English

Note on a magic rectangle set on dihedral group

Combinatorics 2026-05-14 v1

Abstract

Let Γ\Gamma be a group of order mnkmnk and MRSΓ(m,n;k)=(ai,js)m×nMRS_{\Gamma}(m,n;k)=(a_{i,j}^s)_{m\times n} be a collection of kk arrays m×nm\times n whose entries are all distinct elements of Γ\Gamma. If there exist elements ρ,σΓ\rho,\sigma\in\Gamma such that for every row ii, there exists an ordering of elements such that ai,j1sai,j2sai,jn1sai,jns=ρ a_{i,j_1}^s a_{i,j_2}^s \dots a_{i,j_{n-1}}^s a_{i,j_n}^s= \rho and for every column jj there exists an ordering of elements such that ai1,jsai2,jsaim1,jsaim,js=σ, a_{i_1,j}^s a_{i_2,j}^s \dots a_{i_{m-1},j}^s a_{i_m,j}^s = \sigma, then MRSΓ(m,n;k)MRS_{\Gamma}(m,n;k) is called a \emph{Γ\Gamma-magic rectangle set}. We investigate magic rectangle sets over dihedral groups and prove that MRSΓ(m,n;k)\mathrm{MRS}_{\Gamma}(m,n;k) exists for every dihedral group Γ\Gamma of order mnkmnk, provided that mm and nn are even. As a consequence, we obtain broad existence results for magic rectangles and magic squares over dihedral groups.

Cite

@article{arxiv.2605.13393,
  title  = {Note on a magic rectangle set on dihedral group},
  author = {Sylwia Cichacz},
  journal= {arXiv preprint arXiv:2605.13393},
  year   = {2026}
}