(**************************************************************************)
include "basic_2/notation/relations/statictypestar_6.ma".
-include "basic_2/static/sta.ma".
+include "basic_2/grammar/genv.ma".
+include "basic_2/substitution/drop.ma".
+include "basic_2/static/sh.ma".
(* NAT-ITERATED STATIC TYPE ASSIGNMENT FOR TERMS ****************************)
-definition lstas: ∀h. genv → lenv → nat → relation term ≝
- λh,G,L. lstar … (sta h G L).
+(* activate genv *)
+inductive lstas (h): nat → relation4 genv lenv term term ≝
+| lstas_sort: ∀G,L,d,k. lstas h d G L (⋆k) (⋆((next h)^d k))
+| lstas_ldef: ∀G,L,K,V,W,U,i,d. ⬇[i] L ≡ K.ⓓV → lstas h d G K V W →
+ ⬆[0, i+1] W ≡ U → lstas h d G L (#i) U
+| lstas_zero: ∀G,L,K,W,V,i. ⬇[i] L ≡ K.ⓛW → lstas h 0 G K W V →
+ lstas h 0 G L (#i) (#i)
+| lstas_succ: ∀G,L,K,W,V,U,i,d. ⬇[i] L ≡ K.ⓛW → lstas h d G K W V →
+ ⬆[0, i+1] V ≡ U → lstas h (d+1) G L (#i) U
+| lstas_bind: ∀a,I,G,L,V,T,U,d. lstas h d G (L.ⓑ{I}V) T U →
+ lstas h d G L (ⓑ{a,I}V.T) (ⓑ{a,I}V.U)
+| lstas_appl: ∀G,L,V,T,U,d. lstas h d G L T U → lstas h d G L (ⓐV.T) (ⓐV.U)
+| lstas_cast: ∀G,L,W,T,U,d. lstas h d G L T U → lstas h d G L (ⓝW.T) U
+.
interpretation "nat-iterated static type assignment (term)"
- 'StaticTypeStar h G L l T U = (lstas h G L l T U).
-
-(* Basic eliminators ********************************************************)
-
-lemma lstas_ind_sn: ∀h,G,L,U2. ∀R:relation2 nat term.
- R 0 U2 → (
- ∀l,T,U1. ⦃G, L⦄ ⊢ T •[h] U1 → ⦃G, L⦄ ⊢ U1 •* [h, l] U2 →
- R l U1 → R (l+1) T
- ) →
- ∀l,T. ⦃G, L⦄ ⊢ T •*[h, l] U2 → R l T.
-/3 width=5 by lstar_ind_l/ qed-.
-
-lemma lstas_ind_dx: ∀h,G,L,T. ∀R:relation2 nat term.
- R 0 T → (
- ∀l,U1,U2. ⦃G, L⦄ ⊢ T •* [h, l] U1 → ⦃G, L⦄ ⊢ U1 •[h] U2 →
- R l U1 → R (l+1) U2
- ) →
- ∀l,U. ⦃G, L⦄ ⊢ T •*[h, l] U → R l U.
-/3 width=5 by lstar_ind_r/ qed-.
+ 'StaticTypeStar h G L d T U = (lstas h d G L T U).
(* Basic inversion lemmas ***************************************************)
-lemma lstas_inv_O: ∀h,G,L,T,U. ⦃G, L⦄ ⊢ T •*[h, 0] U → T = U.
-/2 width=4 by lstar_inv_O/ qed-.
-
-lemma lstas_inv_SO: ∀h,G,L,T,U. ⦃G, L⦄ ⊢ T •*[h, 1] U → ⦃G, L⦄ ⊢ T •[h] U.
-/2 width=1 by lstar_inv_step/ qed-.
-
-lemma lstas_inv_step_sn: ∀h,G,L,T1,T2,l. ⦃G, L⦄ ⊢ T1 •*[h, l+1] T2 →
- ∃∃T. ⦃G, L⦄ ⊢ T1 •[h] T & ⦃G, L⦄ ⊢ T •*[h, l] T2.
-/2 width=3 by lstar_inv_S/ qed-.
