... 左单位元 left identity 半群法 semigroup method 半群性 semigroup property ...
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operator semigroup method 算子半群方法
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In this paper, based on the relation between normal subgroup and congruence, another depiction of normal series power semigroup is given from the angles of congruence by the method of analogy.
首先在正规子群与同余的关系的基础上，采用类比的方法，从同余的角度给出了群的正规列幂半群的另一种刻画。
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