您要查找的是不是：
- idempotent semigroup 幂等半群
- It follows that every nonempty periodic semigroup has at least one idempotent. 得出了所有非空周期半群都有至少一个幂等元。
- For example, every nonempty finite semigroup is periodic, and has a minimal ideal and at least one idempotent. 例如，所有非空有限半群是周期性的，并有一个极小理想和至少一个幂等元。
- The maximum idempotent - separating congruence on a S - semigroup is characterized and a fundamental representation of a such semigroup is given. 刻划了S-正则半群上的极大幂等元分离同余并给每个S-正则半群一个基本表示。
- Sufficient and neccessary conditions for a semigroup S in whicheach left or right translation is idempotent are given. As a corrollary, when S is commutative, its structure is described. 给出了半群中每左平移或右平移均为幂等元的充分必要条件.;作为推论，得出了此类交换半群的一个结构刻划
- Abstract： Sufficient and neccessary conditions for a semigroup S in which each left or right translation is idempotent are given.As a corrollary, when S is commutative, its structure is described. 摘 要： 给出了半群中每左平移或右平移均为幂等元的充分必要条件.;作为推论，得出了此类交换半群的一个结构刻划
- The "get" method should be used when the form is idempotent (i.e. 上面几句话在我们的实际运用中有什么作用呢？
- This method does not need to be either safe or idempotent. 该方法不需要安全或者等幂。
- The latter two published a monograph on semigroup theory in 1961. 后面二人在 1961 年出版了半群理论的专论。
- This idempotent ultrafilter enables us to find an appropriate infinite set. 这个幂等的超滤子能使我们找到一个适当的无限集。
- A construction theorem for such semigroup is obtained. 给出该类半群的一个构造定理.
- If it is finite and nonempty, then it must contain at least one idempotent. 如果它是有限和非空的，则它必须包含至少一个幂等元。
- The closure is idempotent : the closure of the closure equals the closure. 闭包是幂等 的: 闭包的闭包等于闭包。
- A semigroup generated by a single element is said to be monogenic (or cyclic ). 被一个单一元素生成的半群叫做 单基因 的(或 循环 的)。
- The minimal ideal of a commutative semigroup, when it exists, is a group. 交换半群的极小理想如果存在的话是个群。
- A semigroup is said to be periodic if all of its elements are of finite order. 半群被称为 周期性 的，如果所有它的元素有着有限次序。
- It is proved that every nonzero ideal in a finite-dimensional semi-simple algebra over a field is generated by an unique central idempotent. 证明了域上有限维半单代数的每一个非零理想由唯一的中心幂等元生成。
- For example, a service that inquires about the progress of an order is both safe and idempotent. 比如,查询订单进展情况的服务既是安全的也是幂等的。
- Functions that satisfy these conditions are called deterministic or idempotent functions. 满足这些条件的函数称为确定型或等幂函数。
- This paper gives the Bellman inequalities of idempotent matrix on the some conditions. 给出了幂等矩阵在一定条件下的Bellman不等式
