Department of Mathematics, College of Science, Al Baha University, Al Baha, KSA. Most of our notation is standard and can be found in [4]. 2. Abelian Subgroups Recall that the F C-centre of a group G ...

Abstract: In this paper, we investigate the properties of normal fuzzy subgroups of a fuzzy group. We also introduce the notion of a characteristic fuzzy subgroup of a fuzzy group, of which we provide ...