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

diff --git a/helm/software/matita/nlibrary/sets/sets.ma b/helm/software/matita/nlibrary/sets/sets.ma
index 239d9765989b05867a552d217c32acc564002152..3e63bf8f2574fee8eba104a243c6176e83832e39 100644 (file)
--- a/helm/software/matita/nlibrary/sets/sets.ma
+++ b/helm/software/matita/nlibrary/sets/sets.ma
@@ -34,9 +34,9 @@ interpretation "intersect" 'intersects U V = (intersect ? U V).
 ndefinition union ≝ λA.λU,V:Ω \sup A.{ x | x ∈ U ∨ x ∈ V }.
 interpretation "union" 'union U V = (union ? U V).
 
-ndefinition big_union ≝ λA.λT:Type[0].λf:T → Ω \sup A.{ x | ∃i. x ∈ f i }.
+ndefinition big_union ≝ λA,B.λT:Ω \sup A.λf:A → Ω \sup B.{ x | ∃i. i ∈ T ∧ x ∈ f i }.
 
-ndefinition big_intersection ≝ λA.λT:Type[0].λf:T → Ω \sup A.{ x | ∀i. x ∈ f i }.
+ndefinition big_intersection ≝ λA,B.λT:Ω \sup A.λf:A → Ω \sup B.{ x | ∀i. i ∈ T → x ∈ f i }.
 
 ndefinition full_set: ∀A. Ω \sup A ≝ λA.{ x | True }.
 (* bug dichiarazione coercion qui *)
@@ -80,6 +80,13 @@ nrecord qpowerclass (A: setoid) : Type[1] ≝
    mem_ok': ∀x,x':A. x=x' → (x ∈ pc) = (x' ∈ pc) 
  }.
 
+ndefinition Full_set: ∀A. qpowerclass A.
+ #A; napply mk_qpowerclass
+  [ napply (full_set A)
+  | #x; #x'; #H; nnormalize in ⊢ (?%?%%); (* bug universi qui napply refl1;*)
+    napply mk_iff; #K; nassumption ]
+nqed.
+
 ndefinition qseteq: ∀A. equivalence_relation1 (qpowerclass A).
  #A; napply mk_equivalence_relation1
   [ napply (λS,S':qpowerclass A. eq_rel1 ? (eq1 (powerclass_setoid A)) S S')
@@ -198,16 +205,27 @@ nlemma first_omomorphism_theorem_functions1:
  #A; #B; #f; #x; napply refl;
 nqed.
 
-ndefinition surjective ≝ λA,B.λf:unary_morphism A B. ∀y.∃x. f x = y.
+ndefinition surjective ≝
+ λA,B.λS: qpowerclass A.λT: qpowerclass B.λf:unary_morphism A B.
+  ∀y. y ∈ T → ∃x. x ∈ S ∧ f x = y.
 
-ndefinition injective ≝ λA,B.λf:unary_morphism A B. ∀x,x'. f x = f x' → x = x'.
+ndefinition injective ≝
+ λA,B.λS: qpowerclass A.λf:unary_morphism A B.
+  ∀x,x'. x ∈ S → x' ∈ S → f x = f x' → x = x'.
 
 nlemma first_omomorphism_theorem_functions2:
- ∀A,B.∀f: unary_morphism A B. surjective ?? (canonical_proj ? (eqrel_of_morphism ?? f)).
- #A; #B; #f; nwhd; #y; napply (ex_intro … y); napply refl.
+ ∀A,B.∀f: unary_morphism A B. surjective ?? (Full_set ?) (Full_set ?) (canonical_proj ? (eqrel_of_morphism ?? f)).
+ #A; #B; #f; nwhd; #y; #Hy; napply (ex_intro … y); napply conj
+  [ napply I | napply refl]
 nqed.
 
 nlemma first_omomorphism_theorem_functions3:
- ∀A,B.∀f: unary_morphism A B. injective ?? (quotiented_mor ?? f).
- #A; #B; #f; nwhd; #x; #x'; #H; nassumption.
+ ∀A,B.∀f: unary_morphism A B. injective ?? (Full_set ?) (quotiented_mor ?? f).
+ #A; #B; #f; nwhd; #x; #x'; #Hx; #Hx'; #K; nassumption.
 nqed.
+
+nrecord isomorphism (A) (B) (S: qpowerclass A) (T: qpowerclass B) : CProp[0] ≝
+ { iso_f:> unary_morphism A B;
+   f_sur: surjective ?? S T iso_f;
+   f_inj: injective ?? S iso_f
+ }.