include "basic_2/rt_computation/cpxs_cpxs.ma".
include "basic_2/rt_computation/csx_csx.ma".
-(* UNBOUND CONTEXT-SENSITIVE PARALLEL RT-COMPUTATION FOR TERMS **************)
+(* STRONGLY NORMALIZING TERMS FOR EXTENDED PARALLEL RT-TRANSITION ***********)
-(* Properties with unbound context-sensitive rt-computation for terms *******)
+(* Properties with extended context-sensitive rt-computation for terms ******)
(* Basic_1: was just: sn3_intro *)
-lemma csx_intro_cpxs: ∀h,G,L,T1.
- (∀T2. ❪G,L❫ ⊢ T1 ⬈*[h] T2 → (T1 ≛ T2 → ⊥) → ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T2❫) →
- ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T1❫.
+lemma csx_intro_cpxs (G) (L):
+ ∀T1. (∀T2. ❪G,L❫ ⊢ T1 ⬈* T2 → (T1 ≛ T2 → ⊥) → ❪G,L❫ ⊢ ⬈*𝐒 T2) →
+ ❪G,L❫ ⊢ ⬈*𝐒 T1.
/4 width=1 by cpx_cpxs, csx_intro/ qed-.
(* Basic_1: was just: sn3_pr3_trans *)
-lemma csx_cpxs_trans: ∀h,G,L,T1. ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T1❫ →
- ∀T2. ❪G,L❫ ⊢ T1 ⬈*[h] T2 → ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T2❫.
-#h #G #L #T1 #HT1 #T2 #H @(cpxs_ind … H) -T2
+lemma csx_cpxs_trans (G) (L):
+ ∀T1. ❪G,L❫ ⊢ ⬈*𝐒 T1 →
+ ∀T2. ❪G,L❫ ⊢ T1 ⬈* T2 → ❪G,L❫ ⊢ ⬈*𝐒 T2.
+#G #L #T1 #HT1 #T2 #H @(cpxs_ind … H) -T2
/2 width=3 by csx_cpx_trans/
qed-.
-(* Eliminators with unbound context-sensitive rt-computation for terms ******)
+(* Eliminators with extended context-sensitive rt-computation for terms *****)
-lemma csx_ind_cpxs_teqx: ∀h,G,L. ∀Q:predicate term.
- (∀T1. ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T1❫ →
- (∀T2. ❪G,L❫ ⊢ T1 ⬈*[h] T2 → (T1 ≛ T2 → ⊥) → Q T2) → Q T1
- ) →
- ∀T1. ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T1❫ →
- ∀T0. ❪G,L❫ ⊢ T1 ⬈*[h] T0 → ∀T2. T0 ≛ T2 → Q T2.
-#h #G #L #Q #IH #T1 #H @(csx_ind … H) -T1
-#T1 #HT1 #IH1 #T0 #HT10 #T2 #HT02
-@IH -IH /3 width=3 by csx_cpxs_trans, csx_teqx_trans/ -HT1 #V2 #HTV2 #HnTV2
-lapply (teqx_tneqx_trans … HT02 … HnTV2) -HnTV2 #H
-elim (teqx_cpxs_trans … HT02 … HTV2) -T2 #V0 #HTV0 #HV02
-lapply (tneqx_teqx_canc_dx … H … HV02) -H #HnTV0
-elim (teqx_dec T1 T0) #H
-[ lapply (teqx_tneqx_trans … H … HnTV0) -H -HnTV0 #Hn10
- lapply (cpxs_trans … HT10 … HTV0) -T0 #H10
- elim (cpxs_tneqx_fwd_step_sn … H10 … Hn10) -H10 -Hn10
- /3 width=8 by teqx_trans/
-| elim (cpxs_tneqx_fwd_step_sn … HT10 … H) -HT10 -H #T #V #HT1 #HnT1 #HTV #HVT0
- elim (teqx_cpxs_trans … HVT0 … HTV0) -T0
- /3 width=8 by cpxs_trans, teqx_trans/
+fact csx_ind_cpxs_aux (G) (L):
+ ∀Q:predicate term.
+ (∀T1. ❪G,L❫ ⊢ ⬈*𝐒 T1 →
+ (∀T2. ❪G,L❫ ⊢ T1 ⬈* T2 → (T1 ≛ T2 → ⊥) → Q T2) → Q T1
+ ) →
+ ∀T1. ❪G,L❫ ⊢ ⬈*𝐒 T1 →
+ ∀T2. ❪G,L❫ ⊢ T1 ⬈* T2 → Q T2.
+#G #L #Q #IH #T1 #H @(csx_ind … H) -T1
+#T1 #HT1 #IH1 #T2 #HT12
+@IH -IH /2 width=3 by csx_cpxs_trans/ -HT1 #V2 #HTV2 #HnTV2
+elim (teqx_dec T1 T2) #H
+[ lapply (teqx_tneqx_trans … H … HnTV2) -H -HnTV2 #Hn12
+ lapply (cpxs_trans … HT12 … HTV2) -T2 #H12
+ elim (cpxs_tneqx_fwd_step_sn … H12 … Hn12) -H12 -Hn12
+ /3 width=4 by/
+| elim (cpxs_tneqx_fwd_step_sn … HT12 … H) -HT12 -H
+ /3 width=6 by cpxs_trans/
]
qed-.
(* Basic_2A1: was: csx_ind_alt *)
-lemma csx_ind_cpxs: ∀h,G,L. ∀Q:predicate term.
- (∀T1. ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T1❫ →
- (∀T2. ❪G,L❫ ⊢ T1 ⬈*[h] T2 → (T1 ≛ T2 → ⊥) → Q T2) → Q T1
- ) →
- ∀T. ❪G,L❫ ⊢ ⬈*[h] 𝐒❪T❫ → Q T.
-#h #G #L #Q #IH #T #HT
-@(csx_ind_cpxs_teqx … IH … HT) -IH -HT // (**) (* full auto fails *)
+lemma csx_ind_cpxs (G) (L) (Q:predicate …):
+ (∀T1. ❪G,L❫ ⊢ ⬈*𝐒 T1 →
+ (∀T2. ❪G,L❫ ⊢ T1 ⬈* T2 → (T1 ≛ T2 → ⊥) → Q T2) → Q T1
+ ) →
+ ∀T. ❪G,L❫ ⊢ ⬈*𝐒 T → Q T.
+#G #L #Q #IH #T #HT
+@(csx_ind_cpxs_aux … IH … HT) -IH -HT // (**) (* full auto fails *)
qed-.