The noncongruence-surjection conjecture for finite simple groups
The noncongruence-surjection conjecture for finite simple groups
Let be the free group of rank , let be a nonabelian finite simple group, and let be a surjection. Denote by the stabilizer of the corresponding point under the relevant action.
Noncongruence-surjection conjecture. If is a nonabelian finite simple group, then there exists a surjection such that is noncongruence. Equivalently, the kernel of the action on is noncongruence.
This is proposed as a weakening of an earlier conjecture after the paper finds many noncongruence surjections and infinitely many counterexamples to that earlier statement. The proposed weakening remains open in the supplied text.
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Sources & referencesView supporting material
Primary source
William Y. Chen, Alex Lubotzky and Pham Huu Tiep, “Finite simple characteristic quotients of the free group of rank 2”, arXiv:2308.14302 (2023).
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