partial commit: just the components before "static" ...

[helm.git] / matita / matita / lib / basics / star.ma

diff --git a/matita/matita/lib/basics/star.ma b/matita/matita/lib/basics/star.ma
index f935f007058e32bf9f852fbcd03d7136658a5393..6592592aa6f092861531fa9e95e97fa841559e06 100644 (file)
--- a/matita/matita/lib/basics/star.ma
+++ b/matita/matita/lib/basics/star.ma
@@ -193,7 +193,7 @@ lemma WF_antimonotonic: ∀A,R,S. subR A R S →
 #H #Hind % #c #Rcb @Hind @subRS //
 qed.
 
-(* added from lambda_delta *)
+(* added from λδ *)
 
 lemma TC_strap: ∀A. ∀R:relation A. ∀a1,a,a2.
                 R a1 a → TC … R a a2 → TC … R a1 a2.
@@ -265,7 +265,27 @@ lemma TC_Conf3: ∀A,B,S,R. Conf3 A B S R → Conf3 A B S (TC … R).
 #A #B #S #R #HSR #b #a1 #Ha1 #a2 #H elim H -a2 /2 width=3/
 qed.
 
-inductive bi_TC (A,B:Type[0]) (R:bi_relation A B) (a:A) (b:B): relation2 A B ≝
+(* ************ confluence of star *****************)
+
+lemma star_strip: ∀A,R. confluent A R →
+                  ∀a0,a1. star … R a0 a1 → ∀a2. R a0 a2 →
+                  ∃∃a. R a1 a & star … R a2 a.
+#A #R #HR #a0 #a1 #H elim H -a1 /2 width=3/
+#a #a1 #_ #Ha1 #IHa0 #a2 #Ha02
+elim (IHa0 … Ha02) -a0 #a0 #Ha0 #Ha20
+elim (HR … Ha1 … Ha0) -a /3 width=5/
+qed-.
+
+lemma star_confluent: ∀A,R. confluent A R → confluent A (star … R).
+#A #R #HR #a0 #a1 #H elim H -a1 /2 width=3/
+#a #a1 #_ #Ha1 #IHa0 #a2 #Ha02
+elim (IHa0 … Ha02) -a0 #a0 #Ha0 #Ha20
+elim (star_strip … HR … Ha0 … Ha1) -a /3 width=5/
+qed-.
+
+(* relations on unboxed pairs ***********************************************)
+
+inductive bi_TC (A,B) (R:bi_relation A B) (a:A) (b:B): relation2 A B ≝
   |bi_inj : ∀c,d. R a b c d → bi_TC A B R a b c d
   |bi_step: ∀c,d,e,f. bi_TC A B R a b c d → R c d e f → bi_TC A B R a b e f.
 
@@ -273,12 +293,12 @@ lemma bi_TC_strap: ∀A,B. ∀R:bi_relation A B. ∀a1,a,a2,b1,b,b2.
                    R a1 b1 a b → bi_TC … R a b a2 b2 → bi_TC … R a1 b1 a2 b2.
 #A #B #R #a1 #a #a2 #b1 #b #b2 #HR #H elim H -a2 -b2 /2 width=4/ /3 width=4/
 qed.
-                       
+
 lemma bi_TC_reflexive: ∀A,B,R. bi_reflexive A B R →
-                       bi_reflexive A B (bi_TC … R).
+                       bi_reflexive … (bi_TC … R).
 /2 width=1/ qed.
 
-inductive bi_TC_dx (A,B:Type[0]) (R:bi_relation A B): bi_relation A B ≝
+inductive bi_TC_dx (A,B) (R:bi_relation A B): bi_relation A B ≝
   |bi_inj_dx  : ∀a1,a2,b1,b2. R a1 b1 a2 b2 → bi_TC_dx A B R a1 b1 a2 b2
   |bi_step_dx : ∀a1,a,a2,b1,b,b2. R a1 b1 a b → bi_TC_dx A B R a b a2 b2 →
                 bi_TC_dx A B R a1 b1 a2 b2.
@@ -298,7 +318,7 @@ qed.
 lemma bi_TC_dx_to_bi_TC: ∀A,B. ∀R: bi_relation A B.
                          ∀a1,a2,b1,b2. bi_TC_dx … R a1 b1 a2 b2 →
                          bi_TC … R a1 b1 a2 b2.
-#A #b #R #a1 #a2 #b1 #b2 #H12 elim H12 -a1 -a2 -b1 -b2 /2 width=4/
+#A #B #R #a1 #a2 #b1 #b2 #H12 elim H12 -a1 -a2 -b1 -b2 /2 width=4/
 qed.
 
