Computation of near approximations in groups with respect to the normal subgroups.

In this paper we introduce an algorithm to do the computation of near lower and near upper approximations in groups with respect to the normal subgroups. We consider dihedral group D6 and abelian group ℤ36. We implement the algorithm in SageMath. Since if we compute manually, the possibility of miscalculation is quite large, the algorithm is become very helpful for computing to show the zero mistake. [ABSTRACT FROM AUTHOR]