Problem detail · source-aware
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Let $n_1<n_2<\cdots$ be a lacunary sequence of integers and $f\in L^2([0,1])$ with $n$th Fourier partial sum $f_n$. Is there an absolute constant $C>0$ such that if $\| f-f_n\|_2 \ll (\log\log\log n)^{-C}$ then $\frac{1}{N}\sum_{k\leq N}f(\{\alpha n_k\})\to\int_0^1 f$ for almost every $\alpha$? A preprint answers this negatively via a dyadic spike-block counterexample.
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Provider: OpenAI · Prompt public: unknown · Independence: unknown
An arXiv preprint with no independent review yet; erdosproblems.com still lists the problem open.
Correctness: unknown · statement fidelity: unaudited · peer review: none
Answered negatively in a preprint that also settles the p=2 case of problem #995; erdosproblems.com still lists the problem open
Source-reported tools: construction.
Independent: unknown · difference confidence: 0
VibeMath has not independently audited the mathematical statement, proof, or novelty claim.