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 [19] that for A = C l ( α , β , γ ) , a four-dimensional Clifford algebra, and H = H 4 , Sweedler's Hopf algebra, the cowreath ( A ⊗ H o p , 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 = C l ( α , β i , γ i , λ i j ) and H = E ( n ) , a suitable pointed Hopf algebra that generalizes H 4 . We adopt the approach pursued in [18] , requiring that the separability element be of a simplified form, which in turn forces the defining scalars α , β i , γ i , λ i j to satisfy further conditions.

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Publication Details

Journal
Journal of Algebra
Published
2025-10-28
DOI
https://doi.org/10.1016/j.jalgebra.2025.10.031
Primary Topic
Algebraic and Geometric Analysis
Type
article
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article

Separable cowreaths in higher dimension

Fabio Renda
Journal of Algebra
Algebraic and Geometric Analysis
article

Separable cowreaths in higher dimension

Fabio Renda
article en

Abstract

In this paper we present an infinite family of (h-)separable cowreaths with increasing dimension. Menini and Torrecillas proved in [19] that for A = C l ( α , β , γ ) , a four-dimensional Clifford algebra, and H = H 4 , Sweedler's Hopf algebra, the cowreath ( A ⊗ H o p , 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 = C l ( α , β i , γ i , λ i j ) and H = E ( n ) , a suitable pointed Hopf algebra that generalizes H 4 . We adopt the approach pursued in [18] , requiring that the separability element be of a simplified form, which in turn forces the defining scalars α , β i , γ i , λ i j to satisfy further conditions.

Journal of AlgebraVol. 689
University of Ferrara (IT)
Openalex Percentile: Top 57%
Algebraic and Geometric Analysis
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