(* *)
(**************************************************************************)
-include "ground_2/steps/rtc_shift.ma".
+include "ground_2/steps/rtc_max.ma".
include "ground_2/steps/rtc_plus.ma".
-include "basic_2/notation/relations/pred_6.ma".
-include "basic_2/grammar/lenv.ma".
-include "basic_2/grammar/genv.ma".
-include "basic_2/relocation/lifts.ma".
-include "basic_2/static/sh.ma".
+include "basic_2/notation/relations/predty_7.ma".
+include "static_2/syntax/item_sh.ma".
+include "static_2/syntax/lenv.ma".
+include "static_2/syntax/genv.ma".
+include "static_2/relocation/lifts.ma".
-(* CONTEXT-SENSITIVE GENERIC PARALLEL RT-TRANSITION FOR TERMS ***************)
+(* BOUND CONTEXT-SENSITIVE PARALLEL RT-TRANSITION FOR TERMS *****************)
(* avtivate genv *)
-inductive cpg (h): rtc → relation4 genv lenv term term ≝
-| cpg_atom : ∀I,G,L. cpg h (𝟘𝟘) G L (⓪{I}) (⓪{I})
-| cpg_ess : ∀G,L,s. cpg h (𝟘𝟙) G L (⋆s) (⋆(next h s))
-| cpg_delta: ∀c,G,L,V1,V2,W2. cpg h c G L V1 V2 →
- â¬\86*[1] V2 â\89¡ W2 â\86\92 cpg h (â\86\93c) G (L.ⓓV1) (#0) W2
-| cpg_ell : ∀c,G,L,V1,V2,W2. cpg h c G L V1 V2 →
- â¬\86*[1] V2 â\89¡ W2 â\86\92 cpg h ((â\86\93c)+𝟘𝟙) G (L.ⓛV1) (#0) W2
-| cpg_lref : ∀c,I,G,L,V,T,U,i. cpg h c G L (#i) T →
- â¬\86*[1] T â\89¡ U â\86\92 cpg h c G (L.â\93\91{I}V) (#⫯i) U
+inductive cpg (Rt:relation rtc) (h): rtc → relation4 genv lenv term term ≝
+| cpg_atom : ∀I,G,L. cpg Rt h (𝟘𝟘) G L (⓪{I}) (⓪{I})
+| cpg_ess : ∀G,L,s. cpg Rt h (𝟘𝟙) G L (⋆s) (⋆(next h s))
+| cpg_delta: ∀c,G,L,V1,V2,W2. cpg Rt h c G L V1 V2 →
+ â¬\86*[1] V2 â\89\98 W2 â\86\92 cpg Rt h c G (L.ⓓV1) (#0) W2
+| cpg_ell : ∀c,G,L,V1,V2,W2. cpg Rt h c G L V1 V2 →
+ â¬\86*[1] V2 â\89\98 W2 â\86\92 cpg Rt h (c+𝟘𝟙) G (L.ⓛV1) (#0) W2
+| cpg_lref : ∀c,I,G,L,T,U,i. cpg Rt h c G L (#i) T →
+ â¬\86*[1] T â\89\98 U â\86\92 cpg Rt h c G (L.â\93\98{I}) (#â\86\91i) U
| cpg_bind : ∀cV,cT,p,I,G,L,V1,V2,T1,T2.
- cpg h cV G L V1 V2 → cpg h cT G (L.ⓑ{I}V1) T1 T2 →
- cpg h ((↓cV)+cT) G L (ⓑ{p,I}V1.T1) (ⓑ{p,I}V2.T2)
-| cpg_flat : ∀cV,cT,I,G,L,V1,V2,T1,T2.
- cpg h cV G L V1 V2 → cpg h cT G L T1 T2 →
- cpg h ((↓cV)+cT) G L (ⓕ{I}V1.T1) (ⓕ{I}V2.T2)
-| cpg_zeta : ∀c,G,L,V,T1,T,T2. cpg h c G (L.ⓓV) T1 T →
- ⬆*[1] T2 ≡ T → cpg h ((↓c)+𝟙𝟘) G L (+ⓓV.T1) T2
-| cpg_eps : ∀c,G,L,V,T1,T2. cpg h c G L T1 T2 → cpg h ((↓c)+𝟙𝟘) G L (ⓝV.T1) T2
-| cpg_ee : ∀c,G,L,V1,V2,T. cpg h c G L V1 V2 → cpg h ((↓c)+𝟘𝟙) G L (ⓝV1.T) V2
+ cpg Rt h cV G L V1 V2 → cpg Rt h cT G (L.ⓑ{I}V1) T1 T2 →
+ cpg Rt h ((↕*cV)∨cT) G L (ⓑ{p,I}V1.T1) (ⓑ{p,I}V2.T2)
+| cpg_appl : ∀cV,cT,G,L,V1,V2,T1,T2.
+ cpg Rt h cV G L V1 V2 → cpg Rt h cT G L T1 T2 →
+ cpg Rt h ((↕*cV)∨cT) G L (ⓐV1.T1) (ⓐV2.T2)
+| cpg_cast : ∀cU,cT,G,L,U1,U2,T1,T2. Rt cU cT →
+ cpg Rt h cU G L U1 U2 → cpg Rt h cT G L T1 T2 →
+ cpg Rt h (cU∨cT) G L (ⓝU1.T1) (ⓝU2.T2)
+| cpg_zeta : ∀c,G,L,V,T1,T,T2. cpg Rt h c G (L.ⓓV) T1 T →
+ ⬆*[1] T2 ≘ T → cpg Rt h (c+𝟙𝟘) G L (+ⓓV.T1) T2
+| cpg_eps : ∀c,G,L,V,T1,T2. cpg Rt h c G L T1 T2 → cpg Rt h (c+𝟙𝟘) G L (ⓝV.T1) T2
+| cpg_ee : ∀c,G,L,V1,V2,T. cpg Rt h c G L V1 V2 → cpg Rt h (c+𝟘𝟙) G L (ⓝV1.T) V2
| cpg_beta : ∀cV,cW,cT,p,G,L,V1,V2,W1,W2,T1,T2.
