include "delayed_updating/unwind/unwind2_rmap_head.ma".
include "delayed_updating/substitution/fsubst_eq.ma".
-include "delayed_updating/substitution/lift_prototerm_proper.ma".
include "delayed_updating/substitution/lift_prototerm_eq.ma".
include "delayed_updating/syntax/path_head_structure.ma".
(* Constructions with unwind2 ***********************************************)
-lemma ifr_unwind_bi (f) (p) (q) (t1) (t2):
- t1 Ļµ š ā t1ā(pāš¦) Ļµ š ā
- t1 ā”š¢š[p,q] t2 ā ā¼[f]t1 ā”š¢š[āp,āq] ā¼[f]t2.
-#f #p #q #t1 #t2 #H1t1 #H2t1
-* #k * #H1k #Ht1 #Ht2
-@(ex_intro ā¦ (āāq)) @and3_intro
-[ -H1t1 -H2t1 -Ht1 -Ht2
+lemma ifr_unwind_bi (f) (t1) (t2) (r):
+ t1 Ļµ š ā r Ļµ š ā
+ t1 ā”š¢š[r] t2 ā ā¼[f]t1 ā”š¢š[ār] ā¼[f]t2.
+#f #t1 #t2 #r #H1t1 #H2r
+* #p #q #k #Hr #H1k #Ht1 #Ht2 destruct
+@(ex4_3_intro ā¦ (āp) (āq) (āāq))
+[ -H1t1 -H2r -H1k -Ht1 -Ht2 //
+| -H1t1 -H2r -Ht1 -Ht2
>structure_L_sn
>H1k in ā¢ (??%?); >path_head_structure_depth <H1k -H1k //
-| lapply (in_comp_unwind2_path_term f ā¦ Ht1) -Ht2 -Ht1 -H1t1 -H2t1
+| lapply (in_comp_unwind2_path_term f ā¦ Ht1) -Ht2 -Ht1 -H1t1 -H2r
<unwind2_path_d_dx <list_append_rcons_sn
lapply (unwind2_rmap_append_pap_closed f ā¦ (pāš) ā¦ H1k) -H1k
<depth_L_sn #H2k
lapply (eq_inv_ninj_bi ā¦ H2k) -H2k #H2k <H2k -H2k #Ht1 //
| lapply (unwind2_term_eq_repl_dx f ā¦ Ht2) -Ht2 #Ht2
@(subset_eq_trans ā¦ Ht2) -t2
- @(subset_eq_trans ā¦ (unwind2_term_fsubst ā¦))
+ @(subset_eq_trans ā¦ (unwind2_term_fsubst_pic ā¦))
[ @fsubst_eq_repl [ // | // ]
@(subset_eq_canc_sn ā¦ (lift_term_eq_repl_dx ā¦))
[ @unwind2_term_grafted_S /2 width=2 by ex_intro/ | skip ] -Ht1
(* Note: crux of the proof ends *)
| //
| /2 width=2 by ex_intro/
- | /2 width=6 by lift_term_proper/
+ | //
]
]
qed.