-
-lemma lstas_inv_step_dx: ∀h,G,L,T1,T2,l. ⦃G, L⦄ ⊢ T1 •*[h, l+1] T2 →
- ∃∃T. ⦃G, L⦄ ⊢ T1 •*[h, l] T & ⦃G, L⦄ ⊢ T •[h] T2.
-/2 width=3 by lstar_inv_S_dx/ qed-.
-
-lemma lstas_inv_sort1: ∀h,G,L,X,k,l. ⦃G, L⦄ ⊢ ⋆k •*[h, l] X → X = ⋆((next h)^l k).
-#h #G #L #X #k #l #H @(lstas_ind_dx … H) -X -l //
-#l #X #X0 #_ #H #IHX destruct
-lapply (sta_inv_sort1 … H) -H #H destruct
->iter_SO //
+fact lstas_inv_sort1_aux: ∀h,G,L,T,U,d. ⦃G, L⦄ ⊢ T •*[h, d] U → ∀k0. T = ⋆k0 →
+ U = ⋆((next h)^d k0).
+#h #G #L #T #U #d * -G -L -T -U -d
+[ #G #L #d #k #k0 #H destruct //
+| #G #L #K #V #W #U #i #d #_ #_ #_ #k0 #H destruct
+| #G #L #K #W #V #i #_ #_ #k0 #H destruct
+| #G #L #K #W #V #U #i #d #_ #_ #_ #k0 #H destruct
+| #a #I #G #L #V #T #U #d #_ #k0 #H destruct
+| #G #L #V #T #U #d #_ #k0 #H destruct
+| #G #L #W #T #U #d #_ #k0 #H destruct
qed-.
-lemma lstas_inv_gref1: ∀h,G,L,X,p,l. ⦃G, L⦄ ⊢ §p •*[h, l+1] X → ⊥.
-#h #G #L #X #p #l #H elim (lstas_inv_step_sn … H) -H
-#U #H #HUX elim (sta_inv_gref1 … H)
+(* Basic_1: was just: sty0_gen_sort *)
+lemma lstas_inv_sort1: ∀h,G,L,X,k,d. ⦃G, L⦄ ⊢ ⋆k •*[h, d] X → X = ⋆((next h)^d k).
+/2 width=5 by lstas_inv_sort1_aux/
qed-.
-lemma lstas_inv_bind1: ∀h,a,I,G,L,V,T,X,l. ⦃G, L⦄ ⊢ ⓑ{a,I}V.T •*[h, l] X →
- ∃∃U. ⦃G, L.ⓑ{I}V⦄ ⊢ T •*[h, l] U & X = ⓑ{a,I}V.U.
-#h #a #I #G #L #V #T #X #l #H @(lstas_ind_dx … H) -X -l /2 width=3 by ex2_intro/
-#l #X #X0 #_ #HX0 * #U #HTU #H destruct
-elim (sta_inv_bind1 … HX0) -HX0 #U0 #HU0 #H destruct /3 width=3 by lstar_dx, ex2_intro/
+fact lstas_inv_lref1_aux: ∀h,G,L,T,U,d. ⦃G, L⦄ ⊢ T •*[h, d] U → ∀j. T = #j → ∨∨
+ (∃∃K,V,W. ⬇[j] L ≡ K.ⓓV & ⦃G, K⦄ ⊢ V •*[h, d] W &
+ ⬆[0, j+1] W ≡ U
+ ) |
+ (∃∃K,W,V. ⬇[j] L ≡ K.ⓛW & ⦃G, K⦄ ⊢ W •*[h, 0] V &
+ U = #j & d = 0
+ ) |
+ (∃∃K,W,V,d0. ⬇[j] L ≡ K.ⓛW & ⦃G, K⦄ ⊢ W •*[h, d0] V &
+ ⬆[0, j+1] V ≡ U & d = d0+1
+ ).