- cpg h cV G L V1 V2 → cpg h cW G L W1 W2 → cpg h cT G (L.ⓛW1) T1 T2 →
- cpg h ((↓cV)+(↓cW)+(↓cT)+𝟙𝟘) G L (ⓐV1.ⓛ{p}W1.T1) (ⓓ{p}ⓝW2.V2.T2)
+ cpg Rt h cV G L V1 V2 → cpg Rt h cW G L W1 W2 → cpg Rt h cT G (L.ⓛW1) T1 T2 →
+ cpg Rt h (((↕*cV)∨(↕*cW)∨cT)+𝟙𝟘) G L (ⓐV1.ⓛ{p}W1.T1) (ⓓ{p}ⓝW2.V2.T2)
| cpg_theta: ∀cV,cW,cT,p,G,L,V1,V,V2,W1,W2,T1,T2.
- cpg h cV G L V1 V → ⬆*[1] V ≡ V2 → cpg h cW G L W1 W2 →
- cpg h cT G (L.ⓓW1) T1 T2 →
- cpg h ((↓cV)+(↓cW)+(↓cT)+𝟙𝟘) G L (ⓐV1.ⓓ{p}W1.T1) (ⓓ{p}W2.ⓐV2.T2)
+ cpg Rt h cV G L V1 V → ⬆*[1] V ≘ V2 → cpg Rt h cW G L W1 W2 →
+ cpg Rt h cT G (L.ⓓW1) T1 T2 →
+ cpg Rt h (((↕*cV)∨(↕*cW)∨cT)+𝟙𝟘) G L (ⓐV1.ⓓ{p}W1.T1) (ⓓ{p}W2.ⓐV2.T2)
.
interpretation
- "context-sensitive generic parallel rt-transition (term)"
- 'PRed c h G L T1 T2 = (cpg h c G L T1 T2).
+ "bound context-sensitive parallel rt-transition (term)"
+ 'PRedTy Rt c h G L T1 T2 = (cpg Rt h c G L T1 T2).
(* Basic properties *********************************************************)
-(* Note: this is "∀h,g,L. reflexive … (cpg h (𝟘𝟘) L)" *)
-lemma cpg_refl: ∀h,G,T,L. ⦃G, L⦄ ⊢ T ➡[𝟘𝟘, h] T.
-#h #G #T elim T -T // * /2 width=1 by cpg_bind, cpg_flat/
-qed.
-
-lemma cpg_pair_sn: ∀c,h,I,G,L,V1,V2. ⦃G, L⦄ ⊢ V1 ➡[c, h] V2 →
- ∀T. ⦃G, L⦄ ⊢ ②{I}V1.T ➡[↓c, h] ②{I}V2.T.
-#c #h * /2 width=1 by cpg_bind, cpg_flat/
+(* Note: this is "∀Rt. reflexive … Rt → ∀h,g,L. reflexive … (cpg Rt h (𝟘𝟘) L)" *)
+lemma cpg_refl: ∀Rt. reflexive … Rt → ∀h,G,T,L. ⦃G, L⦄ ⊢ T ⬈[Rt, 𝟘𝟘, h] T.
+#Rt #HRt #h #G #T elim T -T // * /2 width=1 by cpg_bind/
+* /2 width=1 by cpg_appl, cpg_cast/
qed.
(* Basic inversion lemmas ***************************************************)
-fact cpg_inv_atom1_aux: ∀c,h,G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ➡[c, h] T2 → ∀J. T1 = ⓪{J} →
+fact cpg_inv_atom1_aux: ∀Rt,c,h,G,L,T1,T2. ⦃G, L⦄ ⊢ T1 ⬈[Rt, c, h] T2 → ∀J. T1 = ⓪{J} →
∨∨ T2 = ⓪{J} ∧ c = 𝟘𝟘
| ∃∃s. J = Sort s & T2 = ⋆(next h s) & c = 𝟘𝟙
- | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â\9e¡[cV, h] V2 & â¬\86*[1] V2 â\89¡ T2 &
- L = K.ⓓV1 & J = LRef 0 & c = ↓cV
- | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â\9e¡[cV, h] V2 & â¬\86*[1] V2 â\89¡ T2 &
- L = K.ⓛV1 & J = LRef 0 & c = (↓cV)+𝟘𝟙
- | ∃∃I,K,V,T,i. ⦃G, K⦄ ⊢ #i ➡[c, h] T & ⬆*[1] T ≡ T2 &
- L = K.ⓑ{I}V & J = LRef (⫯i).
-#c #h #G #L #T1 #T2 * -c -G -L -T1 -T2
+ | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â¬\88[Rt, cV, h] V2 & â¬\86*[1] V2 â\89\98 T2 &
+ L = K.ⓓV1 & J = LRef 0 & c = cV
+ | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â¬\88[Rt, cV, h] V2 & â¬\86*[1] V2 â\89\98 T2 &
+ L = K.ⓛV1 & J = LRef 0 & c = cV+𝟘𝟙
+ | ∃∃I,K,T,i. ⦃G, K⦄ ⊢ #i ⬈[Rt, c, h] T & ⬆*[1] T ≘ T2 &
+ L = K.ⓘ{I} & J = LRef (↑i).
