1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "basic_2/rt_equivalence/cpes_cpes.ma".
16 include "basic_2/dynamic/cnv_cpmhe.ma".
17 include "basic_2/dynamic/cnv_cpes.ma".
18 include "basic_2/dynamic/cnv_preserve_cpes.ma".
20 (* CONTEXT-SENSITIVE NATIVE VALIDITY FOR TERMS ******************************)
22 (* main properties with evaluations for rt-transition on terms **************)
24 theorem cnv_dec (a) (h) (G) (L) (T): ac_props a →
25 Decidable (⦃G,L⦄ ⊢ T ![a,h]).
27 @(fqup_wf_ind_eq (Ⓣ) … G L T) -G -L -T #G0 #L0 #T0 #IH #G #L * * [|||| * ]
28 [ #s #HG #HL #HT destruct -Ha -IH
29 /2 width=1 by cnv_sort, or_introl/
30 | #i #HG #HL #HT destruct -Ha
31 elim (drops_F_uni L i) [| * * ]
32 [ /3 width=8 by cnv_inv_lref_atom, or_intror/
33 | /3 width=9 by cnv_inv_lref_unit, or_intror/
35 elim (IH G K V) -IH [3: /2 width=2 by fqup_lref/ ]
36 [ /3 width=5 by cnv_lref_drops, or_introl/
37 | /4 width=5 by cnv_inv_lref_pair, or_intror/
40 | #l #HG #HL #HT destruct -Ha -IH
41 /3 width=6 by cnv_inv_gref, or_intror/
42 | #p #I #V #T #HG #HL #HT destruct -Ha
43 elim (IH G L V) [| -IH | // ] #HV
44 [ elim (IH G (L.ⓑ{I}V) T) -IH [3: // ] #HT
45 [ /3 width=1 by cnv_bind, or_introl/ ]
48 elim (cnv_inv_bind … H) -H /2 width=1 by/
49 | #V #T #HG #HL #HT destruct
50 elim (IH G L V) [| -IH #HV | // ]
51 [ elim (IH G L T) -IH [| #HT #HV | // ]
53 elim (cnv_R_cpmhe_total … HT) #n #Hn
54 elim (dec_min (R_cpmhe h G L T) … Hn) -Hn
55 [| /2 width=2 by cnv_R_cpmhe_dec/ ] #n0 #_ -n
56 elim (ac_dec … Ha n0) -Ha
57 [ * #n #Hn #Ha * #X0 #HX0 #_
59 [ * #p #W #U0 #H destruct
60 elim (cnv_cpes_dec … 1 0 … HV W) [ #HVW | #HnVW ]
61 [ lapply (cpmhe_fwd_cpms … HX0) -HX0 #HTU0
62 elim (cnv_fwd_cpms_abst_dx_le … HT … HTU0 … Hn) #U #HTU #_ -U0 -n0
63 /3 width=7 by cnv_appl_cpes, or_introl/
64 (* Note: argument type mismatch *)
66 elim (cnv_inv_appl_cpes … H) -H #m0 #q #WX #UX #_ #_ #_ #HVWX #HTUX
67 lapply (cpmhe_abst … HTUX) -HTUX #HTUX
68 elim (cnv_cpmhe_mono … HT … HTUX … HX0) -a -T #H #_
69 elim (cpes_fwd_abst_bi … H) -H #_ #HWX -n0 -m0 -p -q -UX -U0
70 /3 width=3 by cpes_cpes_trans/
71 | lapply (cnv_cpmhe_trans … HT … HX0) -T #H
72 elim (cnv_inv_bind … H) -H #HW #_ //
74 (* Note: no expected type *)
77 elim (cnv_inv_appl_cpes … H) -H #m0 #q #W0 #U0 #_ #_ #_ #_ #HTU0
78 lapply (cpmhe_abst … HTU0) -HTU0 #HTU0
79 elim (cnv_cpmhe_mono … HT … HTU0 … HX0) -T #_ #H
80 elim (theq_inv_pair1 … H) -W0 -U0 #W0 #U0 #H destruct
83 (* Note: failed applicability *)
86 elim (cnv_inv_appl … H) -H #m0 #q #W0 #U0 #Hm0 #_ #_ #_ #HTU0
87 elim (lt_or_ge m0 n0) #H0 [| /3 width=3 by ex2_intro/ ] -Hm0 -Hge
88 /4 width=6 by cpmhe_abst, ex_intro/
93 elim (cnv_inv_appl … H) -H /2 width=1 by/
94 | #U #T #HG #HL #HT destruct
95 elim (IH G L U) [| -IH | // ] #HU
96 [ elim (IH G L T) -IH [3: // ] #HT
97 [ elim (cnv_cpes_dec … 0 1 … HU … HT) #HUT
98 [ /3 width=1 by cnv_cast_cpes, or_introl/ ]
102 elim (cnv_inv_cast_cpes … H) -H /2 width=1 by/