+++ /dev/null
-(**************************************************************************)
-(* ___ *)
-(* ||M|| *)
-(* ||A|| A project by Andrea Asperti *)
-(* ||T|| *)
-(* ||I|| Developers: *)
-(* ||T|| The HELM team. *)
-(* ||A|| http://helm.cs.unibo.it *)
-(* \ / *)
-(* \ / This file is distributed under the terms of the *)
-(* v GNU General Public License Version 2 *)
-(* *)
-(**************************************************************************)
-
-include "delayed_updating/reduction/dfr.ma".
-include "delayed_updating/reduction/ifr.ma".
-
-include "delayed_updating/unwind/unwind2_constructors.ma".
-include "delayed_updating/unwind/unwind2_preterm_fsubst.ma".
-include "delayed_updating/unwind/unwind2_preterm_eq.ma".
-include "delayed_updating/unwind/unwind2_prototerm_lift.ma".
-include "delayed_updating/unwind/unwind2_rmap_closed.ma".
-
-include "delayed_updating/substitution/fsubst_eq.ma".
-include "delayed_updating/substitution/lift_prototerm_eq.ma".
-
-include "delayed_updating/syntax/prototerm_proper_constructors.ma".
-include "delayed_updating/syntax/path_closed_structure.ma".
-include "delayed_updating/syntax/path_structure_depth.ma".
-
-(* DELAYED FOCUSED REDUCTION ************************************************)
-
-(* Main destructions with ifr ***********************************************)
-
-theorem dfr_des_ifr (f) (t1) (t2) (r): t1 Ο΅ π β
- t1 β‘ππ[r] t2 β βΌ[f]t1 β‘π’π[βr] βΌ[f]t2.
-#f #t1 #t2 #r #H0t1
-* #p #q #n #Hr #Hn #Ht1 #Ht2 destruct
-@(ex4_3_intro β¦ (βp) (βq) (βq))
-[ -H0t1 -Hn -Ht1 -Ht2 //
-| -H0t1 -Ht1 -Ht2
- /2 width=2 by path_closed_structure_depth/
-| lapply (in_comp_unwind2_path_term f β¦ Ht1) -Ht2 -Ht1 -H0t1
- <unwind2_path_d_dx <tr_pap_succ_nap <list_append_rcons_sn
- <nap_unwind2_rmap_append_closed_Lq_dx_depth //
-| lapply (unwind2_term_eq_repl_dx f β¦ Ht2) -Ht2 #Ht2
- @(subset_eq_trans β¦ Ht2) -t2
- @(subset_eq_trans β¦ (unwind2_term_fsubst_ppc β¦))
- [ @fsubst_eq_repl [ // | // ]
- @(subset_eq_trans β¦ (unwind2_term_irefβ¦))
- @(subset_eq_canc_sn β¦ (lift_term_eq_repl_dx β¦))
- [ @unwind2_term_grafted_S /2 width=2 by ex_intro/ | skip ] -Ht1
- @(subset_eq_trans β¦ (lift_unwind2_term_after β¦))
- @unwind2_term_eq_repl_sn
-(* Note: crux of the proof begins *)
- <list_append_rcons_sn
- @(stream_eq_trans β¦ (tr_compose_uni_dx_pap β¦)) <tr_pap_succ_nap
- @tr_compose_eq_repl
- [ <nap_unwind2_rmap_append_closed_Lq_dx_depth //
- | /2 width=2 by tls_succ_unwind2_rmap_append_closed_Lq_dx/
- ]
-(* Note: crux of the proof ends *)
- | //
- | /2 width=2 by ex_intro/
- | //
- ]
-]
-qed.