Classes of Subgroups of a finite group with isomorphic quotient groups

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.

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BibTeX RIS

BibTeX

@misc{halder2026classes,
  title = {{Classes of Subgroups of a finite group with isomorphic quotient groups}},
  author = {Tushar Halder and Sachin Ballal},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.13076},
  eprint = {2610.13076},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.13076},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Classes of Subgroups of a finite group with isomorphic quotient groups
AU  - Tushar Halder
AU  - Sachin Ballal
PY  - 2026
DA  - 2026/10/14
PB  - arXiv
DO  - 10.48550/arxiv.2610.13076
UR  - https://arxiv.org/abs/2610.13076
AB  - 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.
ER  -

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