科研之友
微信
新浪微博
Facebook
分享链接
摘要
Let be an equivalence on X and let denote the semigroup (under composition) of all , such that . In this paper, we endow the semigroup with a well-known natural partial order and provide a characterization for and prove necessary and sufficient conditions for to be both left and right compatible with the multiplication. We also describe the minimal and the maximal elements of with respect to this order.
- 出版日期2018-12
- 单位河南理工大学
