The Hall-picky local-global conjecture

Let GG be a finite group, let π\pi be a set of primes, and let HH be a nilpotent Hall π\pi-subgroup of GG. Let H\mathcal H be the set of elements of HH that are HH-picky, meaning that whenever xHgx\in H^g, one has gNG(H)g\in\mathbf{N}_G(H). The Hall-picky local-global conjecture. There exists a bijection

f:IrrH(G)IrrH(NG(H))f:\operatorname{Irr}^{\mathcal H}(G)\longrightarrow \operatorname{Irr}^{\mathcal H}(\mathbf{N}_G(H))

such that it preserves π\pi-parts of degrees, fields of character values at every xHx\in\mathcal H, and the subsets of characters nonzero at each such xx. This proposes the appropriate Hall-subgroup analogue of the picky conjecture after the naive π\pi-McKay counting statement fails; its status is open.

Sources & referencesView supporting material

Primary source

Alexander Moretó, “Alperin's Main Problem of Block Theory”, arXiv:2605.11988 (2026).

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