+#Rt #c #h #G #L #T1 #T2 * -c -G -L -T1 -T2
[ #I #G #L #J #H destruct /3 width=1 by or5_intro0, conj/
| #G #L #s #J #H destruct /3 width=3 by or5_intro1, ex3_intro/
| #c #G #L #V1 #V2 #W2 #HV12 #VW2 #J #H destruct /3 width=8 by or5_intro2, ex5_4_intro/
| #c #G #L #V1 #V2 #W2 #HV12 #VW2 #J #H destruct /3 width=8 by or5_intro3, ex5_4_intro/
-| #c #I #G #L #V #T #U #i #HT #HTU #J #H destruct /3 width=9 by or5_intro4, ex4_5_intro/
+| #c #I #G #L #T #U #i #HT #HTU #J #H destruct /3 width=8 by or5_intro4, ex4_4_intro/
| #cV #cT #p #I #G #L #V1 #V2 #T1 #T2 #_ #_ #J #H destruct
-| #cV #cT #I #G #L #V1 #V2 #T1 #T2 #_ #_ #J #H destruct
+| #cV #cT #G #L #V1 #V2 #T1 #T2 #_ #_ #J #H destruct
+| #cU #cT #G #L #U1 #U2 #T1 #T2 #_ #_ #_ #J #H destruct
| #c #G #L #V #T1 #T #T2 #_ #_ #J #H destruct
| #c #G #L #V #T1 #T2 #_ #J #H destruct
| #c #G #L #V1 #V2 #T #_ #J #H destruct
]
qed-.
-lemma cpg_inv_atom1: ∀c,h,J,G,L,T2. ⦃G, L⦄ ⊢ ⓪{J} ➡[c, h] T2 →
+lemma cpg_inv_atom1: ∀Rt,c,h,J,G,L,T2. ⦃G, L⦄ ⊢ ⓪{J} ⬈[Rt, c, h] T2 →
∨∨ T2 = ⓪{J} ∧ c = 𝟘𝟘
| ∃∃s. J = Sort s & T2 = ⋆(next h s) & c = 𝟘𝟙
- | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â\9e¡[cV, h] V2 & â¬\86*[1] V2 â\89¡ T2 &
- L = K.ⓓV1 & J = LRef 0 & c = ↓cV
- | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â\9e¡[cV, h] V2 & â¬\86*[1] V2 â\89¡ T2 &
- L = K.ⓛV1 & J = LRef 0 & c = (↓cV)+𝟘𝟙
- | ∃∃I,K,V,T,i. ⦃G, K⦄ ⊢ #i ➡[c, h] T & ⬆*[1] T ≡ T2 &
- L = K.ⓑ{I}V & J = LRef (⫯i).
+ | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â¬\88[Rt, cV, h] V2 & â¬\86*[1] V2 â\89\98 T2 &
+ L = K.ⓓV1 & J = LRef 0 & c = cV
+ | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â¬\88[Rt, cV, h] V2 & â¬\86*[1] V2 â\89\98 T2 &
+ L = K.ⓛV1 & J = LRef 0 & c = cV+𝟘𝟙
+ | ∃∃I,K,T,i. ⦃G, K⦄ ⊢ #i ⬈[Rt, c, h] T & ⬆*[1] T ≘ T2 &
+ L = K.ⓘ{I} & J = LRef (↑i).
/2 width=3 by cpg_inv_atom1_aux/ qed-.
-lemma cpg_inv_sort1: ∀c,h,G,L,T2,s. ⦃G, L⦄ ⊢ ⋆s ➡[c, h] T2 →
- (T2 = ⋆s ∧ c = 𝟘𝟘) ∨ (T2 = ⋆(next h s) ∧ c = 𝟘𝟙).
-#c #h #G #L #T2 #s #H
+lemma cpg_inv_sort1: ∀Rt,c,h,G,L,T2,s. ⦃G, L⦄ ⊢ ⋆s ⬈[Rt, c, h] T2 →
+ ∨∨ T2 = ⋆s ∧ c = 𝟘𝟘 | T2 = ⋆(next h s) ∧ c = 𝟘𝟙.
+#Rt #c #h #G #L #T2 #s #H
elim (cpg_inv_atom1 … H) -H * /3 width=1 by or_introl, conj/
[ #s0 #H destruct /3 width=1 by or_intror, conj/
|2,3: #cV #K #V1 #V2 #_ #_ #_ #H destruct
-| #I #K #V1 #V2 #i #_ #_ #_ #H destruct
+| #I #K #T #i #_ #_ #_ #H destruct
]
qed-.
-lemma cpg_inv_zero1: ∀c,h,G,L,T2. ⦃G, L⦄ ⊢ #0 ➡[c, h] T2 →
- ∨∨ (T2 = #0 ∧ c = 𝟘𝟘)
- | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â\9e¡[cV, h] V2 & â¬\86*[1] V2 â\89¡ T2 &
- L = K.ⓓV1 & c = ↓cV
- | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â\9e¡[cV, h] V2 & â¬\86*[1] V2 â\89¡ T2 &
- L = K.ⓛV1 & c = (↓cV)+𝟘𝟙.
-#c #h #G #L #T2 #H
+lemma cpg_inv_zero1: ∀Rt,c,h,G,L,T2. ⦃G, L⦄ ⊢ #0 ⬈[Rt, c, h] T2 →
+ ∨∨ T2 = #0 ∧ c = 𝟘𝟘
+ | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â¬\88[Rt, cV, h] V2 & â¬\86*[1] V2 â\89\98 T2 &
+ L = K.ⓓV1 & c = cV
+ | â\88\83â\88\83cV,K,V1,V2. â¦\83G, Kâ¦\84 â\8a¢ V1 â¬\88[Rt, cV, h] V2 & â¬\86*[1] V2 â\89\98 T2 &
+ L = K.ⓛV1 & c = cV+𝟘𝟙.
