Computational aspects of subindices and subfactors with characterization of finite index stable groups

Abstract

Recently, sub-indices and sub-factors of groups with connections to number theory, additive combinatorics, and factorization of groups have been introduced and studied. Since all group subsets are considered in the theory and there are many basic open problems, conjectures, and questions, their computational aspects are particularly important. In this paper, by introducing some computational methods and using theoretical approaches together, we not only solve several problems but also pave the way to study the topic. As the most important result of the study, we completely characterize finite index stable groups.