Nonabelian Cohen–Lenstra distribution conjecture for pro-prime-to-roots-of-unity class groups
Let or , and let be the group of roots of unity contained in . Let be the finite group and the cyclic subgroup governing the extensions under consideration. As varies over -extensions of , consider the pro-prime-to- completion of . For an admissible -group with and , let its -moment be the expected number of -equivariant surjections onto . Nonabelian Cohen–Lenstra conjecture. The distribution of the pro-prime-to- completion of is predicted by the probability measure defined by the random group model. Moreover, the -moment of the distribution of is
This is the main conjectural extension of the Cohen–Lenstra heuristics to nonabelian admissible -groups. The source gives no evidence that the distribution statement or the stated moments are resolved in the generality claimed.
References
Primary source
Yuan Liu and Ken Willyard, “The imaginary case of the nonabelian Cohen–Lenstra heuristics”, arXiv:2507.21558 (2025).
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