X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Fnlibrary%2Falgebra%2Fmagmas.ma;h=685d6248059afb3e162ae4ec00ea1304f05318af;hb=c57405141d26ac2215a07b05d27a16a691dda50e;hp=24203f2098422059a1fc6ec95396267cb5b0b91b;hpb=857a0fc157e903b1475ad6c76b03914e342fe8f6;p=helm.git

diff --git a/helm/software/matita/nlibrary/algebra/magmas.ma b/helm/software/matita/nlibrary/algebra/magmas.ma
index 24203f209..685d62480 100644
--- a/helm/software/matita/nlibrary/algebra/magmas.ma
+++ b/helm/software/matita/nlibrary/algebra/magmas.ma
@@ -16,17 +16,23 @@ 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:> qpowerclass A;
+ { mcarr:> ext_powerclass A;
    op_closed: ∀x,y. x ∈ mcarr → y ∈ mcarr → op A x y ∈ mcarr
  }.
 
+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;
@@ -73,7 +79,7 @@ nqed.
 ndefinition m_intersect: ∀A. magma A → magma A → magma A.
  #A; #M1; #M2;
  napply (mk_magma …)
-  [ napply (intersect_ok ? 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