+#h #G #L #T #U #d * -G -L -T -U -d
+[ #G #L #d #k #j #H destruct
+| #G #L #K #V #W #U #i #d #HLK #HVW #HWU #j #H destruct /3 width=6 by or3_intro0, ex3_3_intro/
+| #G #L #K #W #V #i #HLK #HWV #j #H destruct /3 width=5 by or3_intro1, ex4_3_intro/
+| #G #L #K #W #V #U #i #d #HLK #HWV #HWU #j #H destruct /3 width=8 by or3_intro2, ex4_4_intro/
+| #a #I #G #L #V #T #U #d #_ #j #H destruct
+| #G #L #V #T #U #d #_ #j #H destruct
+| #G #L #W #T #U #d #_ #j #H destruct
+]
qed-.
-lemma lstas_inv_appl1: ∀h,G,L,V,T,X,l. ⦃G, L⦄ ⊢ ⓐV.T •*[h, l] X →
- ∃∃U. ⦃G, L⦄ ⊢ T •*[h, l] U & X = ⓐV.U.
-#h #G #L #V #T #X #l #H @(lstas_ind_dx … H) -X -l /2 width=3 by ex2_intro/
-#l #X #X0 #_ #HX0 * #U #HTU #H destruct
-elim (sta_inv_appl1 … HX0) -HX0 #U0 #HU0 #H destruct /3 width=3 by lstar_dx, ex2_intro/
+lemma lstas_inv_lref1: ∀h,G,L,X,i,d. ⦃G, L⦄ ⊢ #i •*[h, d] X → ∨∨
+ (∃∃K,V,W. ⬇[i] L ≡ K.ⓓV & ⦃G, K⦄ ⊢ V •*[h, d] W &
+ ⬆[0, i+1] W ≡ X
+ ) |
+ (∃∃K,W,V. ⬇[i] L ≡ K.ⓛW & ⦃G, K⦄ ⊢ W •*[h, 0] V &
+ X = #i & d = 0
+ ) |
+ (∃∃K,W,V,d0. ⬇[i] L ≡ K.ⓛW & ⦃G, K⦄ ⊢ W •*[h, d0] V &
+ ⬆[0, i+1] V ≡ X & d = d0+1
+ ).
+/2 width=3 by lstas_inv_lref1_aux/
qed-.
-lemma lstas_inv_cast1: ∀h,G,L,W,T,U,l. ⦃G, L⦄ ⊢ ⓝW.T •*[h, l+1] U → ⦃G, L⦄ ⊢ T •*[h, l+1] U.
-#h #G #L #W #T #X #l #H elim (lstas_inv_step_sn … H) -H
-#U #H #HUX lapply (sta_inv_cast1 … H) -H /2 width=3 by lstar_S/
+lemma lstas_inv_lref1_O: ∀h,G,L,X,i. ⦃G, L⦄ ⊢ #i •*[h, 0] X →
+ (∃∃K,V,W. ⬇[i] L ≡ K.ⓓV & ⦃G, K⦄ ⊢ V •*[h, 0] W &
+ ⬆[0, i+1] W ≡ X
+ ) ∨
+ (∃∃K,W,V. ⬇[i] L ≡ K.ⓛW & ⦃G, K⦄ ⊢ W •*[h, 0] V &
+ X = #i
+ ).
+#h #G #L #X #i #H elim (lstas_inv_lref1 … H) -H * /3 width=6 by ex3_3_intro, or_introl, or_intror/
+#K #W #V #d #_ #_ #_ <plus_n_Sm #H destruct
qed-.
-(* Basic properties *********************************************************)
-
-lemma lstas_refl: ∀h,G,L. reflexive … (lstas h G L 0).
-// qed.
+(* Basic_1: was just: sty0_gen_lref *)
+lemma lstas_inv_lref1_S: ∀h,G,L,X,i,d. ⦃G, L⦄ ⊢ #i •*[h, d+1] X →
+ (∃∃K,V,W. ⬇[i] L ≡ K.ⓓV & ⦃G, K⦄ ⊢ V •*[h, d+1] W &
+ ⬆[0, i+1] W ≡ X
+ ) ∨
+ (∃∃K,W,V. ⬇[i] L ≡ K.ⓛW & ⦃G, K⦄ ⊢ W •*[h, d] V &
+ ⬆[0, i+1] V ≡ X
+ ).
+#h #G #L #X #i #d #H elim (lstas_inv_lref1 … H) -H * /3 width=6 by ex3_3_intro, or_introl, or_intror/
+#K #W #V #_ #_ #_ <plus_n_Sm #H destruct
+qed-.
