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研究了群中子群的上近似和下近似的相关性质,指出并证明了其中3个关于上近似的性质中的包含关系实质是相等关系,从而改进了上近似的相关结论,为上近似的应用奠定了理论基础.
The related properties of upper approximation and lower approximation of group of neutron subgroups are studied. It is pointed out and proved that the inclusion relations among the three properties of the upper approximation are substantially equal, thus improving the upper approximation. Application has laid a theoretical foundation.