more theory for lists

[helm.git] / helm / software / matita / nlibrary / sets / setoids.ma

diff --git a/helm/software/matita/nlibrary/sets/setoids.ma b/helm/software/matita/nlibrary/sets/setoids.ma
index b66f4d457e9a12ed8dcc2ef1b732541467509048..e40dad6f6d20e4e3a1f7624b6f28b5d6056a6ef3 100644 (file)
--- a/helm/software/matita/nlibrary/sets/setoids.ma
+++ b/helm/software/matita/nlibrary/sets/setoids.ma
@@ -16,12 +16,26 @@ include "logic/connectives.ma".
 include "properties/relations.ma".
 include "hints_declaration.ma".
 
-nrecord setoid : Type[1] ≝
- { carr:> Type[0];
-   eq0: equivalence_relation carr
- }.
+nrecord setoid : Type[1] ≝ { 
+  carr:> Type[0];
+  eq0: equivalence_relation carr
+}.
+
+(* activate non uniform coercions on: Type → setoid *)
+unification hint 0 ≔ R : setoid;
+   MR ≟ carr R, 
+   lock ≟ mk_lock1 Type[0] MR setoid R 
+(* ---------------------------------------- *) ⊢ 
+   setoid ≡ force1 ? MR lock.
+
+notation < "[\setoid\ensp\of term 19 x]" non associative with precedence 90 for @{'mk_setoid $x}.
+interpretation "mk_setoid" 'mk_setoid x = (mk_setoid x ?).
 
 interpretation "setoid eq" 'eq t x y = (eq_rel ? (eq0 t) x y).
+(* single = is for the abstract equality of setoids, == is for concrete 
+   equalities (that may be lifted to the setoid level when needed *)
+notation < "hvbox(a break mpadded width -50% (=)= b)" non associative with precedence 45 for @{ 'eq_low $a $b }.
+notation > "a == b" non associative with precedence 45 for @{ 'eq_low $a $b }.
 
 notation > "hvbox(a break =_0 b)" non associative with precedence 45
 for @{ eq_rel ? (eq0 ?) $a $b }.
@@ -32,10 +46,14 @@ interpretation "trans" 'trans r = (trans ????? r).
 notation > ".=_0 r" with precedence 50 for @{'trans_x0 $r}.
 interpretation "trans_x0" 'trans_x0 r = (trans ????? r).
 
-nrecord unary_morphism (A,B: setoid) : Type[0] ≝
- { fun1:1> A → B;
-   prop1: ∀a,a'. a = a' → fun1 a = fun1 a'
- }.
+nrecord unary_morphism (A,B: setoid) : Type[0] ≝ { 
+  fun1:1> A → B;
+  prop1: ∀a,a'. a = a' → fun1 a = fun1 a'
+}.
+
+notation > "B ⇒_0 C" right associative with precedence 72 for @{'umorph0 $B $C}.
+notation "hvbox(B break ⇒\sub 0 C)" right associative with precedence 72 for @{'umorph0 $B $C}.
+interpretation "unary morphism 0" 'umorph0 A B = (unary_morphism A B).
 
 notation "† c" with precedence 90 for @{'prop1 $c }.
 notation "l ‡ r" with precedence 90 for @{'prop2 $l $r }.
@@ -47,7 +65,7 @@ notation "l ╪_0 r" with precedence 89 for @{'prop2_x0 $l $r }.
 interpretation "prop1_x0" 'prop1_x0 c  = (prop1 ????? c).
 
 ndefinition unary_morph_setoid : setoid → setoid → setoid.
-#S1; #S2; @ (unary_morphism S1 S2); @;
+#S1; #S2; @ (S1 ⇒_0 S2); @;
 ##[ #f; #g; napply (∀x,x'. x=x' → f x = g x');
 ##| #f; #x; #x'; #Hx; napply (.= †Hx); napply #;
 ##| #f; #g; #H; #x; #x'; #Hx; napply ((H … Hx^-1)^-1);
@@ -57,19 +75,19 @@ nqed.
 alias symbol "hint_decl" (instance 1) = "hint_decl_Type1".
 unification hint 0 ≔ o1,o2 ; 
      X ≟ unary_morph_setoid o1 o2
-  (* ------------------------------ *) ⊢ 
-     carr X ≡ unary_morphism o1 o2.
+  (* ----------------------------- *) ⊢ 
+     carr X ≡ o1 ⇒_0 o2.
 
 interpretation "prop2" 'prop2 l r = (prop1 ? (unary_morph_setoid ??) ? ?? l ?? r).
 interpretation "prop2_x0" 'prop2_x0 l r = (prop1 ? (unary_morph_setoid ??) ? ?? l ?? r).
 
