+++ /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/unwind/unwind2_prototerm_eq.ma".
-include "delayed_updating/unwind/unwind2_path_append.ma".
-include "delayed_updating/substitution/fsubst.ma".
-include "delayed_updating/syntax/preterm.ma".
-include "delayed_updating/syntax/prototerm_proper.ma".
-
-(* TAILED UNWIND FOR PRETERM ************************************************)
-
-(* Constructions with fsubst and pic ****************************************)
-
-lemma unwind2_term_fsubst_pic_sn (f) (t) (u) (p): p Ļµ š ā
- (ā¼[f]t)[ā(āp)āā¼[ā¶[f]p]u] ā ā¼[f](t[āpāu]).
-#f #t #u #p #Hp #ql * *
-[ #rl * #r #Hr #H1 #H2 destruct
- >unwind2_path_append_pic_sn
- /4 width=3 by in_comp_unwind2_path_term, or_introl, ex2_intro/
-| * #q #Hq #H1 #H0
- @(ex2_intro ā¦ H1) @or_intror @conj // *
- [ <list_append_empty_sn #H2 destruct
- elim (unwind2_path_root f q) #r #_ #Hr /2 width=2 by/
- | #l #r #H2 destruct
- /3 width=2 by unwind2_path_append_pic_sn/
- ]
-]
-qed-.
-
-lemma unwind2_term_fsubst_pic_dx (f) (t) (u) (p): p Ļµ š ā p Ļµ āµt ā t Ļµ š ā
- ā¼[f](t[āpāu]) ā (ā¼[f]t)[ā(āp)āā¼[ā¶[f]p]u].
-#f #t #u #p #Hp #H1p #H2p #ql * #q * *
-[ #r #Hu #H1 #H2 destruct
- /5 width=3 by unwind2_path_append_pic_sn, ex2_intro, or_introl/
-| #Hq #H0 #H1 destruct
- @or_intror @conj [ /2 width=1 by in_comp_unwind2_path_term/ ] *
- [ <list_append_empty_sn #Hr @(H0 ā¦ (š)) -H0
- <list_append_empty_sn @H2p -H2p
- /2 width=2 by unwind2_path_des_structure, prototerm_in_comp_root/
- | #l #r #Hr
- elim (unwind2_path_inv_append_ppc_dx ā¦ Hr) -Hr // #s1 #s2 #Hs1 #_ #H1 destruct
- lapply (H2p ā¦ Hs1) -H2p -Hs1 /2 width=2 by ex_intro/
- ]
-]
-qed-.
-
-lemma unwind2_term_fsubst_pic (f) (t) (u) (p): p Ļµ š ā p Ļµ āµt ā t Ļµ š ā
- (ā¼[f]t)[ā(āp)āā¼[ā¶[f]p]u] ā ā¼[f](t[āpāu]).
-/4 width=3 by unwind2_term_fsubst_pic_sn, conj, unwind2_term_fsubst_pic_dx/ qed.
-
-(* Constructions with fsubst and ppc ****************************************)
-
-lemma unwind2_term_fsubst_ppc_sn (f) (t) (u) (p): u Ļµ š ā
- (ā¼[f]t)[ā(āp)āā¼[ā¶[f]p]u] ā ā¼[f](t[āpāu]).
-#f #t #u #p #Hu #ql * *
-[ #rl * #r #Hr #H1 #H2 destruct
- >unwind2_path_append_ppc_dx
- /4 width=5 by in_comp_unwind2_path_term, in_comp_tpc_trans, or_introl, ex2_intro/
-| * #q #Hq #H1 #H0
- @(ex2_intro ā¦ H1) @or_intror @conj // *
- [ <list_append_empty_sn #H2 destruct
- elim (unwind2_path_root f q) #r #_ #Hr /2 width=2 by/
- | #l #r #H2 destruct
- @H0 -H0 [| <unwind2_path_append_ppc_dx /2 width=3 by ppc_rcons/ ]
- ]
-]
-qed-.
-
-lemma unwind2_term_fsubst_ppc_dx (f) (t) (u) (p): u Ļµ š ā p Ļµ āµt ā t Ļµ š ā
- ā¼[f](t[āpāu]) ā (ā¼[f]t)[ā(āp)āā¼[ā¶[f]p]u].
-#f #t #u #p #Hu #H1p #H2p #ql * #q * *
-[ #r #Hu #H1 #H2 destruct
- @or_introl @ex2_intro
- [|| <unwind2_path_append_ppc_dx /2 width=5 by in_comp_tpc_trans/ ]
- /2 width=3 by ex2_intro/
-| #Hq #H0 #H1 destruct
- @or_intror @conj [ /2 width=1 by in_comp_unwind2_path_term/ ] *
- [ <list_append_empty_sn #Hr @(H0 ā¦ (š)) -H0
- <list_append_empty_sn @H2p -H2p
- /2 width=2 by unwind2_path_des_structure, prototerm_in_comp_root/
- | #l #r #Hr
- elim (unwind2_path_inv_append_ppc_dx ā¦ Hr) -Hr // #s1 #s2 #Hs1 #_ #H1 destruct
- lapply (H2p ā¦ Hs1) -H2p -Hs1 /2 width=2 by ex_intro/
- ]
-]
-qed-.
-
-lemma unwind2_term_fsubst_ppc (f) (t) (u) (p): u Ļµ š ā p Ļµ āµt ā t Ļµ š ā
- (ā¼[f]t)[ā(āp)āā¼[ā¶[f]p]u] ā ā¼[f](t[āpāu]).
-/4 width=3 by unwind2_term_fsubst_ppc_sn, conj, unwind2_term_fsubst_ppc_dx/ qed.