X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fnlibrary%2Fsets%2Fsets.ma;h=0e2dd418d3c19ef4e00d02e02c8ed15c79175734;hb=bac3136bf99a18374b91e1ec900e455567e8f741;hp=b644c4f42bf4443e616510164d7741dd90b054c1;hpb=a5a3d944e528c6006f0ea901dded7c79367adb75;p=helm.git

diff --git a/helm/software/matita/nlibrary/sets/sets.ma b/helm/software/matita/nlibrary/sets/sets.ma
index b644c4f42..0e2dd418d 100644
--- a/helm/software/matita/nlibrary/sets/sets.ma
+++ b/helm/software/matita/nlibrary/sets/sets.ma
@@ -77,27 +77,27 @@ unification hint 0 ≔ A ⊢ carr1 (mk_setoid1 (Ω^A) (eq1 (powerclass_setoid A)
 
 include "logic/cprop.ma".
 
-nrecord qpowerclass (A: setoid) : Type[1] ≝
- { pc:> Ω^A; (* qui pc viene dichiarato con un target preciso... 
+nrecord ext_powerclass (A: setoid) : Type[1] ≝
+ { ext_carr:> Ω^A; (* qui pc viene dichiarato con un target preciso... 
                 forse lo si vorrebbe dichiarato con un target più lasco 
                 ma la sintassi :> non lo supporta *)
-   mem_ok': ∀x,x':A. x=x' → (x ∈ pc) = (x' ∈ pc) 
+   ext_prop: ∀x,x':A. x=x' → (x ∈ ext_carr) = (x' ∈ ext_carr) 
  }.
  
 notation > "𝛀 ^ term 90 A" non associative with precedence 70 
-for @{ 'qpowerclass $A }.
+for @{ 'ext_powerclass $A }.
 
 notation "Ω term 90 A \atop ≈" non associative with precedence 70 
-for @{ 'qpowerclass $A }.
+for @{ 'ext_powerclass $A }.
 
-interpretation "qpowerclass" 'qpowerclass a = (qpowerclass a).
+interpretation "extensional powerclass" 'ext_powerclass a = (ext_powerclass a).
 
 ndefinition Full_set: ∀A. 𝛀^A.
  #A; @[ napply A | #x; #x'; #H; napply refl1]
 nqed.
-ncoercion Full_set: ∀A. qpowerclass A ≝ Full_set on A: setoid to qpowerclass ?.
+ncoercion Full_set: ∀A. ext_powerclass A ≝ Full_set on A: setoid to ext_powerclass ?.
 
-ndefinition qseteq: ∀A. equivalence_relation1 (𝛀^A).
+ndefinition ext_seteq: ∀A. equivalence_relation1 (𝛀^A).
  #A; @
   [ napply (λS,S'. S = S')
   | #S; napply (refl1 ? (seteq A))
@@ -105,40 +105,46 @@ ndefinition qseteq: ∀A. equivalence_relation1 (𝛀^A).
   | #S; #T; #U; napply (trans1 ? (seteq A))]
 nqed.
 
-ndefinition qpowerclass_setoid: setoid → setoid1.
+ndefinition ext_powerclass_setoid: setoid → setoid1.
  #A; @
-  [ napply (qpowerclass A)
-  | napply (qseteq A) ]
+  [ napply (ext_powerclass A)
+  | napply (ext_seteq A) ]
 nqed.
               
-unification hint 0 ≔ A ⊢  
-  carr1 (mk_setoid1 (𝛀^A) (eq1 (qpowerclass_setoid A))) 
-≡ qpowerclass A.
+unification hint 0 ≔ A;
+      R ≟ (mk_setoid1 (𝛀^A) (eq1 (ext_powerclass_setoid A)))
+  (* ----------------------------------------------------- *) ⊢  
+                 carr1 R ≡ ext_powerclass A.
 
-ncoercion pc' : ∀A.∀x:qpowerclass_setoid A. Ω^A ≝ pc 
-on _x : (carr1 (qpowerclass_setoid ?)) to (Ω^?). 
+interpretation "prop21 mem" 'prop2 l r = (prop21 (setoid1_of_setoid ?) (ext_powerclass_setoid ?) ? ? ???? l r).
+      
+(*
+ncoercion ext_carr' : ∀A.∀x:ext_powerclass_setoid A. Ω^A ≝ ext_carr 
+on _x : (carr1 (ext_powerclass_setoid ?)) to (Ω^?). 
+*)
 