 fact bi_TC_ind_dx_aux: ∀A,B,R,a2,b2. ∀P:relation2 A B.
@@ -306,7 +326,7 @@ fact bi_TC_ind_dx_aux: ∀A,B,R,a2,b2. ∀P:relation2 A B.
                        (∀a1,a,b1,b. R a1 b1 a b → bi_TC … R a b a2 b2 → P a b → P a1 b1) →
                        ∀a1,a,b1,b. bi_TC … R a1 b1 a b → a = a2 → b = b2 → P a1 b1.
 #A #B #R #a2 #b2 #P #H1 #H2 #a1 #a #b1 #b #H1
-elim (bi_TC_to_bi_TC_dx ??????? H1) -a1 -a -b1 -b
+elim (bi_TC_to_bi_TC_dx … a1 a b1 b H1) -a1 -a -b1 -b
 [ #a1 #x #b1 #y #H1 #Hx #Hy destruct /2 width=1/
 | #a1 #a #x #b1 #b #y #H1 #H #IH #Hx #Hy destruct /3 width=5/
 ]
@@ -323,14 +343,15 @@ qed-.
 lemma bi_TC_symmetric: ∀A,B,R. bi_symmetric A B R →
                        bi_symmetric A B (bi_TC … R).
 #A #B #R #HR #a1 #a2 #b1 #b2 #H21
-@(bi_TC_ind_dx ?????????? H21) -a2 -b2 /3 width=1/ /3 width=4/
+@(bi_TC_ind_dx … a2 b2 H21) -a2 -b2 /3 width=1/ /3 width=4/
 qed.
 
 lemma bi_TC_transitive: ∀A,B,R. bi_transitive A B (bi_TC … R).
 #A #B #R #a1 #a #b1 #b #H elim H -a -b /2 width=4/ /3 width=4/
 qed.
 
-definition bi_Conf3: ∀A,B,C. relation3 A B C → bi_relation A B → Prop ≝ λA,B,C,S,R.
+definition bi_Conf3: ∀A,B,C. relation3 A B C → predicate (bi_relation A B) ≝
+                     λA,B,C,S,R.
                      ∀c,a1,b1. S a1 b1 c → ∀a2,b2. R a1 b1 a2 b2 → S a2 b2 c.
 
 lemma bi_TC_Conf3: ∀A,B,C,S,R. bi_Conf3 A B C S R → bi_Conf3 A B C S (bi_TC … R).
@@ -348,14 +369,14 @@ lemma bi_TC_star_ind_dx: ∀A,B,R. bi_reflexive A B R →
                          (∀a1,a,b1,b. R a1 b1 a b → bi_TC … R a b a2 b2 → P a b → P a1 b1) →
                          ∀a1,b1. bi_TC … R a1 b1 a2 b2 → P a1 b1.
 #A #B #R #HR #a2 #b2 #P #H2 #IH #a1 #b1 #H12
-@(bi_TC_ind_dx … P ? IH … H12) /3 width=5/
+@(bi_TC_ind_dx … IH … a1 b1 H12) /3 width=5/
 qed-.
 
-definition bi_star: ∀A,B,R. bi_relation A B ≝ λA,B,R,a1,b1,a2,b2.
-                    (a1 = a2 ∧ b1 = b2) ∨ bi_TC A B R a1 b1 a2 b2.
+definition bi_star: ∀A,B,R. bi_relation A B ≝
+                    λA,B,R. bi_RC A B (bi_TC … R).
 
 lemma bi_star_bi_reflexive: ∀A,B,R. bi_reflexive A B (bi_star … R).
-/3 width=1/ qed.
+/2 width=1/ qed.
 
 lemma bi_TC_to_bi_star: ∀A,B,R,a1,b1,a2,b2.
                         bi_TC A B R a1 b1 a2 b2 → bi_star A B R a1 b1 a2 b2.
@@ -368,39 +389,39 @@ lemma bi_R_to_bi_star: ∀A,B,R,a1,b1,a2,b2.
 lemma bi_star_strap1: ∀A,B,R,a1,a,a2,b1,b,b2. bi_star A B R a1 b1 a b →
                       R a b a2 b2 → bi_star A B R a1 b1 a2 b2.
 #A #B #R #a1 #a #a2 #b1 #b #b2 *
-[ * #H1 #H2 destruct /2 width=1/
-| /3 width=4/
+[ /3 width=4/
+| * #H1 #H2 destruct /2 width=1/
 ]
 qed.
 
