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/dynamic/snv_lift.ma".
16 include "basic_2/dynamic/snv_cpcs.ma".
18 (* STRATIFIED NATIVE VALIDITY FOR TERMS *************************************)
20 (* Properties on nat-iterated stratified static type assignment for terms ***)
22 fact snv_lsstas_aux: ∀h,g,G0,L0,T0.
23 (∀G1,L1,T1. ⦃G0, L0, T0⦄ >[h, g] ⦃G1, L1, T1⦄ → IH_snv_cpr_lpr h g G1 L1 T1) →
24 (∀G1,L1,T1. ⦃G0, L0, T0⦄ >[h, g] ⦃G1, L1, T1⦄ → IH_da_cpr_lpr h g G1 L1 T1) →
25 (∀G1,L1,T1. ⦃G0, L0, T0⦄ >[h, g] ⦃G1, L1, T1⦄ → IH_lsstas_cpr_lpr h g G1 L1 T1) →
26 (∀G1,L1,T1. ⦃G0, L0, T0⦄ >[h, g] ⦃G1, L1, T1⦄ → IH_snv_lsstas h g G1 L1 T1) →
27 ∀G1,L1,T1. G0 = G1 → L0 = L1 → T0 = T1 → IH_snv_lsstas h g G1 L1 T1.
28 #h #g #G0 #L0 #T0 #IH4 #IH3 #IH2 #IH1 #G1 #L1 * * [|||| * ]
29 [ #k #HG0 #HL0 #HT0 #_ #l1 #l2 #Hl21 #Hl1 #X #H2 destruct -IH4 -IH3 -IH2 -IH1
30 >(lsstas_inv_sort1 … H2) -X //
31 | #i #HG0 #HL0 #HT0 #H1 #l1 #l2 @(nat_ind_plus … l2) -l2 [ #_ | #l2 #_ #Hl21 ] #Hl1 #X #H2 destruct -IH4 -IH3 -IH2
32 [ lapply (lsstas_inv_O … H2) -H2 #H destruct // ]
33 elim (snv_inv_lref … H1) -H1 #I0 #K0 #X0 #HLK0 #HX0
34 elim (da_inv_lref … Hl1) -Hl1 * #K1 [ #V1 | #W1 #l ] #HLK1 [ #Hl1 | #Hl #H ]
35 lapply (ldrop_mono … HLK0 … HLK1) -HLK0 #H0 destruct
36 elim (lsstas_inv_lref1 … H2) -H2 * #K0 #Y0 #X0 [2,4: #l0 ] #HLK0 [1,2: #HYl0 ] #HYX0 #HX0
37 lapply (ldrop_mono … HLK0 … HLK1) -HLK0 #H destruct
38 [ lapply (le_plus_to_le_r … Hl21) -Hl21 #Hl21 ]
39 lapply (fsupp_lref … G1 … HLK1) #H
40 lapply (ldrop_fwd_ldrop2 … HLK1) -HLK1 /4 width=8 by fsupp_ygt, snv_lift/
41 | #p #HG0 #HL0 #HT0 #H1 #l1 #l2 #Hl21 #Hl1 #X #H2 destruct -IH4 -IH3 -IH2 -IH1
42 elim (snv_inv_gref … H1)
43 | #a #I #V1 #T1 #HG0 #HL0 #HT0 #H1 #l1 #l2 #Hl21 #Hl1 #X #H2 destruct -IH4 -IH3 -IH2
44 elim (snv_inv_bind … H1) -H1 #HV1 #HT1
45 lapply (da_inv_bind … Hl1) -Hl1 #Hl1
46 elim (lsstas_inv_bind1 … H2) -H2 #U1 #HTU1 #H destruct /4 width=8 by fsupp_ygt, snv_bind/
47 | #V1 #T1 #HG0 #HL0 #HT0 #H1 #l1 #l2 #Hl21 #Hl1 #X #H2 destruct
48 elim (snv_inv_appl … H1) -H1 #a #W1 #W0 #T0 #l0 #HV1 #HT1 #Hl0 #HVW1 #HW10 #HT10
49 lapply (da_inv_flat … Hl1) -Hl1 #Hl1
50 elim (lsstas_inv_appl1 … H2) -H2 #U1 #HTU1 #H destruct
51 lapply (IH1 … HT1 … Hl1 … HTU1) /2 width=1 by fsupp_ygt/ #HU1
52 elim (lsstas_cpds_aux … IH1 IH4 IH3 IH2 … Hl1 … HTU1 … HT10) -IH4 -IH3 -IH2 -IH1 /2 width=1 by fsupp_ygt/ -T1 -l1 #X #l #_ #H #HU10 -l2
53 elim (lsstas_inv_bind1 … H) -H #U0 #_ #H destruct -T0 -l
54 elim (cpes_inv_abst2 … HU10) -HU10 #W2 #U2 #HU12 #HU02
55 elim (cprs_inv_abst … HU02) -HU02 #HW02 #_
56 /3 width=7 by snv_appl, cprs_trans/
57 | #W1 #T1 #HG0 #HL0 #HT0 #H1 #l1 #l2 @(nat_ind_plus … l2) -l2 [ #_ | #l2 #_ #Hl21 ] #Hl1 #X #H2 destruct -IH4 -IH3 -IH2
58 [ lapply (lsstas_inv_O … H2) -H2 #H destruct // ]
59 elim (snv_inv_cast … H1) -H1
60 lapply (da_inv_flat … Hl1) -Hl1
61 lapply (lsstas_inv_cast1 … H2) -H2 /3 width=8 by fsupp_ygt/