Year: 2026
Type: preprint
Abstract: In this paper, we study the poset QIso(G) of classes of subgroups of a finite group G having isomorphic quotients. Particularly, we study it for finite abelian groups and for some classes of non-abelian metacyclic groups, namely dihedral groups Dn, the group U2np and affine groups Aff(F) over finite field F. In the case of abelian groups G, we show that there exists a duality from QIso(G) to Iso(G). We show that cyclic groups are the only groups for which QIso(G), up to duality is isomorphic to its subgroup lattice. We also show that cyclic groups are the only nilpotent groups for which QIso(G), up to duality is isomorphic to its lattice of normal subgroups. We characterize finite 2-groups all of whose subgroups are q-self dual with QIso(G) being a chain. We also characterize all p-groups G of order at most p4 whose QIso(G) is a chain.
Source: arXiv (Cornell University)
Authors: Halder, Tushar, Ballal, Sachin
Institution: University of Hyderabad
Language: English
Topic: Finite Group Theory Research
Subfield: Discrete Mathematics and Combinatorics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221526984