 lemma bi_star_strap2: ∀A,B,R,a1,a,a2,b1,b,b2. R a1 b1 a b →
                       bi_star A B R a b a2 b2 → bi_star A B R a1 b1 a2 b2.
 #A #B #R #a1 #a #a2 #b1 #b #b2 #H *
-[ * #H1 #H2 destruct /2 width=1/
-| /3 width=4/
+[ /3 width=4/
+| * #H1 #H2 destruct /2 width=1/
 ]
 qed.
 
 lemma bi_star_to_bi_TC_to_bi_TC: ∀A,B,R,a1,a,a2,b1,b,b2. bi_star A B R a1 b1 a b →
                                  bi_TC A B R a b a2 b2 → bi_TC A B R a1 b1 a2 b2.
 #A #B #R #a1 #a #a2 #b1 #b #b2 *
-[ * #H1 #H2 destruct /2 width=1/
-| /2 width=4/
+[ /2 width=4/
+| * #H1 #H2 destruct /2 width=1/
 ]
 qed.
 
 lemma bi_TC_to_bi_star_to_bi_TC: ∀A,B,R,a1,a,a2,b1,b,b2. bi_TC A B R a1 b1 a b →
                                  bi_star A B R a b a2 b2 → bi_TC A B R a1 b1 a2 b2.
 #A #B #R #a1 #a #a2 #b1 #b #b2 #H *
-[ * #H1 #H2 destruct /2 width=1/
-| /2 width=4/
+[ /2 width=4/
+| * #H1 #H2 destruct /2 width=1/
 ]
 qed.
 
 lemma bi_tansitive_bi_star: ∀A,B,R. bi_transitive A B (bi_star … R).
 #A #B #R #a1 #a #b1 #b #H #a2 #b2 *
-[ * #H1 #H2 destruct /2 width=1/
-| /3 width=4/
+[ /3 width=4/
+| * #H1 #H2 destruct /2 width=1/
 ]
 qed.
 
@@ -408,8 +429,8 @@ lemma bi_star_ind: ∀A,B,R,a1,b1. ∀P:relation2 A B. P a1 b1 →
                    (∀a,a2,b,b2. bi_star … R a1 b1 a b → R a b a2 b2 → P a b → P a2 b2) →
                    ∀a2,b2. bi_star … R a1 b1 a2 b2 → P a2 b2.
 #A #B #R #a1 #b1 #P #H #IH #a2 #b2 *
-[ * #H1 #H2 destruct //
-| #H12 elim H12 -a2 -b2 /2 width=5/ -H /3 width=5/
+[ #H12 elim H12 -a2 -b2 /2 width=5/ -H /3 width=5/
+| * #H1 #H2 destruct //
 ]
 qed-.
 
@@ -417,25 +438,106 @@ lemma bi_star_ind_dx: ∀A,B,R,a2,b2. ∀P:relation2 A B. P a2 b2 →
                       (∀a1,a,b1,b. R a1 b1 a b → bi_star … R a b a2 b2 → P a b → P a1 b1) →
                       ∀a1,b1. bi_star … R a1 b1 a2 b2 → P a1 b1.
 #A #B #R #a2 #b2 #P #H #IH #a1 #b1 *
-[ * #H1 #H2 destruct //
-| #H12 @(bi_TC_ind_dx ?????????? H12) -a1 -b1 /2 width=5/ -H /3 width=5/
+[ #H12 @(bi_TC_ind_dx … a1 b1 H12) -a1 -b1 /2 width=5/ -H /3 width=5/
+| * #H1 #H2 destruct //
 ]
 qed-.
 