+#Rt #c #h #G #L #T2 #H
elim (cpg_inv_atom1 … H) -H * /3 width=1 by or3_intro0, conj/
[ #s #H destruct
|2,3: #cV #K #V1 #V2 #HV12 #HVT2 #H1 #_ #H2 destruct /3 width=8 by or3_intro1, or3_intro2, ex4_4_intro/
-| #I #K #V1 #V2 #i #_ #_ #_ #H destruct
+| #I #K #T #i #_ #_ #_ #H destruct
]
qed-.
-lemma cpg_inv_lref1: ∀c,h,G,L,T2,i. ⦃G, L⦄ ⊢ #⫯i ➡[c, h] T2 →
- (T2 = #(⫯i) ∧ c = 𝟘𝟘) ∨
- ∃∃I,K,V,T. ⦃G, K⦄ ⊢ #i ➡[c, h] T & ⬆*[1] T ≡ T2 & L = K.ⓑ{I}V.
-#c #h #G #L #T2 #i #H
+lemma cpg_inv_lref1: ∀Rt,c,h,G,L,T2,i. ⦃G, L⦄ ⊢ #↑i ⬈[Rt, c, h] T2 →
+ ∨∨ T2 = #(↑i) ∧ c = 𝟘𝟘
+ | ∃∃I,K,T. ⦃G, K⦄ ⊢ #i ⬈[Rt, c, h] T & ⬆*[1] T ≘ T2 & L = K.ⓘ{I}.
+#Rt #c #h #G #L #T2 #i #H
elim (cpg_inv_atom1 … H) -H * /3 width=1 by or_introl, conj/
[ #s #H destruct
|2,3: #cV #K #V1 #V2 #_ #_ #_ #H destruct
-| #I #K #V1 #V2 #j #HV2 #HVT2 #H1 #H2 destruct /3 width=7 by ex3_4_intro, or_intror/
+| #I #K #T #j #HT #HT2 #H1 #H2 destruct /3 width=6 by ex3_3_intro, or_intror/
]
qed-.
-lemma cpg_inv_gref1: ∀c,h,G,L,T2,l. ⦃G, L⦄ ⊢ §l ➡[c, h] T2 → T2 = §l ∧ c = 𝟘𝟘.
-#c #h #G #L #T2 #l #H
+lemma cpg_inv_gref1: ∀Rt,c,h,G,L,T2,l. ⦃G, L⦄ ⊢ §l ⬈[Rt, c, h] T2 → T2 = §l ∧ c = 𝟘𝟘.
+#Rt #c #h #G #L #T2 #l #H
elim (cpg_inv_atom1 … H) -H * /2 width=1 by conj/
[ #s #H destruct
|2,3: #cV #K #V1 #V2 #_ #_ #_ #H destruct
-| #I #K #V1 #V2 #i #_ #_ #_ #H destruct
+| #I #K #T #i #_ #_ #_ #H destruct
]
qed-.
-fact cpg_inv_bind1_aux: ∀c,h,G,L,U,U2. ⦃G, L⦄ ⊢ U ➡[c, h] U2 →
- ∀p,J,V1,U1. U = ⓑ{p,J}V1.U1 → (
- ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L.ⓑ{J}V1⦄ ⊢ U1 ➡[cT, h] T2 &
- U2 = ⓑ{p,J}V2.T2 & c = (↓cV)+cT
- ) ∨
- ∃∃cT,T. ⦃G, L.ⓓV1⦄ ⊢ U1 ➡[cT, h] T & ⬆*[1] U2 ≡ T &
- p = true & J = Abbr & c = (↓cT)+𝟙𝟘.
-#c #h #G #L #U #U2 * -c -G -L -U -U2
+fact cpg_inv_bind1_aux: ∀Rt,c,h,G,L,U,U2. ⦃G, L⦄ ⊢ U ⬈[Rt, c, h] U2 →
+ ∀p,J,V1,U1. U = ⓑ{p,J}V1.U1 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L.ⓑ{J}V1⦄ ⊢ U1 ⬈[Rt, cT, h] T2 &
+ U2 = ⓑ{p,J}V2.T2 & c = ((↕*cV)∨cT)
+ | ∃∃cT,T. ⦃G, L.ⓓV1⦄ ⊢ U1 ⬈[Rt, cT, h] T & ⬆*[1] U2 ≘ T &
+ p = true & J = Abbr & c = cT+𝟙𝟘.
+#Rt #c #h #G #L #U #U2 * -c -G -L -U -U2
[ #I #G #L #q #J #W #U1 #H destruct
| #G #L #s #q #J #W #U1 #H destruct
| #c #G #L #V1 #V2 #W2 #_ #_ #q #J #W #U1 #H destruct
| #c #G #L #V1 #V2 #W2 #_ #_ #q #J #W #U1 #H destruct
-| #c #I #G #L #V #T #U #i #_ #_ #q #J #W #U1 #H destruct
-| #rv #cT #p #I #G #L #V1 #V2 #T1 #T2 #HV12 #HT12 #q #J #W #U1 #H destruct /3 width=8 by ex4_4_intro, or_introl/
-| #rv #cT #I #G #L #V1 #V2 #T1 #T2 #_ #_ #q #J #W #U1 #H destruct
+| #c #I #G #L #T #U #i #_ #_ #q #J #W #U1 #H destruct
+| #cV #cT #p #I #G #L #V1 #V2 #T1 #T2 #HV12 #HT12 #q #J #W #U1 #H destruct /3 width=8 by ex4_4_intro, or_introl/
+| #cV #cT #G #L #V1 #V2 #T1 #T2 #_ #_ #q #J #W #U1 #H destruct
+| #cU #cT #G #L #U1 #U2 #T1 #T2 #_ #_ #_ #q #J #W #U1 #H destruct
| #c #G #L #V #T1 #T #T2 #HT1 #HT2 #q #J #W #U1 #H destruct /3 width=5 by ex5_2_intro, or_intror/
| #c #G #L #V #T1 #T2 #_ #q #J #W #U1 #H destruct
| #c #G #L #V1 #V2 #T #_ #q #J #W #U1 #H destruct
-| #rv #cW #cT #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #q #J #W #U1 #H destruct
-| #rv #cW #cT #p #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #_ #q #J #W #U1 #H destruct
+| #cV #cW #cT #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #q #J #W #U1 #H destruct
+| #cV #cW #cT #p #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #_ #q #J #W #U1 #H destruct
]
qed-.
