| 报告题目： | Rad-Projective Delta-Covers |
| 报 告 人： | Prof. M.F. Yousif |
| The Ohio State University, USA | |
| 报告时间： | 5月14日(周三)下午2：00-3：00 |
| 报告地点： | 九龙湖数学系第一报告厅 |
| 相关介绍： | Abstract: In generalizing the well-established notion of projective cover, the notions of D3-cover and rad-projective cover were introduced in [1] and [2], and new characterizations of perfect and semiperfect rings were pro- vided. On the other hand, Y. Zhou in [4] introduced and studied the notions of -cover, -perfect and -semiperfect rings. In this talk we combine and generalize these notions and introduce the new notions of rad-projective - cover and D3--cover. New characterizations of -perfect and -semiperfect rings are provided. |
