Rapid generation conjecture for finite simple Lie algebras

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Let g⁡\operatorname{\mathfrak{g}} be a Lie algebra over Fp\mathbf{F}_p. For subsets X,Y⊆g⁡X,Y\subseteq \operatorname{\mathfrak{g}}, define

X+Y={x+y∣x∈X, y∈Y},[X,Y]={[x,y]∣x∈X, y∈Y}.X+Y=\{x+y\mid x\in X,\ y\in Y\},\qquad [X,Y]=\{[x,y]\mid x\in X,\ y\in Y\}.

For a generating set AA of g⁡\operatorname{\mathfrak{g}}, define A1={0}∪AA^1=\{0\}\cup A and, for k≥2k\geq 2,

Ak=⋃0<j<k((Aj+Ak−j)∪[Aj,Ak−j]).A^k=\bigcup_{0<j<k}\bigl((A^j+A^{k-j})\cup[A^j,A^{k-j}]\bigr).

The diameter diam⁡(g⁡,A)\operatorname{diam}(\operatorname{\mathfrak{g}},A) is the least kk such that Ak=g⁡A^k=\operatorname{\mathfrak{g}}.

Rapid generation conjecture. There exist absolute constants C,DC,D such that, for every nonabelian finite simple Lie algebra g⁡\operatorname{\mathfrak{g}} over Fp\mathbf{F}_p and every generating set AA of g⁡\operatorname{\mathfrak{g}},

diam⁡(g⁡,A)≤C(log⁡∣g⁡∣)D.\operatorname{diam}(\operatorname{\mathfrak{g}},A)\leq C(\log|\operatorname{\mathfrak{g}}|)^D.

This is presented as the linear analogue of Babai's conjecture for finite simple groups. The supplied text does not establish whether it is open or resolved; the paper's surrounding results provide explicit diameter bounds but do not, in the supplied span, identify this exact assertion as proved.

References

Primary source

Marco Barbieri, Urban Jezernik and Matevž Miščič, “Diameter bounds for finite simple Lie algebras”, arXiv:2509.15351 (2026).

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