从半环同态的角度出发，给出了半模的一个等价定义。
In this paper, give an equivalent definition of semi-module.
本文在引入半环概念的基础上，介绍半环同态、同余关系、单同余半环等概念，讨论两个同态半环之间单同余性质的关系。
This paper introduces the concept of semirings, homomorphism of semirings and congruence simple semirings, discusses the relation between two semirings.
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