X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fnlibrary%2Falgebra%2Fmagmas.ma;h=685d6248059afb3e162ae4ec00ea1304f05318af;hb=3e373f30525987b7b121ed74c8a1292dc71d185c;hp=d4a650c5eef3f72309e02219c82afe4fbf606456;hpb=b750bf57b05ae855b742ca380344d38782ac6940;p=helm.git

diff --git a/helm/software/matita/nlibrary/algebra/magmas.ma b/helm/software/matita/nlibrary/algebra/magmas.ma
index d4a650c5e..685d62480 100644
--- a/helm/software/matita/nlibrary/algebra/magmas.ma
+++ b/helm/software/matita/nlibrary/algebra/magmas.ma
@@ -16,23 +16,34 @@ include "sets/sets.ma".
 
 nrecord magma_type : Type[1] ≝
  { mtcarr:> setoid;
-   op: binary_morphism mtcarr mtcarr mtcarr
+   op: unary_morphism mtcarr (unary_morph_setoid mtcarr mtcarr)
  }.
 
 nrecord magma (A: magma_type) : Type[1] ≝
- { mcarr:> Ω \sup A;
+ { mcarr:> ext_powerclass A;
    op_closed: ∀x,y. x ∈ mcarr → y ∈ mcarr → op A x y ∈ mcarr
  }.
-(* le coercion non vanno; sospetto setoid1_of_setoid *)
+
+alias symbol "hint_decl" = "hint_decl_Type2".
+unification hint 0 ≔ 
+  A : ? ⊢ carr1 (ext_powerclass_setoid A) ≡ ext_powerclass A. 
+
+(*
+ncoercion mcarr' : ∀A. ∀M: magma A. carr1 (qpowerclass_setoid (mtcarr A))
+ ≝ λA.λM: magma A.mcarr ? M
+ on _M: magma ? to carr1 (qpowerclass_setoid (mtcarr ?)).
+*)
+
 nrecord magma_morphism_type (A,B: magma_type) : Type[0] ≝
  { mmcarr:> unary_morphism A B;
-   mmprop: ∀x,y:carr A. mmcarr (op ? x y) = op … (mmcarr x) (mmcarr y)
+   mmprop: ∀x,y:A. mmcarr (op ? x y) = op … (mmcarr x) (mmcarr y)
  }.
-(* le coercion non vanno *)
+
 nrecord magma_morphism (A) (B) (Ma: magma A) (Mb: magma B) : Type[0] ≝
  { mmmcarr:> magma_morphism_type A B;
-   mmclosed: ∀x:carr A. x ∈ mcarr ? Ma → mmmcarr x ∈ mcarr ? Mb
+   mmclosed: ∀x:A. x ∈ mcarr ? Ma → mmmcarr x ∈ mcarr ? Mb
  }.
+
 (*
 ndefinition mm_image:
  ∀A,B. ∀Ma: magma A. ∀Mb: magma B. magma_morphism … Ma Mb → magma B.
@@ -63,12 +74,12 @@ ndefinition mm_counter_image:
            nrewrite < Hy1;
            napply (mmprop … f)]##]
 nqed.
+*)
 
 ndefinition m_intersect: ∀A. magma A → magma A → magma A.
  #A; #M1; #M2;
  napply (mk_magma …)
-  [ napply (M1 ∩ M2)
+  [ napply (intersect_is_ext_morph ? M1 M2)
   | #x; #y; nwhd in ⊢ (% → % → %); *; #Hx1; #Hx2; *; #Hy1; #Hy2;
     napply conj; napply op_closed; nassumption ]
-nqed.
-*)
\ No newline at end of file
+nqed.
\ No newline at end of file