X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Flibrary%2Falgebra%2Fsemigroups.ma;h=539228c8cdef6d600e5741397ce5d3a4020d4275;hb=0b69be40774bf7f75c8ed8a75c02998437ebbdbb;hp=12ff9531155cc31d19e9aecb8b2a44bb8ba4885f;hpb=9e32b487a1343ead9069ea76e40515ceb19d26d6;p=helm.git

diff --git a/matita/library/algebra/semigroups.ma b/matita/library/algebra/semigroups.ma
index 12ff95311..539228c8c 100644
--- a/matita/library/algebra/semigroups.ma
+++ b/matita/library/algebra/semigroups.ma
@@ -18,7 +18,7 @@ include "higher_order_defs/functions.ma".
 
 (* Magmas *)
 
-record Magma : Type ≝
+record Magma : Type≝
  { carrier:> Type;
    op: carrier → carrier → carrier
  }.
@@ -32,10 +32,10 @@ interpretation "magma operation" 'magma_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 +51,6 @@ 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.