Algorithmic radical-boundedness conjecture for word maps

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Let ww be a reduced word. For a finite group GG, let Rad⁡(G)\operatorname{Rad}(G) be its solvable radical, and let pw(G)\mathfrak{p}_w(G) denote the probability that the word map associated with ww takes a prescribed value as defined in the source.

Algorithmic radical-boundedness conjecture. There exists an algorithm which, on input ww, decides whether there is a function

gw:(0,1]→[1,∞)g_w:(0,1]\rightarrow[1,\infty)

such that, for every finite group GG and every ρ∈(0,1]\rho\in(0,1], the implication

pw(G)≥ρ⟹[G:Rad⁡(G)]≤gw(ρ)\mathfrak{p}_w(G)\geq\rho\quad\Longrightarrow\quad [G:\operatorname{Rad}(G)]\leq g_w(\rho)

holds. If such a function exists, the algorithm also outputs a definition of one possible choice of gwg_w.

The claim would give an algorithmic way to determine whether a lower bound on word-map probability controls the nonsolvable part of every finite group. The source explains that this statement follows if the effective Larsen–Shalev conjecture holds.

References

Primary source

Alexander Bors, “Fibers of automorphic word maps and an application to composition factors”, arXiv:1608.00131 (2016).

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