University of Sistan and BaluchestanIranian Journal of Fuzzy Systems1735-065410620131226Roughness in modules by using the notion of reference points109124133410.22111/ijfs.2013.1334ENB.DavvazDepartment of Mathematics, Yazd University, Yazd, IranA.MalekzadehDepartment of Mathematics, Yazd University, Yazd, IranJournal Article20120117 module over a ring is a general mathematical concept for many examples of mathematical<br />objects that can be added to each other and multiplied by scalar numbers.<br />In this paper, we consider a module over a ring as a universe and by using the notion of reference points, we provide local approximations for subsets of the universe.http://ijfs.usb.ac.ir/article_1334_b7e38fe14039de20ab199fb87bb13ee7.pdf