Commenced in January 2007
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Search results for: Zhaohao%20Wang
1 The Lower and Upper Approximations in a Group
Authors: Zhaohao Wang, Lan Shu
Abstract:
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 Lagranges Theorem.
Keywords: Lower approximations, Upper approximations, Rough sets, Rough groups, Lagrange
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