X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fmatita%2Fcontribs%2Flambdadelta%2Fbasic_2%2Frelocation%2Flex.ma;h=7e6aeae497657e6919a0c11dd56e1ce59573c18c;hp=3067deb2a536970a2ae68324c4c871e37448571b;hb=222044da28742b24584549ba86b1805a87def070;hpb=d7c5846e4a362a366f5600d079e08f8a75b9d566

diff --git a/matita/matita/contribs/lambdadelta/basic_2/relocation/lex.ma b/matita/matita/contribs/lambdadelta/basic_2/relocation/lex.ma
index 3067deb2a..7e6aeae49 100644
--- a/matita/matita/contribs/lambdadelta/basic_2/relocation/lex.ma
+++ b/matita/matita/contribs/lambdadelta/basic_2/relocation/lex.ma
@@ -12,64 +12,151 @@
 (*                                                                        *)
 (**************************************************************************)
 
+include "ground_2/pull/pull_2.ma".
+include "ground_2/pull/pull_4.ma".
 include "ground_2/relocation/rtmap_uni.ma".
 include "basic_2/notation/relations/relation_3.ma".
 include "basic_2/syntax/cext2.ma".
-include "basic_2/relocation/lexs.ma".
+include "basic_2/relocation/sex.ma".
 
-(* GENERIC EXTENSION OF A CONTEXT-SENSITIVE REALTION ON TERMS ***************)
+(* GENERIC EXTENSION OF A CONTEXT-SENSITIVE REALTION FOR TERMS **************)
 
-(* Basic_2A1: includes: lpx_sn_atom lpx_sn_pair *)
-definition lex: (lenv → relation term) → relation lenv ≝
-                λR,L1,L2. ∃∃f. 𝐈⦃f⦄ & L1 ⪤*[cfull, cext2 R, f] L2.
+definition lex (R): relation lenv ≝
+                    λL1,L2. ∃∃f. 𝐈⦃f⦄ & L1 ⪤[cfull, cext2 R, f] L2.
 
 interpretation "generic extension (local environment)"
    'Relation R L1 L2 = (lex R L1 L2).
 
+definition lex_confluent: relation (relation3 …) ≝ λR1,R2.
+                          ∀L0,T0,T1. R1 L0 T0 T1 → ∀T2. R2 L0 T0 T2 →
+                          ∀L1. L0 ⪤[R1] L1 → ∀L2. L0 ⪤[R2] L2 →
+                          ∃∃T. R2 L1 T1 T & R1 L2 T2 T.
+
+definition lex_transitive: relation (relation3 …) ≝ λR1,R2.
+                           ∀L1,T1,T. R1 L1 T1 T → ∀L2. L1 ⪤[R1] L2 →
+                           ∀T2. R2 L2 T T2 → R1 L1 T1 T2.
+
 (* Basic properties *********************************************************)
 
+(* Basic_2A1: was: lpx_sn_atom *)
+lemma lex_atom (R): ⋆ ⪤[R] ⋆.
+/2 width=3 by sex_atom, ex2_intro/ qed.
+
+lemma lex_bind (R): ∀I1,I2,K1,K2. K1 ⪤[R] K2 → cext2 R K1 I1 I2 →
+                    K1.ⓘ{I1} ⪤[R] K2.ⓘ{I2}.
+#R #I1 #I2 #K1 #K2 * #f #Hf #HK12 #HI12
+/3 width=3 by sex_push, isid_push, ex2_intro/
+qed.
+
 (* Basic_2A1: was: lpx_sn_refl *)
-lemma lex_refl: ∀R. c_reflexive … R → reflexive … (lex R).
-/4 width=3 by lexs_refl, ext2_refl, ex2_intro/ qed.
+lemma lex_refl (R): c_reflexive … R → reflexive … (lex R).
+/4 width=3 by sex_refl, ext2_refl, ex2_intro/ qed.
+
+lemma lex_co (R1) (R2): (∀L,T1,T2. R1 L T1 T2 → R2 L T1 T2) →
+                        ∀L1,L2. L1 ⪤[R1] L2 → L1 ⪤[R2] L2.
+#R1 #R2 #HR #L1 #L2 * /5 width=7 by sex_co, cext2_co, ex2_intro/
+qed-.
+
+(* Advanced properties ******************************************************)
+
+lemma lex_bind_refl_dx (R): c_reflexive … R →
+                            ∀I,K1,K2. K1 ⪤[R] K2 → K1.ⓘ{I} ⪤[R] K2.ⓘ{I}.
+/3 width=3 by ext2_refl, lex_bind/ qed.
+
+lemma lex_unit (R): ∀I,K1,K2. K1 ⪤[R] K2 → K1.ⓤ{I} ⪤[R] K2.ⓤ{I}.
+/3 width=1 by lex_bind, ext2_unit/ qed.
+
+(* Basic_2A1: was: lpx_sn_pair *)
+lemma lex_pair (R): ∀I,K1,K2,V1,V2. K1 ⪤[R] K2 → R K1 V1 V2 →
+                    K1.ⓑ{I}V1 ⪤[R] K2.ⓑ{I}V2.
+/3 width=1 by lex_bind, ext2_pair/ qed.
 