-nlemma mem_ok: ∀A. binary_morphism1 (setoid1_of_setoid A) (qpowerclass_setoid A) CPROP.
+nlemma mem_ext_powerclass_setoid_is_morph: 
+ ∀A. binary_morphism1 (setoid1_of_setoid A) (ext_powerclass_setoid A) CPROP.
  #A; @
   [ napply (λx,S. x ∈ S) 
   | #a; #a'; #b; #b'; #Ha; *; #Hb1; #Hb2; @; #H;
-     ##[ napply Hb1; napply (. (mem_ok' …)); ##[##3: napply H| napply Ha^-1;##]
-     ##| napply Hb2; napply (. (mem_ok' …)); ##[##3: napply H| napply Ha;##]
+     ##[ napply Hb1; napply (. (ext_prop … Ha^-1)); nassumption;
+     ##| napply Hb2; napply (. (ext_prop … Ha)); nassumption;
      ##]
   ##]
 nqed.
 
 unification hint 0 ≔  A:setoid, x, S;  
-         SS ≟ (pc ? S),
-         TT ≟ (mk_binary_morphism1 ??? 
-                 (λx:setoid1_of_setoid ?.λS:qpowerclass_setoid ?. x ∈ S) 
-                 (prop21 ??? (mem_ok A)))
-           
+     SS ≟ (ext_carr ? S),
+     TT ≟ (mk_binary_morphism1 ??? 
+             (λx:setoid1_of_setoid ?.λS:ext_powerclass_setoid ?. x ∈ S) 
+             (prop21 ??? (mem_ext_powerclass_setoid_is_morph A))),
+     XX ≟ (ext_powerclass_setoid A)
   (*-------------------------------------*) ⊢ 
-    fun21 ? ? ? TT x S 
-  ≡ mem A SS x.
+      fun21 (setoid1_of_setoid A) XX CPROP TT x S 
+    ≡ mem A SS x.
 
-nlemma subseteq_ok: ∀A. binary_morphism1 (qpowerclass_setoid A) (qpowerclass_setoid A) CPROP.
+nlemma subseteq_is_morph: ∀A. binary_morphism1 (ext_powerclass_setoid A) (ext_powerclass_setoid A) CPROP.
  #A; @
   [ napply (λS,S'. S ⊆ S')
   | #a; #a'; #b; #b'; *; #Ha1; #Ha2; *; #Hb1; #Hb2; @; #H
@@ -152,20 +158,23 @@ unification hint 0 ≔ A,a,a'
  (*-----------------------------------------------------------------*) ⊢
   eq_rel ? (eq A) a a' ≡ eq_rel1 ? (eq1 (setoid1_of_setoid A)) a a'.
 
-nlemma intersect_ok: ∀A. 𝛀^A → 𝛀^A → 𝛀^A.
+nlemma intersect_is_ext: ∀A. 𝛀^A → 𝛀^A → 𝛀^A.
  #A; #S; #S'; @ (S ∩ S');
- #a; #a'; #Ha; @; *; #H1; #H2; @
+ #a; #a'; #Ha; @; *; #H1; #H2; @ 
   [##1,2: napply (. Ha^-1‡#); nassumption;
 ##|##3,4: napply (. Ha‡#); nassumption]
 nqed.
 
 alias symbol "hint_decl" = "hint_decl_Type1".
-unification hint 1 ≔ 
-  A : setoid, B,C : qpowerclass A ⊢ 
-    pc A (mk_qpowerclass ? (B ∩ C) (mem_ok' ? (intersect_ok ? B C))) 
-    ≡ intersect ? (pc ? B) (pc ? C).
-
-nlemma intersect_ok': ∀A. binary_morphism1 (powerclass_setoid A) (powerclass_setoid A) (powerclass_setoid A).
+unification hint 0 ≔ 
+  A : setoid, B,C : ext_powerclass A;
+  R ≟ (mk_ext_powerclass ? (B ∩ C) (ext_prop ? (intersect_is_ext ? B C)))
+  
+  (* ------------------------------------------*)  ⊢ 
+    ext_carr A R ≡ intersect ? (ext_carr ? B) (ext_carr ? C).
+
+nlemma intersect_is_morph: 
+ ∀A. binary_morphism1 (powerclass_setoid A) (powerclass_setoid A) (powerclass_setoid A).
  #A; @ (λS,S'. S ∩ S');
  #a; #a'; #b; #b'; *; #Ha1; #Ha2; *; #Hb1; #Hb2; @; #x; nnormalize; *; #Ka; #Kb; @
   [ napply Ha1; nassumption
@@ -176,51 +185,64 @@ nqed.
 
