然后把型 2拟差集推广到阿贝尔型 2拟差集 ,并得到阿贝尔型 2拟差集存在的必要条件

• Then it generalize near difference sets of type 2 to Abel near difference sets of type 2,and obtain some necessary conditions for the existence of Abel near difference sets of type 2.These conclusions are the generalizations of some known results about difference sets and near difference sets.