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 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 QIso(G) and Iso(G) are isomorphic. We show that cyclic groups are the only groups for which QIso(G) is isomorphic to its subgroup lattice. We also show that cyclic groups are the only nilpotent groups for which QIso(G) and its lattice of normal subgroups are isomorphic. 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.