-lemma sta_lstas: ∀h,G,L,T,U. ⦃G, L⦄ ⊢ T •[h] U → ⦃G, L⦄ ⊢ T •*[h, 1] U.
-/2 width=1 by lstar_step/ qed.
+fact lstas_inv_gref1_aux: ∀h,G,L,T,U,d. ⦃G, L⦄ ⊢ T •*[h, d] U → ∀p0. T = §p0 → ⊥.
+#h #G #L #T #U #d * -G -L -T -U -d
+[ #G #L #d #k #p0 #H destruct
+| #G #L #K #V #W #U #i #d #_ #_ #_ #p0 #H destruct
+| #G #L #K #W #V #i #_ #_ #p0 #H destruct
+| #G #L #K #W #V #U #i #d #_ #_ #_ #p0 #H destruct
+| #a #I #G #L #V #T #U #d #_ #p0 #H destruct
+| #G #L #V #T #U #d #_ #p0 #H destruct
+| #G #L #W #T #U #d #_ #p0 #H destruct
+qed-.
-lemma lstas_step_sn: ∀h,G,L,T1,U1,U2,l. ⦃G, L⦄ ⊢ T1 •[h] U1 → ⦃G, L⦄ ⊢ U1 •*[h, l] U2 →
- ⦃G, L⦄ ⊢ T1 •*[h, l+1] U2.
-/2 width=3 by lstar_S/ qed.
+lemma lstas_inv_gref1: ∀h,G,L,X,p,d. ⦃G, L⦄ ⊢ §p •*[h, d] X → ⊥.
+/2 width=9 by lstas_inv_gref1_aux/
+qed-.
-lemma lstas_step_dx: ∀h,G,L,T1,T2,U2,l. ⦃G, L⦄ ⊢ T1 •*[h, l] T2 → ⦃G, L⦄ ⊢ T2 •[h] U2 →
- ⦃G, L⦄ ⊢ T1 •*[h, l+1] U2.
-/2 width=3 by lstar_dx/ qed.
+fact lstas_inv_bind1_aux: ∀h,G,L,T,U,d. ⦃G, L⦄ ⊢ T •*[h, d] U → ∀b,J,X,Y. T = ⓑ{b,J}Y.X →
+ ∃∃Z. ⦃G, L.ⓑ{J}Y⦄ ⊢ X •*[h, d] Z & U = ⓑ{b,J}Y.Z.
+#h #G #L #T #U #d * -G -L -T -U -d
+[ #G #L #d #k #b #J #X #Y #H destruct
+| #G #L #K #V #W #U #i #d #_ #_ #_ #b #J #X #Y #H destruct
+| #G #L #K #W #V #i #_ #_ #b #J #X #Y #H destruct
+| #G #L #K #W #V #U #i #d #_ #_ #_ #b #J #X #Y #H destruct
+| #a #I #G #L #V #T #U #d #HTU #b #J #X #Y #H destruct /2 width=3 by ex2_intro/
+| #G #L #V #T #U #d #_ #b #J #X #Y #H destruct
+| #G #L #W #T #U #d #_ #b #J #X #Y #H destruct
+]
+qed-.
-lemma lstas_split: ∀h,G,L. inv_ltransitive … (lstas h G L).
-/2 width=1 by lstar_inv_ltransitive/ qed-.
+(* Basic_1: was just: sty0_gen_bind *)
+lemma lstas_inv_bind1: ∀h,a,I,G,L,V,T,X,d. ⦃G, L⦄ ⊢ ⓑ{a,I}V.T •*[h, d] X →
+ ∃∃U. ⦃G, L.ⓑ{I}V⦄ ⊢ T •*[h, d] U & X = ⓑ{a,I}V.U.
+/2 width=3 by lstas_inv_bind1_aux/
+qed-.
-lemma lstas_sort: ∀h,G,L,l,k. ⦃G, L⦄ ⊢ ⋆k •*[h, l] ⋆((next h)^l k).
-#h #G #L #l @(nat_ind_plus … l) -l //
-#l #IHl #k >iter_SO /2 width=3 by sta_sort, lstas_step_dx/
-qed.
