Nianfu Liu
Abstract
Based on the Rough theory, a rough subgroup with respect to a normal subgroup of a group is discussed, and some properties of the lower and the upper approximations in a group are studied.
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Based on the Rough theory, a rough subgroup with respect to a normal subgroup of a group is discussed, and some properties of the lower and the upper approximations in a group are studied.
Key concepts: Mathematics, Index of a subgroup, Normal subgroup, Group (periodic table), Characteristic subgroup, Maximal subgroup, Fitting subgroup, Subgroup analysis