2014/10/18 by Seth Shelley-Abrahamson, Shelley-Abrahamson, Seth
Mathematics · #Algebraic structures and combinatorial models #FOS: Mathematics #Finite Group Theory Research #Homotopy and Cohomology in Algebraic Topology #Representation Theory (math.RT)
paper · pdf · doi:10.48550/arxiv.1410.5007
openalex publication_date 2014/10/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
For a finite group G one may consider the associated tower Sn[G] of wreath product groups. Zelevinsky associates to such a tower a positive self-adjoint Hopf algebra (PSH-algebra) R(G) as the infinite direct sum of the Grothendieck groups of the categories of complex representations of these groups. In this paper, we study the interaction via induction and restriction of the PSH-algebras R(G) and R(H) for subgroups H of G. A class of Hopf modules over PSH-algebras with a compatibility between the comultiplication and multiplication involving the Hopf kth-power map arise naturally and are studied independently. We also give an explicit formula for the natural PSH-algebra morphisms between R(H) and R(G) arising from induction and restriction. In an appendix, we consider the more general family of restricted wreath products, which are subgroups of wreath product groups analogous to the subgroups G(m, p, n) of the wreath product cyclotomic complex reflection groups G(m, 1, n).