 alias symbol "hint_decl" = "hint_decl_Type1".
 unification hint 0 ≔ 
-  A : Type[0], B,C : powerclass A ⊢ 
-    fun21 …
-     (mk_binary_morphism1 …
+  A : Type[0], B,C : Ω^A;
+  R ≟ (mk_binary_morphism1 …
        (λS,S'.S ∩ S') 
-       (prop21 … (intersect_ok' A))) B C
-    ≡ intersect ? B C.
-
-ndefinition prop21_mem : 
-  ∀A,C.∀f:binary_morphism1 (setoid1_of_setoid A) (qpowerclass_setoid A) C.
-   ∀a,a':setoid1_of_setoid A.
-    ∀b,b':qpowerclass_setoid A.a = a' → b = b' → f a b = f a' b'.
-#A; #C; #f; #a; #a'; #b; #b'; #H1; #H2; napply prop21; nassumption;
-nqed.
-    
-interpretation "prop21 mem" 'prop2 l r = (prop21_mem ??????? l r).
+       (prop21 … (intersect_is_morph A)))
+   ⊢ 
+    fun21 (powerclass_setoid A) (powerclass_setoid A) (powerclass_setoid A) R B C 
+  ≡ intersect ? B C.
+
+interpretation "prop21 ext" 'prop2 l r = (prop21 (ext_powerclass_setoid ?) (ext_powerclass_setoid ?) ? ? ???? l r).
 
-nlemma intersect_ok'': 
-  ∀A. binary_morphism1 (qpowerclass_setoid A) (qpowerclass_setoid A) (qpowerclass_setoid A).
- #A; @ (intersect_ok A); nlapply (prop21 … (intersect_ok' A)); #H;
- #a; #a'; #b; #b'; #H1; #H2; napply H; nassumption; 
+nlemma intersect_is_ext_morph: 
+ ∀A. binary_morphism1 (ext_powerclass_setoid A) (ext_powerclass_setoid A) (ext_powerclass_setoid A).
+ #A; @ (intersect_is_ext …); nlapply (prop21 … (intersect_is_morph A));
+#H; #a; #a'; #b; #b'; #H1; #H2; napply H; nassumption; 
 nqed.
 
 unification hint 1 ≔ 
-  A:?, B,C : 𝛀^A ⊢ 
-    fun21 …
-     (mk_binary_morphism1 …
-       (λS,S':qpowerclass_setoid A.S ∩ S') 
-       (prop21 … (intersect_ok'' A))) B C
-    ≡ intersect ? B C.
+      A:setoid, B,C : 𝛀^A;
+      R ≟ (mk_binary_morphism1 (ext_powerclass_setoid A) (ext_powerclass_setoid A) (ext_powerclass_setoid A)
+              (λS,S':carr1 (ext_powerclass_setoid A).
+                mk_ext_powerclass A (S∩S') (ext_prop A (intersect_is_ext ? S S'))) 
+              (prop21 … (intersect_is_ext_morph A))) ,
+       BB ≟ (ext_carr ? B),
+       CC ≟ (ext_carr ? C)
+   (* ------------------------------------------------------*) ⊢ 
+            ext_carr A
+             (fun21 
+              (ext_powerclass_setoid A) 
+              (ext_powerclass_setoid A) 
+              (ext_powerclass_setoid A) R B C) ≡ 
+            intersect (carr A) BB CC.
 
-
-    
+(*
+alias symbol "hint_decl" = "hint_decl_Type2".
+unification hint 0 ≔
+  A : setoid, B,C : 𝛀^A ;
+  CC ≟ (ext_carr ? C),
+  BB ≟ (ext_carr ? B),
+  C1 ≟ (carr1 (powerclass_setoid (carr A))),
+  C2 ≟ (carr1 (ext_powerclass_setoid A))
+  ⊢ 
+     eq_rel1 C1 (eq1 (powerclass_setoid (carr A))) BB CC ≡ 
+          eq_rel1 C2 (eq1 (ext_powerclass_setoid A)) B C.
+          
+unification hint 0 ≔
+  A, B : CPROP ⊢ iff A B ≡ eq_rel1 ? (eq1 CPROP) A B.    
     
-nlemma test: ∀U.∀A,B:qpowerclass U. A ∩ B = A →
+nlemma test: ∀U.∀A,B:𝛀^U. A ∩ B = A →
  ∀x,y. x=y → x ∈ A → y ∈ A ∩ B.
  #U; #A; #B; #H; #x; #y; #K; #K2;
- alias symbol "prop2" = "prop21".
-alias symbol "invert" = "setoid1 symmetry".
-napply (. (K^-1 ‡ (prop21 ??? (intersect_ok'' U) ???? H^-1 #))); STOP
- 
- napply (. K^-1‡(H^-1‡#)); nassumption;
+  alias symbol "prop2" = "prop21 mem".
+  alias symbol "invert" = "setoid1 symmetry".
+  napply (. K^-1‡H);
+  nassumption;
 nqed. 
 