 (* Basic inversion lemmas ***************************************************)
 
 (* Basic_2A1: was: lpx_sn_inv_atom1: *)
-lemma lex_inv_atom_sn: ∀R,L2. ⋆ ⪤[R] L2 → L2 = ⋆.
-#R #L2 * #f #Hf #H >(lexs_inv_atom1 … H) -L2 //
+lemma lex_inv_atom_sn (R): ∀L2. ⋆ ⪤[R] L2 → L2 = ⋆.
+#R #L2 * #f #Hf #H >(sex_inv_atom1 … H) -L2 //
 qed-.
 
-(* Basic_2A1: was: lpx_sn_inv_pair1 *)
-lemma lex_inv_pair_sn: ∀R,I,L2,K1,V1. K1.ⓑ{I}V1 ⪤[R] L2 →
-                       ∃∃K2,V2. K1 ⪤[R] K2 & R K1 V1 V2 & L2 = K2.ⓑ{I}V2.
-#R #I #L2 #K1 #V1 * #f #Hf #H
-lapply (lexs_eq_repl_fwd … H (↑f) ?) -H /2 width=1 by eq_push_inv_isid/ #H
-elim (lexs_inv_push1 … H) -H #Z2 #K2 #HK12 #HZ2 #H destruct
-elim (ext2_inv_pair_sn … HZ2) -HZ2 #V2 #HV12 #H destruct
-/3 width=5 by ex3_2_intro, ex2_intro/
+lemma lex_inv_bind_sn (R): ∀I1,L2,K1. K1.ⓘ{I1} ⪤[R] L2 →
+                           ∃∃I2,K2. K1 ⪤[R] K2 & cext2 R K1 I1 I2 & L2 = K2.ⓘ{I2}.
+#R #I1 #L2 #K1 * #f #Hf #H
+lapply (sex_eq_repl_fwd … H (⫯f) ?) -H /2 width=1 by eq_push_inv_isid/ #H
+elim (sex_inv_push1 … H) -H #I2 #K2 #HK12 #HI12 #H destruct
+/3 width=5 by ex2_intro, ex3_2_intro/
 qed-.
 
 (* Basic_2A1: was: lpx_sn_inv_atom2 *)
-lemma lex_inv_atom_dx: ∀R,L1. L1 ⪤[R] ⋆ → L1 = ⋆.
-#R #L1 * #f #Hf #H >(lexs_inv_atom2 … H) -L1 //
+lemma lex_inv_atom_dx (R): ∀L1. L1 ⪤[R] ⋆ → L1 = ⋆.
+#R #L1 * #f #Hf #H >(sex_inv_atom2 … H) -L1 //
 qed-.
 
-(* Basic_2A1: was: lpx_sn_inv_pair2 *)
-lemma lex_inv_pair_dx: ∀R,I,L1,K2,V2. L1 ⪤[R] K2.ⓑ{I}V2 →
-                       ∃∃K1,V1. K1 ⪤[R] K2 & R K1 V1 V2 & L1 = K1.ⓑ{I}V1.
-#R #I #L1 #K2 #V2 * #f #Hf #H
-lapply (lexs_eq_repl_fwd … H (↑f) ?) -H /2 width=1 by eq_push_inv_isid/ #H
-elim (lexs_inv_push2 … H) -H #Z1 #K1 #HK12 #HZ1 #H destruct
-elim (ext2_inv_pair_dx … HZ1) -HZ1 #V1 #HV12 #H destruct
+lemma lex_inv_bind_dx (R): ∀I2,L1,K2. L1 ⪤[R] K2.ⓘ{I2} →
+                           ∃∃I1,K1. K1 ⪤[R] K2 & cext2 R K1 I1 I2 & L1 = K1.ⓘ{I1}.
+#R #I2 #L1 #K2 * #f #Hf #H
+lapply (sex_eq_repl_fwd … H (⫯f) ?) -H /2 width=1 by eq_push_inv_isid/ #H
+elim (sex_inv_push2 … H) -H #I1 #K1 #HK12 #HI12 #H destruct
 /3 width=5 by ex3_2_intro, ex2_intro/
 qed-.
 
