2503.22242
TRIMMED ERGODIC SUMS FOR NON-INTEGRABLE FUNCTIONS WITH POWER SINGULARITIES OVER IRRATIONAL ROTATIONS
M. Auer, T. I. Schindler
correcthigh confidence
- Category
- Not specified
- Journal tier
- Strong Field
- Processed
- Sep 28, 2025, 12:56 AM
- arXiv Links
- Abstract ↗PDF ↗
Audit review
The paper proves, in full detail, that for f(x)=x^{-β} with β>1 and a monotone trimming sequence k(N)=o(N), the following are equivalent: a uniform trimmed strong law, a trimmed weak law, and the arithmetic condition k(N)/max(b_n, max_{j≤n−1} a_j)→∞, with the normalization d_N=(β−1)^{-1}N^β k(N)^{1−β} (Theorem 12). The candidate solution states exactly this theorem and gives a different proof outline based on a uniform control of order statistics via the three-gap/Sturmian structure, plus a Riemann-sum comparison and a cluster argument for necessity. The paper’s proof is rigorous and complete; the model’s approach is plausible but leaves its key uniform order-statistic lemma as a sketch. Hence both are correct, using different proof strategies, with the paper providing full details.
Referee report (LaTeX)
\textbf{Recommendation:} minor revisions \textbf{Journal Tier:} strong field \textbf{Justification:} The work establishes trimmed weak and strong laws for non-integrable observables over irrational rotations with sharp arithmetic conditions, filling a gap beyond mixing systems. The proofs are careful and complete, and the results should be of broad interest in ergodic theory and probability. Some expository refinements would improve accessibility, but the mathematics appears sound.