Algorithmic radical-boundedness conjecture for word maps

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.

Sources & referencesView supporting material

Primary source

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

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