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arXiv · 2401.12704

Quandles as pre-Lie skew braces, set-theoretic Hopf algebras & universal R-matrices

Anastasia Doikou·Bernard Rybolowicz·Paola Stefanelli
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Abstract

We present connections between left non-degenerate solutions of the set-theoretic braid equation and left shelves using Drinfel'd homomorphisms. We generalize the notion of affine quandle, by using heap endomorphisms and metahomomorphisms, and identify the underlying Yang-Baxter algebra for solutions of the braid equation associated to a given quandle. We introduce the notion of the pre-Lie skew brace and identify certain affine quandles that give rise to pre-Lie skew braces. Generalisations of the braiding of a group, associated to set-theoretic solutions of the braid equation are also presented. These generalized structures encode part of the underlying Hopf algebra. We then introduce the quasi-triangular (quasi) Hopf algebras and universal R-matrices for rack and set-theoretic algebras. Generic set-theoretic solutions coming from heap endomorphisms are also identified.

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BibTeXRIS

Anastasia Doikou, Bernard Rybolowicz, Paola Stefanelli. 2024-01-23. Quandles as pre-Lie skew braces, set-theoretic Hopf algebras & universal R-matrices. https://doi.org/10.1088/1751-8121/ad7769

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