Divisibility and symmetry conjecture for links in Hopf algebras with the dual Chevalley property

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Let HH be a non-cosemisimple Hopf algebra over k\Bbbk with the dual Chevalley property. Let M\mathcal{M} denote the set of simple subcoalgebras of HH, and let P\mathcal{P} be the relevant set of paths or links between simple subcoalgebras, with ∣1P∣\mid{}^{1}\mathcal{P}\mid, ∣CP∣\mid{}^{\mathcal{C}}\mathcal{P}\mid, and ∣PC∣\mid\mathcal{P}{}^{\mathcal{C}}\mid denoting the corresponding cardinalities for C∈M\mathcal{C}\in\mathcal{M}. Divisibility and symmetry conjecture. For every C∈M\mathcal{C}\in\mathcal{M},

∣1P∣∣∣CP∣.\mid{}^{1}\mathcal{P}\mid \big| \mid{}^{\mathcal{C}}\mathcal{P}\mid.

Moreover,

∣CP∣=∣PC∣.\mid{}^{\mathcal{C}}\mathcal{P}\mid=\mid\mathcal{P}{}^{\mathcal{C}}\mid.

The conjecture is proposed to guide further research on Hopf algebras with the dual Chevalley property; the supplied source does not state a resolution, so the divisibility and equality assertions remain open.

References

Primary source

Jing Yu, Kangqiao Li and Gongxiang Liu, “Hopf algebras with the dual Chevalley property of finite corepresentation type”, arXiv:2308.09553 (2025).

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