基于一般二元关系下的粗糙Vague集,定义了半群上的Vague同余关系,给出了Vague集在Vague关系下的上、下近似,并研究了这个半群上Vague粗糙性.
This paper gives a definition to the concepts of Vague congruence on a semigroup and upper (resp. lower) approximation operators of the Vague set based on the vague congruence, and studies the Vague roughness in semigroup.