Sylow-AWC conjecture

Fix a prime pp. Let GAG\unlhd A be finite groups, let PP be a Sylow pp-subgroup of GG, and write IBr(H)\operatorname{IBr}(H) for the set of pp-Brauer characters of a group HH. Sylow-AWC conjecture. There is an NA(P)\operatorname{N}_A(P)-invariant subgroup

NG(P)MG,\operatorname{N}_G(P)\leq M\leq G,

with M<GM<G whenever PP is not normal in GG, and an NA(P)\operatorname{N}_A(P)-invariant injection

Ω:IBr(NG(P))IBr(G)\Omega:\operatorname{IBr}(\operatorname{N}_G(P))\hookrightarrow\operatorname{IBr}(G)

such that

(Aχ,G,χ)c(MNA(P)ϑ,M,ϑ)(A_\chi,G,\chi)\succeq_c(M\operatorname{N}_A(P)_\vartheta,M,\vartheta)

for every ϑIBr(NG(P))\vartheta\in\operatorname{IBr}(\operatorname{N}_G(P)) and χ=Ω(ψ)\chi=\Omega(\psi). This is the block-free version of the inductive Alperin-bound condition and is used to reduce the corresponding problem to finite simple groups. The supplied text does not establish the conjecture in general.

Sources & referencesView supporting material

Primary source

Zhicheng Feng, J. Miquel Martínez and Damiano Rossi, “Alperin's bound and normal Sylow subgroups”, arXiv:2502.12841 (2025).

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