62.16 IsSemigroup

IsSemigroup( obj )

IsSemigroup returns true if the object obj is a semigroup and false otherwise. This function simply checks whether the record component obj.isSemigroup is bound and is true.

  gap> IsSemigroup( t1 );      
  false                         # a transformation is not a semigroup  
  gap> IsSemigroup( Group( (1,2,3) ) );
  false                         # a group is not a semigroup
  gap> IsSemigroup( s27 );
  true

Previous Up Top Next
Index