-lemma cpg_inv_bind1: ∀c,h,p,I,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ➡[c, h] U2 → (
- ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ➡[cT, h] T2 &
- U2 = ⓑ{p,I}V2.T2 & c = (↓cV)+cT
- ) ∨
- ∃∃cT,T. ⦃G, L.ⓓV1⦄ ⊢ T1 ➡[cT, h] T & ⬆*[1] U2 ≡ T &
- p = true & I = Abbr & c = (↓cT)+𝟙𝟘.
+lemma cpg_inv_bind1: ∀Rt,c,h,p,I,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ⬈[Rt, c, h] U2 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L.ⓑ{I}V1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
+ U2 = ⓑ{p,I}V2.T2 & c = ((↕*cV)∨cT)
+ | ∃∃cT,T. ⦃G, L.ⓓV1⦄ ⊢ T1 ⬈[Rt, cT, h] T & ⬆*[1] U2 ≘ T &
+ p = true & I = Abbr & c = cT+𝟙𝟘.
/2 width=3 by cpg_inv_bind1_aux/ qed-.
-lemma cpg_inv_abbr1: ∀c,h,p,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓓ{p}V1.T1 ➡[c, h] U2 → (
- ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L.ⓓV1⦄ ⊢ T1 ➡[cT, h] T2 &
- U2 = ⓓ{p}V2.T2 & c = (↓cV)+cT
- ) ∨
- ∃∃cT,T. ⦃G, L.ⓓV1⦄ ⊢ T1 ➡[cT, h] T & ⬆*[1] U2 ≡ T &
- p = true & c = (↓cT)+𝟙𝟘.
-#c #h #p #G #L #V1 #T1 #U2 #H elim (cpg_inv_bind1 … H) -H *
+lemma cpg_inv_abbr1: ∀Rt,c,h,p,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓓ{p}V1.T1 ⬈[Rt, c, h] U2 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L.ⓓV1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
+ U2 = ⓓ{p}V2.T2 & c = ((↕*cV)∨cT)
+ | ∃∃cT,T. ⦃G, L.ⓓV1⦄ ⊢ T1 ⬈[Rt, cT, h] T & ⬆*[1] U2 ≘ T &
+ p = true & c = cT+𝟙𝟘.
+#Rt #c #h #p #G #L #V1 #T1 #U2 #H elim (cpg_inv_bind1 … H) -H *
/3 width=8 by ex4_4_intro, ex4_2_intro, or_introl, or_intror/
qed-.
-lemma cpg_inv_abst1: ∀c,h,p,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓛ{p}V1.T1 ➡[c, h] U2 →
- â\88\83â\88\83cV,cT,V2,T2. â¦\83G, Lâ¦\84 â\8a¢ V1 â\9e¡[cV, h] V2 & â¦\83G, L.â\93\9bV1â¦\84 â\8a¢ T1 â\9e¡[cT, h] T2 &
- U2 = ⓛ{p}V2.T2 & c = (↓cV)+cT.
-#c #h #p #G #L #V1 #T1 #U2 #H elim (cpg_inv_bind1 … H) -H *
+lemma cpg_inv_abst1: ∀Rt,c,h,p,G,L,V1,T1,U2. ⦃G, L⦄ ⊢ ⓛ{p}V1.T1 ⬈[Rt, c, h] U2 →
+ â\88\83â\88\83cV,cT,V2,T2. â¦\83G, Lâ¦\84 â\8a¢ V1 â¬\88[Rt, cV, h] V2 & â¦\83G, L.â\93\9bV1â¦\84 â\8a¢ T1 â¬\88[Rt, cT, h] T2 &
+ U2 = ⓛ{p}V2.T2 & c = ((↕*cV)∨cT).
+#Rt #c #h #p #G #L #V1 #T1 #U2 #H elim (cpg_inv_bind1 … H) -H *
[ /3 width=8 by ex4_4_intro/
| #c #T #_ #_ #_ #H destruct
]
qed-.
-fact cpg_inv_flat1_aux: ∀c,h,G,L,U,U2. ⦃G, L⦄ ⊢ U ➡[c, h] U2 →
- ∀J,V1,U1. U = ⓕ{J}V1.U1 →
- ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L⦄ ⊢ U1 ➡[cT, h] T2 &
- U2 = ⓕ{J}V2.T2 & c = (↓cV)+cT
- | ∃∃cT. ⦃G, L⦄ ⊢ U1 ➡[cT, h] U2 & J = Cast & c = (↓cT)+𝟙𝟘
- | ∃∃cV. ⦃G, L⦄ ⊢ V1 ➡[cV, h] U2 & J = Cast & c = (↓cV)+𝟘𝟙
- | ∃∃cV,cW,cT,p,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L⦄ ⊢ W1 ➡[cW, h] W2 & ⦃G, L.ⓛW1⦄ ⊢ T1 ➡[cT, h] T2 &
- J = Appl & U1 = ⓛ{p}W1.T1 & U2 = ⓓ{p}ⓝW2.V2.T2 & c = (↓cV)+(↓cW)+(↓cT)+𝟙𝟘
- | ∃∃cV,cW,cT,p,V,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V & ⬆*[1] V ≡ V2 & ⦃G, L⦄ ⊢ W1 ➡[cW, h] W2 & ⦃G, L.ⓓW1⦄ ⊢ T1 ➡[cT, h] T2 &
- J = Appl & U1 = ⓓ{p}W1.T1 & U2 = ⓓ{p}W2.ⓐV2.T2 & c = (↓cV)+(↓cW)+(↓cT)+𝟙𝟘.
