X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=matita%2Flibrary%2Falgebra%2Fsemigroups.ma;h=12ff9531155cc31d19e9aecb8b2a44bb8ba4885f;hb=f7137d4c9643a496396c5335116179087205ac05;hp=73099286ba7350a1148d6f46afa692c84c9e871c;hpb=a203c2900bfe3a9d9f1a845641863f9f3cbcac5e;p=helm.git

diff --git a/matita/library/algebra/semigroups.ma b/matita/library/algebra/semigroups.ma
index 73099286b..12ff95311 100644
--- a/matita/library/algebra/semigroups.ma
+++ b/matita/library/algebra/semigroups.ma
@@ -23,10 +23,6 @@ record Magma : Type ≝
    op: carrier → carrier → carrier
  }.
 
-notation < "M" for @{ 'carrier $M }.
-interpretation "carrier coercion" 'carrier S =
- (cic:/matita/algebra/semigroups/carrier.con S).
-
 notation "hvbox(a break \middot b)" 
   left associative with precedence 55
 for @{ 'magma_op $a $b }.
@@ -44,10 +40,6 @@ record SemiGroup : Type ≝
    semigroup_properties:> isSemiGroup magma
  }.
  
-notation < "S" for @{ 'magma $S }.
-interpretation "magma coercion" 'magma S =
- (cic:/matita/algebra/semigroups/magma.con S).
- 
 definition is_left_unit ≝
  λS:SemiGroup. λe:S. ∀x:S. e·x = x.