- first results on cpx (dericed from those on cpg)

[helm.git] / matita / matita / contribs / lambdadelta / basic_2 / rt_transition / cpg_drops.ma

diff --git a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cpg_drops.ma b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cpg_drops.ma
index 4ccf66fdfa32ea49c65e90627b36a7a72d5b6578..c8f0b394fe60de960335be39bbc76192b28d8706 100644 (file)
--- a/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cpg_drops.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/rt_transition/cpg_drops.ma
@@ -17,12 +17,12 @@ include "basic_2/s_computation/fqup_weight.ma".
 include "basic_2/s_computation/fqup_drops.ma".
 include "basic_2/rt_transition/cpg.ma".
 
-(* CONTEXT-SENSITIVE GENERIC PARALLEL RT-TRANSITION FOR TERMS ***************)
+(* COUNTED CONTEXT-SENSITIVE PARALLEL RT-TRANSITION FOR TERMS ***************)
 
 (* Advanced properties ******************************************************)
 
 lemma cpg_delta_drops: ∀c,h,G,K,V,V2,i,L,T2. ⬇*[i] L ≡ K.ⓓV → ⦃G, K⦄ ⊢ V ➡[c, h] V2 →
-                       ⬆*[⫯i] V2 ≡ T2 →  ⦃G, L⦄ ⊢ #i ➡[↓c, h] T2.
+                       ⬆*[⫯i] V2 ≡ T2 →  ⦃G, L⦄ ⊢ #i ➡[c, h] T2.
 #c #h #G #K #V #V2 #i elim i -i
 [ #L #T2 #HLK lapply (drops_fwd_isid … HLK ?) // #H destruct /3 width=3 by cpg_delta/
 | #i #IH #L0 #T0 #H0 #HV2 #HVT2
@@ -46,7 +46,7 @@ qed.
 lemma cpg_inv_lref1_drops: ∀c,h,G,i,L,T2. ⦃G, L⦄ ⊢ #i ➡[c, h] T2 →
                            ∨∨ T2 = #i ∧ c = 𝟘𝟘
                             | ∃∃cV,K,V,V2. ⬇*[i] L ≡ K.ⓓV & ⦃G, K⦄ ⊢ V ➡[cV, h] V2 &
-                                           ⬆*[⫯i] V2 ≡ T2 & c = ↓cV
+                                           ⬆*[⫯i] V2 ≡ T2 & c = cV
                             | ∃∃cV,K,V,V2. ⬇*[i] L ≡ K.ⓛV & ⦃G, K⦄ ⊢ V ➡[cV, h] V2 &
                                            ⬆*[⫯i] V2 ≡ T2 & c = (↓cV) + 𝟘𝟙.
 #c #h #G #i elim i -i
@@ -61,6 +61,23 @@ lemma cpg_inv_lref1_drops: ∀c,h,G,i,L,T2. ⦃G, L⦄ ⊢ #i ➡[c, h] T2 →
 ]
 qed-.
 
+lemma cpg_inv_atom1_drops: ∀c,h,I,G,L,T2. ⦃G, L⦄ ⊢ ⓪{I} ➡[c, h] T2 →
+                           ∨∨ T2 = ⓪{I} ∧ c = 𝟘𝟘
+                            | ∃∃s. T2 = ⋆(next h s) & I = Sort s & c = 𝟘𝟙
+                            | ∃∃cV,i,K,V,V2. ⬇*[i] L ≡ K.ⓓV & ⦃G, K⦄ ⊢ V ➡[cV, h] V2 &
+                                             ⬆*[⫯i] V2 ≡ T2 & I = LRef i & c = cV
+                            | ∃∃cV,i,K,V,V2. ⬇*[i] L ≡ K.ⓛV & ⦃G, K⦄ ⊢ V ➡[cV, h] V2 &
+                                             ⬆*[⫯i] V2 ≡ T2 & I = LRef i & c = (↓cV) + 𝟘𝟙.
+#c #h * #n #G #L #T2 #H
+[ elim (cpg_inv_sort1 … H) -H *
+  /3 width=3 by or4_intro0, or4_intro1, ex3_intro, conj/
+| elim (cpg_inv_lref1_drops … H) -H *
+  /3 width=10 by or4_intro0, or4_intro2, or4_intro3, ex5_5_intro, conj/
+| elim (cpg_inv_gref1 … H) -H
+  /3 width=1 by or4_intro0, conj/
+]
+qed-.
+
 (* Properties with generic slicing for local environments *******************)
 
 lemma cpg_lifts: ∀c,h,G. d_liftable2 (cpg h c G).
@@ -135,7 +152,7 @@ qed-.
 
 (* Inversion lemmas with generic slicing for local environments *************)
 
-lemma cpg_inv_lift1: ∀c,h,G. d_deliftable2_sn (cpg h c G).
+lemma cpg_inv_lifts1: ∀c,h,G. d_deliftable2_sn (cpg h c G).
 #c #h #G #L #U generalize in match c; -c
 @(fqup_wf_ind_eq … G L U) -G -L -U #G0 #L0 #U0 #IH #G #L * *
 [ #s #HG #HL #HU #c #X2 #H2 #b #f #K #HLK #X1 #H1 destruct -IH