-#c #h #G #L #U #U2 * -c -G -L -U -U2
-[ #I #G #L #J #W #U1 #H destruct
-| #G #L #s #J #W #U1 #H destruct
-| #c #G #L #V1 #V2 #W2 #_ #_ #J #W #U1 #H destruct
-| #c #G #L #V1 #V2 #W2 #_ #_ #J #W #U1 #H destruct
-| #c #I #G #L #V #T #U #i #_ #_ #J #W #U1 #H destruct
-| #rv #cT #p #I #G #L #V1 #V2 #T1 #T2 #_ #_ #J #W #U1 #H destruct
-| #rv #cT #I #G #L #V1 #V2 #T1 #T2 #HV12 #HT12 #J #W #U1 #H destruct /3 width=8 by or5_intro0, ex4_4_intro/
-| #c #G #L #V #T1 #T #T2 #_ #_ #J #W #U1 #H destruct
-| #c #G #L #V #T1 #T2 #HT12 #J #W #U1 #H destruct /3 width=3 by or5_intro1, ex3_intro/
-| #c #G #L #V1 #V2 #T #HV12 #J #W #U1 #H destruct /3 width=3 by or5_intro2, ex3_intro/
-| #rv #cW #cT #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 #HV12 #HW12 #HT12 #J #W #U1 #H destruct /3 width=15 by or5_intro3, ex7_9_intro/
-| #rv #cW #cT #p #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #HV1 #HV2 #HW12 #HT12 #J #W #U1 #H destruct /3 width=17 by or5_intro4, ex8_10_intro/
+fact cpg_inv_appl1_aux: ∀Rt,c,h,G,L,U,U2. ⦃G, L⦄ ⊢ U ⬈[Rt, c, h] U2 →
+ ∀V1,U1. U = ⓐV1.U1 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L⦄ ⊢ U1 ⬈[Rt, cT, h] T2 &
+ U2 = ⓐV2.T2 & c = ((↕*cV)∨cT)
+ | ∃∃cV,cW,cT,p,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L⦄ ⊢ W1 ⬈[Rt, cW, h] W2 & ⦃G, L.ⓛW1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
+ U1 = ⓛ{p}W1.T1 & U2 = ⓓ{p}ⓝW2.V2.T2 & c = ((↕*cV)∨(↕*cW)∨cT)+𝟙𝟘
+ | ∃∃cV,cW,cT,p,V,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V & ⬆*[1] V ≘ V2 & ⦃G, L⦄ ⊢ W1 ⬈[Rt, cW, h] W2 & ⦃G, L.ⓓW1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
+ U1 = ⓓ{p}W1.T1 & U2 = ⓓ{p}W2.ⓐV2.T2 & c = ((↕*cV)∨(↕*cW)∨cT)+𝟙𝟘.
+#Rt #c #h #G #L #U #U2 * -c -G -L -U -U2
+[ #I #G #L #W #U1 #H destruct
+| #G #L #s #W #U1 #H destruct
+| #c #G #L #V1 #V2 #W2 #_ #_ #W #U1 #H destruct
+| #c #G #L #V1 #V2 #W2 #_ #_ #W #U1 #H destruct
+| #c #I #G #L #T #U #i #_ #_ #W #U1 #H destruct
+| #cV #cT #p #I #G #L #V1 #V2 #T1 #T2 #_ #_ #W #U1 #H destruct
+| #cV #cT #G #L #V1 #V2 #T1 #T2 #HV12 #HT12 #W #U1 #H destruct /3 width=8 by or3_intro0, ex4_4_intro/
+| #cV #cT #G #L #V1 #V2 #T1 #T2 #_ #_ #_ #W #U1 #H destruct
+| #c #G #L #V #T1 #T #T2 #_ #_ #W #U1 #H destruct
+| #c #G #L #V #T1 #T2 #_ #W #U1 #H destruct
+| #c #G #L #V1 #V2 #T #_ #W #U1 #H destruct
+| #cV #cW #cT #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 #HV12 #HW12 #HT12 #W #U1 #H destruct /3 width=15 by or3_intro1, ex6_9_intro/
+| #cV #cW #cT #p #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #HV1 #HV2 #HW12 #HT12 #W #U1 #H destruct /3 width=17 by or3_intro2, ex7_10_intro/
]
qed-.
