English

Groups of permutations that are even on maximal proper subsets, and related monoids

Rings and Algebras 2026-05-13 v1

Abstract

Let nn be a positive integer and let [n]={1,2,,n}[n]=\{1,2,\ldots,n\}. Let Γn\Gamma_n denote the group of permutations on [n][n] whose restrictions to maximal proper subsets of [n][n] are even, let Σn\Sigma_n denote the monoid of transformations on [n][n] whose injective restrictions to maximal proper subsets of [n][n] are even and let Δn\Delta_n denote the submonoid of Σn\Sigma_n generated by transformations of rank at least n1n-1. In this paper, we present descriptions of Γn\Gamma_n, Δn\Delta_n and Σn\Sigma_n, determine their cardinalities and ranks, and provide minimal generating sets for each of them.

Keywords

Cite

@article{arxiv.2605.12342,
  title  = {Groups of permutations that are even on maximal proper subsets, and related monoids},
  author = {Vítor H. Fernandes},
  journal= {arXiv preprint arXiv:2605.12342},
  year   = {2026}
}