊢ L1 ⫃▪[h, g] L2 → ⦃G, L1⦄ ⊢ T ▪[h, g] d.
#h #g #G #L2 #T #d #H elim H -G -L2 -T -d
lemma lsubd_da_trans: ∀h,g,G,L2,T,d. ⦃G, L2⦄ ⊢ T ▪[h, g] d →
∀L1. G ⊢ L1 ⫃▪[h, g] L2 → ⦃G, L1⦄ ⊢ T ▪[h, g] d.
#h #g #G #L2 #T #d #H elim H -G -L2 -T -d
| #G #L2 #K2 #V #i #d #HLK2 #_ #IHV #L1 #HL12
elim (lsubd_drop_O1_trans … HL12 … HLK2) -L2 #X #H #HLK1
elim (lsubd_inv_pair2 … H) -H * #K1 [ | -IHV -HLK1 ]
| #G #L2 #K2 #V #i #d #HLK2 #_ #IHV #L1 #HL12
elim (lsubd_drop_O1_trans … HL12 … HLK2) -L2 #X #H #HLK1
elim (lsubd_inv_pair2 … H) -H * #K1 [ | -IHV -HLK1 ]
| #W #d0 #_ #_ #_ #H destruct
]
| #G #L2 #K2 #W #i #d #HLK2 #HW #IHW #L1 #HL12
elim (lsubd_drop_O1_trans … HL12 … HLK2) -L2 #X #H #HLK1
elim (lsubd_inv_pair2 … H) -H * #K1 [ -HW | -IHW ]
| #W #d0 #_ #_ #_ #H destruct
]
| #G #L2 #K2 #W #i #d #HLK2 #HW #IHW #L1 #HL12
elim (lsubd_drop_O1_trans … HL12 … HLK2) -L2 #X #H #HLK1
elim (lsubd_inv_pair2 … H) -H * #K1 [ -HW | -IHW ]
]
qed-.
lemma lsubd_da_conf: ∀h,g,G,L1,T,d. ⦃G, L1⦄ ⊢ T ▪[h, g] d →
∀L2. G ⊢ L1 ⫃▪[h, g] L2 → ⦃G, L2⦄ ⊢ T ▪[h, g] d.
#h #g #G #L1 #T #d #H elim H -G -L1 -T -d
]
qed-.
lemma lsubd_da_conf: ∀h,g,G,L1,T,d. ⦃G, L1⦄ ⊢ T ▪[h, g] d →
∀L2. G ⊢ L1 ⫃▪[h, g] L2 → ⦃G, L2⦄ ⊢ T ▪[h, g] d.
#h #g #G #L1 #T #d #H elim H -G -L1 -T -d
| #G #L1 #K1 #V #i #d #HLK1 #HV #IHV #L2 #HL12
elim (lsubd_drop_O1_conf … HL12 … HLK1) -L1 #X #H #HLK2
elim (lsubd_inv_pair1 … H) -H * #K2 [ -HV | -IHV ]
| #G #L1 #K1 #V #i #d #HLK1 #HV #IHV #L2 #HL12
elim (lsubd_drop_O1_conf … HL12 … HLK1) -L1 #X #H #HLK2
elim (lsubd_inv_pair1 … H) -H * #K2 [ -HV | -IHV ]
]
| #G #L1 #K1 #W #i #d #HLK1 #HW #IHW #L2 #HL12
elim (lsubd_drop_O1_conf … HL12 … HLK1) -L1 #X #H #HLK2
elim (lsubd_inv_pair1 … H) -H * #K2 [ -HW | -IHW ]
]
| #G #L1 #K1 #W #i #d #HLK1 #HW #IHW #L2 #HL12
elim (lsubd_drop_O1_conf … HL12 … HLK1) -L1 #X #H #HLK2
elim (lsubd_inv_pair1 … H) -H * #K2 [ -HW | -IHW ]