-(* ************ confluence of star *****************)
+(* relations on unboxed triples *********************************************)
 
-lemma star_strip: ∀A,R. confluent A R →
-                  ∀a0,a1. star … R a0 a1 → ∀a2. R a0 a2 →
-                  ∃∃a. R a1 a & star … R a2 a.
-#A #R #HR #a0 #a1 #H elim H -a1 /2 width=3/
-#a #a1 #_ #Ha1 #IHa0 #a2 #Ha02
-elim (IHa0 … Ha02) -a0 #a0 #Ha0 #Ha20
-elim (HR … Ha1 … Ha0) -a /3 width=5/
+inductive tri_TC (A,B,C) (R:tri_relation A B C) (a1:A) (b1:B) (c1:C): relation3 A B C ≝
+  |tri_inj : ∀a2,b2,c2. R a1 b1 c1 a2 b2 c2 → tri_TC A B C R a1 b1 c1 a2 b2 c2 
+  |tri_step: ∀a,a2,b,b2,c,c2. 
+             tri_TC A B C R a1 b1 c1 a b c → R a b c a2 b2 c2 →
+             tri_TC A B C R a1 b1 c1 a2 b2 c2.
+
+lemma tri_TC_strap: ∀A,B,C. ∀R:tri_relation A B C. ∀a1,a,a2,b1,b,b2,c1,c,c2.
+                    R a1 b1 c1 a b c → tri_TC … R a b c a2 b2 c2 →
+                    tri_TC … R a1 b1 c1 a2 b2 c2.
+#A #B #C #R #a1 #a #a2 #b1 #b #b2 #c1 #c #c2 #HR #H elim H -a2 -b2 -c2 /2 width=5/ /3 width=5/
+qed.
+
+lemma tri_TC_reflexive: ∀A,B,C,R. tri_reflexive A B C R →
+                        tri_reflexive … (tri_TC … R).
+/2 width=1/ qed.
+
+inductive tri_TC_dx (A,B,C) (R:tri_relation A B C): tri_relation A B C ≝
+  |tri_inj_dx  : ∀a1,a2,b1,b2,c1,c2. R a1 b1 c1 a2 b2 c2 → tri_TC_dx A B C R a1 b1 c1 a2 b2 c2
+  |tri_step_dx : ∀a1,a,a2,b1,b,b2,c1,c,c2.
+                 R a1 b1 c1 a b c → tri_TC_dx A B C R a b c a2 b2 c2 →
+                 tri_TC_dx A B C R a1 b1 c1 a2 b2 c2.
+
+lemma tri_TC_dx_strap: ∀A,B,C. ∀R: tri_relation A B C.
+                       ∀a1,a,a2,b1,b,b2,c1,c,c2.
+                       tri_TC_dx A B C R a1 b1 c1 a b c →
+                       R a b c a2 b2 c2 → tri_TC_dx A B C R a1 b1 c1 a2 b2 c2.
+#A #B #C #R #a1 #a #a2 #b1 #b #b2 #c1 #c #c2 #H1 elim H1 -a -b -c /3 width=5/
+qed.
+
+lemma tri_TC_to_tri_TC_dx: ∀A,B,C. ∀R: tri_relation A B C.
+                           ∀a1,a2,b1,b2,c1,c2. tri_TC … R a1 b1 c1 a2 b2 c2 →
+                           tri_TC_dx … R a1 b1 c1 a2 b2 c2.
+#A #B #C #R #a1 #a2 #b1 #b2 #c1 #c2 #H12 elim H12 -a2 -b2 -c2 /2 width=1/ /2 width=5/
+qed.
+
+lemma tri_TC_dx_to_tri_TC: ∀A,B,C. ∀R: tri_relation A B C.
+                           ∀a1,a2,b1,b2,c1,c2. tri_TC_dx … R a1 b1 c1 a2 b2 c2 →
+                           tri_TC … R a1 b1 c1 a2 b2 c2.
+#A #B #C #R #a1 #a2 #b1 #b2 #c1 #c2 #H12 elim H12 -a1 -a2 -b1 -b2 -c1 -c2
+/2 width=1/ /2 width=5/
+qed.
+
+fact tri_TC_ind_dx_aux: ∀A,B,C,R,a2,b2,c2. ∀P:relation3 A B C.
+                        (∀a1,b1,c1. R a1 b1 c1 a2 b2 c2→ P a1 b1 c1) →
+                        (∀a1,a,b1,b,c1,c. R a1 b1 c1 a b c → tri_TC … R a b c a2 b2 c2 → P a b c → P a1 b1 c1) →
+                        ∀a1,a,b1,b,c1,c. tri_TC … R a1 b1 c1 a b c → a = a2 → b = b2 → c = c2 → P a1 b1 c1.
+#A #B #C #R #a2 #b2 #c2 #P #H1 #H2 #a1 #a #b1 #b #c1 #c #H1
+elim (tri_TC_to_tri_TC_dx … a1 a b1 b c1 c H1) -a1 -a -b1 -b -c1 -c
+[ #a1 #x #b1 #y #c1 #z #H1 #Hx #Hy #Hz destruct /2 width=1/
+| #a1 #a #x #b1 #b #y #c1 #c #z #H1 #H #IH #Hx #Hy #Hz destruct /3 width=6/
+]
 qed-.
 
