The codegree isomorphism conjecture for finite simple groups

Let GG be a finite group. For an irreducible character χ\chi of GG, define its codegree by

cod(χ)=G:ker(χ)χ(1).\operatorname{cod}(\chi)=\frac{|G:\operatorname{ker}(\chi)|}{\chi(1)}.

Let cod(G)\operatorname{cod}(G) denote the set of codegrees of irreducible characters of GG.

The codegree isomorphism conjecture. Let HH be a finite nonabelian simple group and GG a finite group. Then

cod(G)cod(H)if and only ifGH.\operatorname{cod}(G)\subseteq\operatorname{cod}(H)\quad\text{if and only if}\quad G\cong H.

This is proposed as a stronger version of the codegree isomorphism conjecture, whose equality hypothesis has been confirmed for several families of simple groups. The supplied text does not give a resolution of the stronger version.

Sources & referencesView supporting material

Primary source

Nguyen N. Hung and Alexander Moretó, “The codegree isomorphism problem for finite simple groups II”, arXiv:2406.10398 (2024).

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