Separable cowreaths in higher dimension

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 four-dimensional Clifford algebra, and $H=H_4$, Sweedler's Hopf algebra, the cowreath $(A \otimes H^{op},H, ψ)$ is always (h-)separable. We show how to produce similar examples in higher dimension by considering a $2^{n+1}$-dimensional Clifford algebra $A=Cl(α,β_i,γ_i,λ_{ij})$ and $H=E(n)$, a suitable pointed Hopf algebra that generalizes $H_4$. We adopt the approach pursued in [19], requiring that the separability morphism be of a simplified form, which in turn forces the defining scalars $α,β_i,γ_i,λ_{ij}$ to satisfy further conditions.

Publication Details

Journal
ArXiv.org
Published
2025-06-23
Primary Topic
Algebraic and Geometric Analysis
Type
article
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article

Separable cowreaths in higher dimension

ArXiv.org
Algebraic and Geometric Analysis
article

Separable cowreaths in higher dimension

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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 four-dimensional Clifford algebra, and $H=H_4$, Sweedler's Hopf algebra, the cowreath $(A \otimes H^{op},H, ψ)$ is always (h-)separable. We show how to produce similar examples in higher dimension by considering a $2^{n+1}$-dimensional Clifford algebra $A=Cl(α,β_i,γ_i,λ_{ij})$ and $H=E(n)$, a suitable pointed Hopf algebra that generalizes $H_4$. We adopt the approach pursued in [19], requiring that the separability morphism be of a simplified form, which in turn forces the defining scalars $α,β_i,γ_i,λ_{ij}$ to satisfy further conditions.

ArXiv.org
Openalex Percentile: Top 39%
Algebraic and Geometric Analysis
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Separable cowreaths in higher dimension · ArXiv.org (2025) | TGRS Research Map | TGRS