-lemma star_confluent: ∀A,R. confluent A R → confluent A (star … R).
-#A #R #HR #a0 #a1 #H elim H -a1 /2 width=3/
-#a #a1 #_ #Ha1 #IHa0 #a2 #Ha02
-elim (IHa0 … Ha02) -a0 #a0 #Ha0 #Ha20
-elim (star_strip … HR … Ha0 … Ha1) -a /3 width=5/
+lemma tri_TC_ind_dx: ∀A,B,C,R,a2,b2,c2. ∀P:relation3 A B C.
+                     (∀a1,b1,c1. R a1 b1 c1 a2 b2 c2 → P a1 b1 c1) →
+                     (∀a1,a,b1,b,c1,c. R a1 b1 c1 a b c → tri_TC … R a b c a2 b2 c2 → P a b c → P a1 b1 c1) →
+                     ∀a1,b1,c1. tri_TC … R a1 b1 c1 a2 b2 c2 → P a1 b1 c1.
+#A #B #C #R #a2 #b2 #c2 #P #H1 #H2 #a1 #b1 #c1 #H12
+@(tri_TC_ind_dx_aux ???????? H1 H2 … H12) //
+qed-.
+
+lemma tri_TC_symmetric: ∀A,B,C,R. tri_symmetric A B C R →
+                        tri_symmetric … (tri_TC … R).
+#A #B #C #R #HR #a1 #a2 #b1 #b2 #c1 #c2 #H21
+@(tri_TC_ind_dx … a2 b2 c2 H21) -a2 -b2 -c2 /3 width=1/ /3 width=5/
+qed.
+
+lemma tri_TC_transitive: ∀A,B,C,R. tri_transitive A B C (tri_TC … R).
+#A #B #C #R #a1 #a #b1 #b #c1 #c #H elim H -a -b -c /2 width=5/ /3 width=5/
+qed.
+
+definition tri_Conf4: ∀A,B,C,D. relation4 A B C D → predicate (tri_relation A B C) ≝
+                      λA,B,C,D,S,R.
+                      ∀d,a1,b1,c1. S a1 b1 c1 d → ∀a2,b2,c2. R a1 b1 c1 a2 b2 c2 → S a2 b2 c2 d.
+
+lemma tri_TC_Conf4: ∀A,B,C,D,S,R.
+                    tri_Conf4 A B C D S R → tri_Conf4 A B C D S (tri_TC … R).
+#A #B #C #D #S #R #HSR #d #a1 #b1 #c1 #Habc1 #a2 #b2 #c2 #H elim H -a2 -b2 -c2
+/2 width=5/
+qed.
+
+lemma tri_TC_star_ind: ∀A,B,C,R. tri_reflexive A B C R →
+                       ∀a1,b1,c1. ∀P:relation3 A B C.
+                       P a1 b1 c1 → (∀a,a2,b,b2,c,c2. tri_TC … R a1 b1 c1 a b c → R a b c a2 b2 c2 → P a b c → P a2 b2 c2) →
+                       ∀a2,b2,c2. tri_TC … R a1 b1 c1 a2 b2 c2 → P a2 b2 c2.
+#A #B #C #R #HR #a1 #b1 #c1 #P #H1 #IH #a2 #b2 #c2 #H12 elim H12 -a2 -b2 -c2
+/2 width=6/ /3 width=6/
+qed-.
+
+lemma tri_TC_star_ind_dx: ∀A,B,C,R. tri_reflexive A B C R →
+                          ∀a2,b2,c2. ∀P:relation3 A B C. P a2 b2 c2 →
+                          (∀a1,a,b1,b,c1,c. R a1 b1 c1 a b c → tri_TC … R a b c a2 b2 c2 → P a b c → P a1 b1 c1) →
+                          ∀a1,b1,c1. tri_TC … R a1 b1 c1 a2 b2 c2 → P a1 b1 c1.
+#A #B #C #R #HR #a2 #b2 #c2 #P #H2 #IH #a1 #b1 #c1 #H12
+@(tri_TC_ind_dx  … IH … a1 b1 c1 H12) /3 width=6/
 qed-.