@article{(Open Science Index):https://publications.waset.org/pdf/9259, title = {The Lower and Upper Approximations in a Group}, author = {Zhaohao Wang and Lan Shu}, country = {}, institution = {}, 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. }, journal = {International Journal of Mathematical and Computational Sciences}, volume = {6}, number = {8}, year = {2012}, pages = {1147 - 1151}, ee = {https://publications.waset.org/pdf/9259}, url = {https://publications.waset.org/vol/68}, bibsource = {https://publications.waset.org/}, issn = {eISSN: 1307-6892}, publisher = {World Academy of Science, Engineering and Technology}, index = {Open Science Index 68, 2012}, }