X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fmatita%2Flibrary%2Falgebra%2Fsemigroups.ma;h=af5e01e06c0bb1064271b90c6565d591c9e5b011;hb=0e9f9d6d7a0466ee132553fb7a983eac282fb12f;hp=12ff9531155cc31d19e9aecb8b2a44bb8ba4885f;hpb=7815a9150b5581f60e49ad6520f46ac287e073fa;p=helm.git

diff --git a/helm/software/matita/library/algebra/semigroups.ma b/helm/software/matita/library/algebra/semigroups.ma
index 12ff95311..af5e01e06 100644
--- a/helm/software/matita/library/algebra/semigroups.ma
+++ b/helm/software/matita/library/algebra/semigroups.ma
@@ -12,30 +12,23 @@
 (*                                                                        *)
 (**************************************************************************)
 
-set "baseuri" "cic:/matita/algebra/semigroups".
-
 include "higher_order_defs/functions.ma".
 
 (* Magmas *)
 
-record Magma : Type ≝
+record Magma : Type≝
  { carrier:> Type;
    op: carrier → carrier → carrier
  }.
 
-notation "hvbox(a break \middot b)" 
-  left associative with precedence 55
-for @{ 'magma_op $a $b }.
-
-interpretation "magma operation" 'magma_op a b =
- (cic:/matita/algebra/semigroups/op.con _ a b).
+interpretation "magma operation" 'middot a b = (op _ a b).
 
 (* Semigroups *)
 
-record isSemiGroup (M:Magma) : Prop ≝
+record isSemiGroup (M:Magma) : Prop≝
  { op_associative: associative ? (op M) }.
 
-record SemiGroup : Type ≝
+record SemiGroup : Type≝
  { magma:> Magma;
    semigroup_properties:> isSemiGroup magma
  }.
@@ -51,6 +44,6 @@ theorem is_left_unit_to_is_right_unit_to_eq:
   is_left_unit ? e → is_right_unit ? e' → e=e'.
  intros;
  rewrite < (H e');
- rewrite < (H1 e) in \vdash (? ? % ?);
+ rewrite < (H1 e) in \vdash (? ? % ?).
  reflexivity.
 qed.