Roughness in modules by using the notion of reference points
Bijan Davvaz, A Malekzadeh · Iranian journal of fuzzy systems · 2013
A module over a ring is a general mathematical concept for many examples of mathematical objects that can be added to each other and mul- tiplied by scalar numbers. 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.