引入并研究了半环上的几个特殊同余;从不同角度给出了加法半群为正则纯整群(纯整密群,正则纯整密群)的半环的次直积分解,并讨论了这些半环之间的关系。
The properties of orthogroup were studied, and its decomposition of subdirect products from different angles was characterized.