-lemma fpr_lfpra: ∀L1,T1,L2,T2. ⦃L1, T1⦄ ➡ ⦃L2, T2⦄ → ⦃L1⦄ ➡➡ ⦃L2⦄.
-#L1 #T1 @(cw_wf_ind … L1 T1) -L1 -T1 *
-[ #T1 #_ #L2 #T2 #H
- elim (fpr_inv_atom1 … H) -H #_ #H destruct //
-| #L1 #I #V1 #T1 #IH #Y #X #H
- elim (fpr_inv_pair1 … H) -H #L2 #V2 #HL12 #H destruct
- @lpx_bi_pair
- [ @(IH … HL12)
- | @IH
-
- /3 width=4/
-
-lemma fpr_lfpra: ∀L1,L2,T1,T2. ⦃L1, T1⦄ ➡ ⦃L2, T2⦄ → ⦃L1⦄ ➡➡ ⦃L2⦄.
-#L1 elim L1 -L1
-[ #L2 #T1 #T2 #H
- elim (fpr_inv_atom1 … H) -H #_ #H destruct //
-| #L1 #I #V1 #IH #L2 #T1 #T2 #H
- elim (fpr_inv_pair1 … H) -H #L #V #HL1 #H destruct
- @lpx_bi_pair /2 width=3/
-
- /4 width=3/
-
-(*
-include "basic_2/reducibility/lcpr.ma".
-
-lemma lcpr_pair2: ∀L1,L2. L1 ⊢ ➡ L2 → ∀V1,V2. ⦃L1, V1⦄ ➡ ⦃L2, V2⦄ →
- ∀I. L1. ⓑ{I} V1 ⊢ ➡ L2. ⓑ{I} V2.
-#L1 #L2 * #L #HL1 #HL2 #V1 #V2 *
-#H1 #H2 #I
-@(ex2_1_intro … (L.ⓑ{I}V1)) /2 width=1/
-@tpss_
-
-(*
-<(ltpss_fwd_length … HL2) /4 width=5/