-(*
-nlemma intersect_ok: ∀A. binary_morphism1 (qpowerclass_setoid A) (qpowerclass_setoid A) (qpowerclass_setoid A).
+
+nlemma intersect_ok: ∀A. binary_morphism1 (ext_powerclass_setoid A) (ext_powerclass_setoid A) (ext_powerclass_setoid A).
  #A; @
   [ #S; #S'; @
      [ napply (S ∩ S')
@@ -230,14 +252,16 @@ nlemma intersect_ok: ∀A. binary_morphism1 (qpowerclass_setoid A) (qpowerclass_
       ##|##3,4: napply (. Ha‡#); nassumption]##]
  ##| #a; #a'; #b; #b'; #Ha; #Hb; nwhd; @; #x; nwhd in ⊢ (% → %); #H
       [ alias symbol "invert" = "setoid1 symmetry".
-        napply (. ((#‡Ha^-1)‡(#‡Hb^-1))); nassumption
+        alias symbol "refl" = "refl".
+alias symbol "prop2" = "prop21".
+napply (. ((#‡Ha^-1)‡(#‡Hb^-1))); nassumption
       | napply (. ((#‡Ha)‡(#‡Hb))); nassumption ]##]
 nqed.
 
 (* unfold if intersect, exposing fun21 *)
 alias symbol "hint_decl" = "hint_decl_Type1".
 unification hint 0 ≔ 
-  A : setoid, B,C : qpowerclass A ⊢ 
+  A : setoid, B,C : ext_powerclass A ⊢ 
     pc A (fun21 …
             (mk_binary_morphism1 …
               (λS,S':qpowerclass_setoid A.mk_qpowerclass ? (S ∩ S') (mem_ok' ? (intersect_ok ? S S'))) 
@@ -300,11 +324,11 @@ nlemma first_omomorphism_theorem_functions1:
 nqed.
 
 ndefinition surjective ≝
- λA,B.λS: qpowerclass A.λT: qpowerclass B.λf:unary_morphism A B.
+ λA,B.λS: ext_powerclass A.λT: ext_powerclass B.λf:unary_morphism A B.
   ∀y. y ∈ T → ∃x. x ∈ S ∧ f x = y.
 
 ndefinition injective ≝
- λA,B.λS: qpowerclass A.λf:unary_morphism A B.
+ λA,B.λS: ext_powerclass A.λf:unary_morphism A B.
   ∀x,x'. x ∈ S → x' ∈ S → f x = f x' → x = x'.
 
 nlemma first_omomorphism_theorem_functions2:
@@ -320,13 +344,25 @@ nlemma first_omomorphism_theorem_functions3:
  #A; #B; #f; nwhd; #x; #x'; #Hx; #Hx'; #K; nassumption.
 nqed.
 
-nrecord isomorphism (A, B : setoid) (S: qpowerclass A) (T: qpowerclass B) : Type[0] ≝
+nrecord isomorphism (A, B : setoid) (S: ext_powerclass A) (T: ext_powerclass B) : Type[0] ≝
  { iso_f:> unary_morphism A B;
    f_closed: ∀x. x ∈ S → iso_f x ∈ T;
    f_sur: surjective … S T iso_f;
    f_inj: injective … S iso_f
  }.
 
+nlemma subseteq_intersection_l: ∀A.∀U,V,W:Ω^A.U ⊆ W ∨ V ⊆ W → U ∩ V ⊆ W.
+#A; #U; #V; #W; *; #H; #x; *; #xU; #xV; napply H; nassumption;
+nqed.
+
+nlemma subseteq_union_l: ∀A.∀U,V,W:Ω^A.U ⊆ W → V ⊆ W → U ∪ V ⊆ W.
+#A; #U; #V; #W; #H; #H1; #x; *; #Hx; ##[ napply H; ##| napply H1; ##] nassumption;
+nqed. 
+
+nlemma subseteq_intersection_r: ∀A.∀U,V,W:Ω^A.W ⊆ U → W ⊆ V → W ⊆ U ∩ V.
+#A; #U; #V; #W; #H1; #H2; #x; #Hx; @; ##[ napply H1; ##| napply H2; ##] nassumption;
+nqed. 
+
 (*
 nrecord isomorphism (A, B : setoid) (S: qpowerclass A) (T: qpowerclass B) : CProp[0] ≝
  { iso_f:> unary_morphism A B;