Zero-full Hausdorff-measure conjecture for independent prime divisors

Let C(b,D)C(b,D) be a generalized Cantor set with Hausdorff dimension cgammacgamma, with DD containing at least one of 00 and b1b-1. Let t2t\geq 2 be an integer such that the sets of prime divisors of bb and tt are different. Let ff be a dimension function such that rγf(r)r^{-\gamma}f(r) is monotonic, and let cpsi:N(0,)cpsi:\mathbb{N}\to(0,\infty) be a function. Independent-prime-divisor zero-full law conjecture.

Hf(Wt(ψ)C(b,D))={0,if n=1f(ψ(n))tnψ(n)1γ<,Hf(C(b,D)),if n=1f(ψ(n))tnψ(n)1γ=.\mathcal{H}^{f}(W_t(\psi)\cap C(b,D))= \begin{cases} 0,&\text{if }\displaystyle\sum_{n=1}^{\infty}f(\psi(n))t^n\psi(n)^{1-\gamma}<\infty,\\\\ \mathcal{H}^{f}(C(b,D)),&\text{if }\displaystyle\sum_{n=1}^{\infty}f(\psi(n))t^n\psi(n)^{1-\gamma}=\infty. \end{cases}

The conjecture is based on a heuristic that the points with denominators tnt^n are distributed randomly relative to the bb-adic intervals intersecting the Cantor set. It would extend zero-full laws to the case where bb and tt have different prime divisors.

Sources & referencesView supporting material

Primary source

Bing Li, Ruofan Li and Yufeng Wu, “Zero-full law for well approximable sets in missing digit sets”, arXiv:2302.03936 (2024).

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