English

Separable cowreaths in higher dimension

Quantum Algebra 2025-06-24 v1 Category Theory Rings and Algebras

Abstract

In this paper we present an infinite family of (h-)separable cowreaths with increasing dimension. Menini and Torrecillas proved in [20] that for A=Cl(α,β,γ)A=Cl(\alpha,\beta, \gamma), a four-dimensional Clifford algebra, and H=H4H=H_4, Sweedler's Hopf algebra, the cowreath (AHop,H,ψ)(A \otimes H^{op},H, \psi) is always (h-)separable. We show how to produce similar examples in higher dimension by considering a 2n+12^{n+1}-dimensional Clifford algebra A=Cl(α,βi,γi,λij)A=Cl(\alpha,\beta_i,\gamma_i,\lambda_{ij}) and H=E(n)H=E(n), a suitable pointed Hopf algebra that generalizes H4H_4. We adopt the approach pursued in [19], requiring that the separability morphism be of a simplified form, which in turn forces the defining scalars α,βi,γi,λij\alpha,\beta_i,\gamma_i,\lambda_{ij} to satisfy further conditions.

Keywords

Cite

@article{arxiv.2506.18762,
  title  = {Separable cowreaths in higher dimension},
  author = {Fabio Renda},
  journal= {arXiv preprint arXiv:2506.18762},
  year   = {2025}
}

Comments

32 Pages

R2 v1 2026-07-01T03:29:42.448Z