-lemma cpg_inv_flat1: ∀c,h,I,G,L,V1,U1,U2. ⦃G, L⦄ ⊢ ⓕ{I}V1.U1 ➡[c, h] U2 →
- ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L⦄ ⊢ U1 ➡[cT, h] T2 &
- U2 = ⓕ{I}V2.T2 & c = (↓cV)+cT
- | ∃∃cT. ⦃G, L⦄ ⊢ U1 ➡[cT, h] U2 & I = Cast & c = (↓cT)+𝟙𝟘
- | ∃∃cV. ⦃G, L⦄ ⊢ V1 ➡[cV, h] U2 & I = Cast & c = (↓cV)+𝟘𝟙
- | ∃∃cV,cW,cT,p,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L⦄ ⊢ W1 ➡[cW, h] W2 & ⦃G, L.ⓛW1⦄ ⊢ T1 ➡[cT, h] T2 &
- I = Appl & U1 = ⓛ{p}W1.T1 & U2 = ⓓ{p}ⓝW2.V2.T2 & c = (↓cV)+(↓cW)+(↓cT)+𝟙𝟘
- | ∃∃cV,cW,cT,p,V,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V & ⬆*[1] V ≡ V2 & ⦃G, L⦄ ⊢ W1 ➡[cW, h] W2 & ⦃G, L.ⓓW1⦄ ⊢ T1 ➡[cT, h] T2 &
- I = Appl & U1 = ⓓ{p}W1.T1 & U2 = ⓓ{p}W2.ⓐV2.T2 & c = (↓cV)+(↓cW)+(↓cT)+𝟙𝟘.
-/2 width=3 by cpg_inv_flat1_aux/ qed-.
+lemma cpg_inv_appl1: ∀Rt,c,h,G,L,V1,U1,U2. ⦃G, L⦄ ⊢ ⓐV1.U1 ⬈[Rt, c, h] U2 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L⦄ ⊢ U1 ⬈[Rt, cT, h] T2 &
+ U2 = ⓐV2.T2 & c = ((↕*cV)∨cT)
+ | ∃∃cV,cW,cT,p,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L⦄ ⊢ W1 ⬈[Rt, cW, h] W2 & ⦃G, L.ⓛW1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
+ U1 = ⓛ{p}W1.T1 & U2 = ⓓ{p}ⓝW2.V2.T2 & c = ((↕*cV)∨(↕*cW)∨cT)+𝟙𝟘
+ | ∃∃cV,cW,cT,p,V,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V & ⬆*[1] V ≘ V2 & ⦃G, L⦄ ⊢ W1 ⬈[Rt, cW, h] W2 & ⦃G, L.ⓓW1⦄ ⊢ T1 ⬈[Rt, cT, h] T2 &
+ U1 = ⓓ{p}W1.T1 & U2 = ⓓ{p}W2.ⓐV2.T2 & c = ((↕*cV)∨(↕*cW)∨cT)+𝟙𝟘.
+/2 width=3 by cpg_inv_appl1_aux/ qed-.
-lemma cpg_inv_appl1: ∀c,h,G,L,V1,U1,U2. ⦃G, L⦄ ⊢ ⓐV1.U1 ➡[c, h] U2 →
- ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L⦄ ⊢ U1 ➡[cT, h] T2 &
- U2 = ⓐV2.T2 & c = (↓cV)+cT
- | ∃∃cV,cW,cT,p,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L⦄ ⊢ W1 ➡[cW, h] W2 & ⦃G, L.ⓛW1⦄ ⊢ T1 ➡[cT, h] T2 &
- U1 = ⓛ{p}W1.T1 & U2 = ⓓ{p}ⓝW2.V2.T2 & c = (↓cV)+(↓cW)+(↓cT)+𝟙𝟘
- | ∃∃cV,cW,cT,p,V,V2,W1,W2,T1,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V & ⬆*[1] V ≡ V2 & ⦃G, L⦄ ⊢ W1 ➡[cW, h] W2 & ⦃G, L.ⓓW1⦄ ⊢ T1 ➡[cT, h] T2 &
- U1 = ⓓ{p}W1.T1 & U2 = ⓓ{p}W2.ⓐV2.T2 & c = (↓cV)+(↓cW)+(↓cT)+𝟙𝟘.
-#c #h #G #L #V1 #U1 #U2 #H elim (cpg_inv_flat1 … H) -H *
-[ /3 width=8 by or3_intro0, ex4_4_intro/
-|2,3: #c #_ #H destruct
-| /3 width=15 by or3_intro1, ex6_9_intro/
-| /3 width=17 by or3_intro2, ex7_10_intro/
+fact cpg_inv_cast1_aux: ∀Rt,c,h,G,L,U,U2. ⦃G, L⦄ ⊢ U ⬈[Rt, c, h] U2 →
+ ∀V1,U1. U = ⓝV1.U1 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L⦄ ⊢ U1 ⬈[Rt, cT, h] T2 &
+ Rt cV cT & U2 = ⓝV2.T2 & c = (cV∨cT)
+ | ∃∃cT. ⦃G, L⦄ ⊢ U1 ⬈[Rt, cT, h] U2 & c = cT+𝟙𝟘
+ | ∃∃cV. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] U2 & c = cV+𝟘𝟙.
+#Rt #c #h #G #L #U #U2 * -c -G -L -U -U2
+[ #I #G #L #W #U1 #H destruct
+| #G #L #s #W #U1 #H destruct
+| #c #G #L #V1 #V2 #W2 #_ #_ #W #U1 #H destruct
+| #c #G #L #V1 #V2 #W2 #_ #_ #W #U1 #H destruct
+| #c #I #G #L #T #U #i #_ #_ #W #U1 #H destruct
+| #cV #cT #p #I #G #L #V1 #V2 #T1 #T2 #_ #_ #W #U1 #H destruct
+| #cV #cT #G #L #V1 #V2 #T1 #T2 #_ #_ #W #U1 #H destruct
+| #cV #cT #G #L #V1 #V2 #T1 #T2 #HRt #HV12 #HT12 #W #U1 #H destruct /3 width=9 by or3_intro0, ex5_4_intro/
+| #c #G #L #V #T1 #T #T2 #_ #_ #W #U1 #H destruct
+| #c #G #L #V #T1 #T2 #HT12 #W #U1 #H destruct /3 width=3 by or3_intro1, ex2_intro/
+| #c #G #L #V1 #V2 #T #HV12 #W #U1 #H destruct /3 width=3 by or3_intro2, ex2_intro/
+| #cV #cW #cT #p #G #L #V1 #V2 #W1 #W2 #T1 #T2 #HV12 #HW12 #HT12 #W #U1 #H destruct
+| #cV #cW #cT #p #G #L #V1 #V #V2 #W1 #W2 #T1 #T2 #HV1 #HV2 #HW12 #HT12 #W #U1 #H destruct
]
qed-.
