Wreath determinants for group-subgroup pairs

Kei Hamamoto, Kazufumi Kimoto, Kazutoshi Tachibana, Masato Wakayama

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1 Citation (Scopus)

Abstract

The aim of the present paper is to generalize the notion of the group determinants for finite groups. For a finite group G and its subgroup H, one may define a rectangular matrix of size #H×#G by X=(xhg-1)h∈H,g∈G, where {xg|g∈G} are indeterminates indexed by the elements in G. Then, we define an invariant Θ(G, H) for a given pair (G, H) by the k-wreath determinant of the matrix X, where k is the index of H in G. The k-wreath determinant of an n by kn matrix is a relative invariant of the left action by the general linear group of order n and of the right action by the wreath product of two symmetric groups of order k and n. Since the definition of Θ(G, H) is ordering-sensitive, the representation theory of symmetric groups is naturally involved. When G is abelian, if we specialize the indeterminates to powers of another variable q suitably, then Θ(G, H) factors into the product of a power of q and polynomials of the form 1-qr for various positive integers r. We also give examples for non-abelian group-subgroup pairs.

Original languageEnglish
Pages (from-to)76-96
Number of pages21
JournalJournal of Combinatorial Theory. Series A
Volume133
DOIs
Publication statusPublished - Jul 1 2015

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • Discrete Mathematics and Combinatorics
  • Computational Theory and Mathematics

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