The lower and upper approximations in a group
نویسندگان
چکیده
In this paper, we generalize some propositions in [C.Z. Wang, D.G. Chen, A short note on some properties of rough groups, Comput. Math. Appl. 59(2010)431-436.] and we give some equivalent conditions for rough subgroups. The notion of minimal upper rough subgroups is introduced and a equivalent characterization is given, which implies the rough version of Lagrange′s Theorem. Keywords—Lower approximations; Upper approximations; Rough sets; Rough groups; Lagrange′s Theorem.
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تاریخ انتشار 2012