 (* Advanced inversion lemmas ************************************************)
 
+lemma lex_inv_unit_sn (R): ∀I,L2,K1. K1.ⓤ{I} ⪤[R] L2 →
+                           ∃∃K2. K1 ⪤[R] K2 & L2 = K2.ⓤ{I}.
+#R #I #L2 #K1 #H
+elim (lex_inv_bind_sn … H) -H #Z2 #K2 #HK12 #HZ2 #H destruct
+elim (ext2_inv_unit_sn … HZ2) -HZ2
+/2 width=3 by ex2_intro/
+qed-.
+
+(* Basic_2A1: was: lpx_sn_inv_pair1 *)
+lemma lex_inv_pair_sn (R): ∀I,L2,K1,V1. K1.ⓑ{I}V1 ⪤[R] L2 →
+                           ∃∃K2,V2. K1 ⪤[R] K2 & R K1 V1 V2 & L2 = K2.ⓑ{I}V2.
+#R #I #L2 #K1 #V1 #H
+elim (lex_inv_bind_sn … H) -H #Z2 #K2 #HK12 #HZ2 #H destruct
+elim (ext2_inv_pair_sn … HZ2) -HZ2 #V2 #HV12 #H destruct
+/2 width=5 by ex3_2_intro/
+qed-.
+
+lemma lex_inv_unit_dx (R): ∀I,L1,K2. L1 ⪤[R] K2.ⓤ{I} →
+                           ∃∃K1. K1 ⪤[R] K2 & L1 = K1.ⓤ{I}.
+#R #I #L1 #K2 #H
+elim (lex_inv_bind_dx … H) -H #Z1 #K1 #HK12 #HZ1 #H destruct
+elim (ext2_inv_unit_dx … HZ1) -HZ1
+/2 width=3 by ex2_intro/
+qed-.
+
+(* Basic_2A1: was: lpx_sn_inv_pair2 *)
+lemma lex_inv_pair_dx (R): ∀I,L1,K2,V2. L1 ⪤[R] K2.ⓑ{I}V2 →
+                           ∃∃K1,V1. K1 ⪤[R] K2 & R K1 V1 V2 & L1 = K1.ⓑ{I}V1.
+#R #I #L1 #K2 #V2 #H
+elim (lex_inv_bind_dx … H) -H #Z1 #K1 #HK12 #HZ1 #H destruct
+elim (ext2_inv_pair_dx … HZ1) -HZ1 #V1 #HV12 #H destruct
+/2 width=5 by ex3_2_intro/
+qed-.
+
 (* Basic_2A1: was: lpx_sn_inv_pair *)
-lemma lex_inv_pair: ∀R,I1,I2,L1,L2,V1,V2.
-                    L1.ⓑ{I1}V1 ⪤[R] L2.ⓑ{I2}V2 →
-                    ∧∧ L1 ⪤[R] L2 & R L1 V1 V2 & I1 = I2.
+lemma lex_inv_pair (R): ∀I1,I2,L1,L2,V1,V2.
+                        L1.ⓑ{I1}V1 ⪤[R] L2.ⓑ{I2}V2 →
+                        ∧∧ L1 ⪤[R] L2 & R L1 V1 V2 & I1 = I2.
 #R #I1 #I2 #L1 #L2 #V1 #V2 #H elim (lex_inv_pair_sn … H) -H
 #L0 #V0 #HL10 #HV10 #H destruct /2 width=1 by and3_intro/
 qed-.
+
+(* Basic eliminators ********************************************************)
+
+lemma lex_ind (R) (Q:relation2 …):
+              Q (⋆) (⋆) →
+              (
+                 ∀I,K1,K2. K1 ⪤[R] K2 → Q K1 K2 → Q (K1.ⓤ{I}) (K2.ⓤ{I})
+              ) → (
+                 ∀I,K1,K2,V1,V2. K1 ⪤[R] K2 → Q K1 K2 → R K1 V1 V2 →Q (K1.ⓑ{I}V1) (K2.ⓑ{I}V2)
+              ) →
+              ∀L1,L2. L1 ⪤[R] L2 → Q L1 L2.
+#R #Q #IH1 #IH2 #IH3 #L1 #L2 * #f @pull_2 #H
+elim H -f -L1 -L2 // #f #I1 #I2 #K1 #K2 @pull_4 #H
+[ elim (isid_inv_next … H)
+| lapply (isid_inv_push … H ??)
+] -H [5:|*: // ] #Hf @pull_2 #H
+elim H -H /3 width=3 by ex2_intro/
+qed-.