The picky Evseev condition

From papers

Let GG be a finite group, let pp be a prime, let PSylp(G)P\in\operatorname{Syl}_p(G), let H=NG(P)H=\mathbf{N}_G(P), and let P\mathcal P be the set of picky elements of PP. Define CpP(H)\mathcal C_p^{\mathcal P}(H) as the integer span of irreducible characters in IrrP(H)\operatorname{Irr}^{\mathcal P}(H) whose degrees are divisible by pp. The picky Evseev condition. There exists a signed bijection

F:±IrrP(G)±IrrP(H)F:\pm\operatorname{Irr}^{\mathcal P}(G)\to\pm\operatorname{Irr}^{\mathcal P}(H)

such that F(χ)(1)p=χ(1)pF(\chi)(1)_p=\chi(1)_p and

F(χ)χHCpP(H)+I(H,P,S(G,P,H))F(\chi)-\chi_H\in\mathcal C_p^{\mathcal P}(H)+I(H,P,S(G,P,H))

for every χ±IrrP(G)\chi\in\pm\operatorname{Irr}^{\mathcal P}(G). This is formulated as a strengthening or analogue of Evseev's condition for the characters detected by picky elements; its general status is open in the supplied text.

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Sources & referencesView supporting material

Primary source

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

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