The inductive Alperin weight condition for finite categories

From papers

Let pp be a prime, let kk be an algebraic closure of Fp\mathbb{F}_p, and let C\mathcal{C} be a finite category. Let Aut(C)\operatorname{Aut}(\mathcal{C}) denote its automorphism group. If C\mathcal{C} is an EI-category, let bb be a central idempotent of kCk\mathcal{C} and let Aut(C)b\operatorname{Aut}(\mathcal{C})_b denote its stabiliser. Inductive Alperin weight condition. (i) For any finite category C\mathcal{C}, there exists a bijection

S(kC)W(kOC)\mathcal{S}(k\mathcal{C})\to\mathcal{W}(k\mathcal{O}_{\mathcal{C}})

commuting with the action of Aut(C)\operatorname{Aut}(\mathcal{C}). (ii) For any finite EI-category C\mathcal{C} and any central idempotent bb of kCk\mathcal{C}, there exists a bijection

S(kCb)W(kOC,b)\mathcal{S}(k\mathcal{C}b)\to\mathcal{W}(k\mathcal{O}_{\mathcal{C}},b)

commuting with the action of Aut(C)b\operatorname{Aut}(\mathcal{C})_b. This is the category-algebra extension proposed after the finite-group inductive condition; the paper does not report a resolution.

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Sources & referencesView supporting material

Primary source

Xin Huang, “The Galois Alperin weight conjecture for finite category algebras”, arXiv:2604.06166 (2026).

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