+fact lstas_inv_appl1_aux: ∀h,G,L,T,U,d. ⦃G, L⦄ ⊢ T •*[h, d] U → ∀X,Y. T = ⓐY.X →
+ ∃∃Z. ⦃G, L⦄ ⊢ X •*[h, d] Z & U = ⓐY.Z.
+#h #G #L #T #U #d * -G -L -T -U -d
+[ #G #L #d #k #X #Y #H destruct
+| #G #L #K #V #W #U #i #d #_ #_ #_ #X #Y #H destruct
+| #G #L #K #W #V #i #_ #_ #X #Y #H destruct
+| #G #L #K #W #V #U #i #d #_ #_ #_ #X #Y #H destruct
+| #a #I #G #L #V #T #U #d #_ #X #Y #H destruct
+| #G #L #V #T #U #d #HTU #X #Y #H destruct /2 width=3 by ex2_intro/
+| #G #L #W #T #U #d #_ #X #Y #H destruct
+]
+qed-.
-lemma lstas_bind: ∀h,I,G,L,V,T,U,l. ⦃G, L.ⓑ{I}V⦄ ⊢ T •*[h, l] U →
- ∀a. ⦃G, L⦄ ⊢ ⓑ{a,I}V.T •*[h, l] ⓑ{a,I}V.U.
-#h #I #G #L #V #T #U #l #H @(lstas_ind_dx … H) -U -l /3 width=3 by sta_bind, lstar_O, lstas_step_dx/
-qed.
+(* Basic_1: was just: sty0_gen_appl *)
+lemma lstas_inv_appl1: ∀h,G,L,V,T,X,d. ⦃G, L⦄ ⊢ ⓐV.T •*[h, d] X →
+ ∃∃U. ⦃G, L⦄ ⊢ T •*[h, d] U & X = ⓐV.U.
+/2 width=3 by lstas_inv_appl1_aux/
+qed-.
-lemma lstas_appl: ∀h,G,L,T,U,l. ⦃G, L⦄ ⊢ T •*[h, l] U →
- ∀V.⦃G, L⦄ ⊢ ⓐV.T •*[h, l] ⓐV.U.
-#h #G #L #T #U #l #H @(lstas_ind_dx … H) -U -l /3 width=3 by sta_appl, lstar_O, lstas_step_dx/
-qed.
+fact lstas_inv_cast1_aux: ∀h,G,L,T,U,d. ⦃G, L⦄ ⊢ T •*[h, d] U → ∀X,Y. T = ⓝY.X →
+ ⦃G, L⦄ ⊢ X •*[h, d] U.
+#h #G #L #T #U #d * -G -L -T -U -d
+[ #G #L #d #k #X #Y #H destruct
+| #G #L #K #V #W #U #i #d #_ #_ #_ #X #Y #H destruct
+| #G #L #K #W #V #i #_ #_ #X #Y #H destruct
+| #G #L #K #W #V #U #i #d #_ #_ #_ #X #Y #H destruct
+| #a #I #G #L #V #T #U #d #_ #X #Y #H destruct
+| #G #L #V #T #U #d #_ #X #Y #H destruct
+| #G #L #W #T #U #d #HTU #X #Y #H destruct //
+]
+qed-.
-lemma lstas_cast: ∀h,G,L,T,U,l. ⦃G, L⦄ ⊢ T •*[h, l+1] U →
- ∀W. ⦃G, L⦄ ⊢ ⓝW.T •*[h, l+1] U.
-#h #G #L #T #U #l #H elim (lstas_inv_step_sn … H) -H /3 width=3 by sta_cast, lstas_step_sn/
-qed.
+(* Basic_1: was just: sty0_gen_cast *)
+lemma lstas_inv_cast1: ∀h,G,L,W,T,U,d. ⦃G, L⦄ ⊢ ⓝW.T •*[h, d] U → ⦃G, L⦄ ⊢ T •*[h, d] U.
+/2 width=4 by lstas_inv_cast1_aux/
+qed-.
(* Basic_1: removed theorems 7:
sty1_abbr sty1_appl sty1_bind sty1_cast2
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