-nlemma unary_morph_eq: ∀A,B.∀f,g: unary_morphism A B. (∀x. f x = g x) → f=g.
+nlemma unary_morph_eq: ∀A,B.∀f,g:A ⇒_0 B. (∀x. f x = g x) → f = g.
 #A B f g H x1 x2 E; napply (.= †E); napply H; nqed.
 
 nlemma mk_binary_morphism:
  ∀A,B,C: setoid. ∀f: A → B → C. (∀a,a',b,b'. a=a' → b=b' → f a b = f a' b') →
-  unary_morphism A (unary_morph_setoid B C).
- #A; #B; #C; #f; #H; @ [ #x; @ (f x) ] #a; #a'; #Ha [##2: napply unary_morph_eq; #y]
+  A ⇒_0 (unary_morph_setoid B C).
+ #A; #B; #C; #f; #H; @; ##[ #x; @ (f x) ] #a; #a'; #Ha [##2: napply unary_morph_eq; #y]
  /2/.
 nqed.
 
@@ -79,24 +97,25 @@ ndefinition composition ≝
 interpretation "function composition" 'compose f g = (composition ??? f g).
 
 ndefinition comp_unary_morphisms:
- ∀o1,o2,o3:setoid.
-  unary_morphism o2 o3 → unary_morphism o1 o2 →
-   unary_morphism o1 o3.
+ ∀o1,o2,o3:setoid.o2 ⇒_0 o3 → o1 ⇒_0 o2 → o1 ⇒_0  o3.
 #o1; #o2; #o3; #f; #g; @ (f ∘ g);
  #a; #a'; #e; nnormalize; napply (.= †(†e)); napply #.
 nqed.
 
-unification hint 0 ≔ o1,o2,o3:setoid,f:unary_morphism o2 o3,g:unary_morphism o1 o2;
-   R ≟ mk_unary_morphism ?? (composition … f g)
-        (prop1 ?? (comp_unary_morphisms o1 o2 o3 f g))
+unification hint 0 ≔ o1,o2,o3:setoid,f:o2 ⇒_0 o3,g:o1 ⇒_0 o2;
+   R ≟ mk_unary_morphism o1 o3 
+        (composition ??? (fun1 o2 o3 f) (fun1 o1 o2 g))
+        (prop1 o1 o3 (comp_unary_morphisms o1 o2 o3 f g))
  (* -------------------------------------------------------------------- *) ⊢
-                              fun1 ?? R ≡ (composition … f g).
+    fun1 o1 o3 R ≡ composition ??? (fun1 o2 o3 f) (fun1 o1 o2 g).
 
-ndefinition comp_binary_morphisms:
- ∀o1,o2,o3.
-  unary_morphism (unary_morph_setoid o2 o3)
-   (unary_morph_setoid (unary_morph_setoid o1 o2) (unary_morph_setoid o1 o3)).
+ndefinition comp_binary_morphisms: 
+  ∀o1,o2,o3.(o2 ⇒_0 o3) ⇒_0 ((o1 ⇒_0 o2) ⇒_0 (o1 ⇒_0 o3)).
 #o1; #o2; #o3; napply mk_binary_morphism
- [ #f; #g; napply (comp_unary_morphisms … f g) (*CSC: why not ∘?*)
+ [ #f; #g; napply (comp_unary_morphisms ??? f g) 
+         (* CSC: why not ∘? 
+            GARES: because the coercion to FunClass is not triggered if there
+                   are no "extra" arguments. We could fix that in the refiner
+         *)
  | #a; #a'; #b; #b'; #ea; #eb; #x; #x'; #Hx; nnormalize; /3/ ]
 nqed.