PERFECTLY STABLE AND NORMAL SUBGROUPS Shant Navasardyan
The equivalence between the concepts of normal and perfectly stable subgroups is shown. The proof of the main theorem is based on a novel concept of hypergroups over a group.
DOI: 10.46991/PYSU:A/2022.56.1.027 Physical and Mathematical Sciences, 56(1 (257) 27-32