-lemma cpg_inv_cast1: ∀c,h,G,L,V1,U1,U2. ⦃G, L⦄ ⊢ ⓝV1.U1 ➡[c, h] U2 →
- ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ➡[cV, h] V2 & ⦃G, L⦄ ⊢ U1 ➡[cT, h] T2 &
- U2 = ⓝV2.T2 & c = (↓cV)+cT
- | ∃∃cT. ⦃G, L⦄ ⊢ U1 ➡[cT, h] U2 & c = (↓cT)+𝟙𝟘
- | ∃∃cV. ⦃G, L⦄ ⊢ V1 ➡[cV, h] U2 & c = (↓cV)+𝟘𝟙.
-#c #h #G #L #V1 #U1 #U2 #H elim (cpg_inv_flat1 … H) -H *
-[ /3 width=8 by or3_intro0, ex4_4_intro/
-|2,3: /3 width=3 by or3_intro1, or3_intro2, ex2_intro/
-| #rv #cW #cT #p #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #H destruct
-| #rv #cW #cT #p #V #V2 #W1 #W2 #T1 #T2 #_ #_ #_ #_ #H destruct
-]
+lemma cpg_inv_cast1: ∀Rt,c,h,G,L,V1,U1,U2. ⦃G, L⦄ ⊢ ⓝV1.U1 ⬈[Rt, c, h] U2 →
+ ∨∨ ∃∃cV,cT,V2,T2. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⦃G, L⦄ ⊢ U1 ⬈[Rt, cT, h] T2 &
+ Rt cV cT & U2 = ⓝV2.T2 & c = (cV∨cT)
+ | ∃∃cT. ⦃G, L⦄ ⊢ U1 ⬈[Rt, cT, h] U2 & c = cT+𝟙𝟘
+ | ∃∃cV. ⦃G, L⦄ ⊢ V1 ⬈[Rt, cV, h] U2 & c = cV+𝟘𝟙.
+/2 width=3 by cpg_inv_cast1_aux/ qed-.
+
+(* Advanced inversion lemmas ************************************************)
+
+lemma cpg_inv_zero1_pair: ∀Rt,c,h,I,G,K,V1,T2. ⦃G, K.ⓑ{I}V1⦄ ⊢ #0 ⬈[Rt, c, h] T2 →
+ ∨∨ T2 = #0 ∧ c = 𝟘𝟘
+ | ∃∃cV,V2. ⦃G, K⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⬆*[1] V2 ≘ T2 &
+ I = Abbr & c = cV
+ | ∃∃cV,V2. ⦃G, K⦄ ⊢ V1 ⬈[Rt, cV, h] V2 & ⬆*[1] V2 ≘ T2 &
+ I = Abst & c = cV+𝟘𝟙.
+#Rt #c #h #I #G #K #V1 #T2 #H elim (cpg_inv_zero1 … H) -H /2 width=1 by or3_intro0/
+* #z #Y #X1 #X2 #HX12 #HXT2 #H1 #H2 destruct /3 width=5 by or3_intro1, or3_intro2, ex4_2_intro/
+qed-.
+
+lemma cpg_inv_lref1_bind: ∀Rt,c,h,I,G,K,T2,i. ⦃G, K.ⓘ{I}⦄ ⊢ #↑i ⬈[Rt, c, h] T2 →
+ ∨∨ T2 = #(↑i) ∧ c = 𝟘𝟘
+ | ∃∃T. ⦃G, K⦄ ⊢ #i ⬈[Rt, c, h] T & ⬆*[1] T ≘ T2.
+#Rt #c #h #I #G #L #T2 #i #H elim (cpg_inv_lref1 … H) -H /2 width=1 by or_introl/
+* #Z #Y #T #HT #HT2 #H destruct /3 width=3 by ex2_intro, or_intror/
qed-.
(* Basic forward lemmas *****************************************************)
-lemma cpg_fwd_bind1_minus: ∀c,h,I,G,L,V1,T1,T. ⦃G, L⦄ ⊢ -ⓑ{I}V1.T1 ➡[c, h] T → ∀b.
- ∃∃V2,T2. ⦃G, L⦄ ⊢ ⓑ{b,I}V1.T1 ➡[c, h] ⓑ{b,I}V2.T2 &
+lemma cpg_fwd_bind1_minus: ∀Rt,c,h,I,G,L,V1,T1,T. ⦃G, L⦄ ⊢ -ⓑ{I}V1.T1 ⬈[Rt, c, h] T → ∀p.
+ ∃∃V2,T2. ⦃G, L⦄ ⊢ ⓑ{p,I}V1.T1 ⬈[Rt, c, h] ⓑ{p,I}V2.T2 &
T = -ⓑ{I}V2.T2.
-#c #h #I #G #L #V1 #T1 #T #H #b elim (cpg_inv_bind1 … H) -H *
+#Rt #c #h #I #G #L #V1 #T1 #T #H #p elim (cpg_inv_bind1 … H) -H *
[ #cV #cT #V2 #T2 #HV12 #HT12 #H1 #H2 destruct /3 width=4 by cpg_bind, ex2_2_intro/
| #c #T2 #_ #_ #H destruct
]
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