Bagirmaz, NurettinTasbozan, Hatice14.07.20192019-07-1614.07.20192019-07-1620190972-5555https://dx.doi.org/10.17654/NT042010077https://hdl.handle.net/20.500.12514/1222Rough set theory proposes a new mathematical approach to model vagueness. In this paper, we introduce a new definition for rough approximations with respect to the subgroups of a group, which is called the left (right) lower and upper approximations. In fact, we prove that this definition is a generalization of definition in [5]. Then we give some properties of these rough approximations.en10.17654/NT042010077info:eu-repo/semantics/closedAccessrough setsrough groupsleft (right) lower approximationleft (right) upper approximationArticle4217783WOS:000464544500007